Double coaxial crimping type closed Faraday probe

Abstract

The invention provides a double coaxial crimping type closed Faraday probe, and relates to the technical field of electric propulsion, a connecting nut is in threaded connection with a threaded section of a collector component, detachable connection of the collector component, a protection component and a support ring component is realized, the damaged or polluted collector component and the protection component are freely replaced, and the disassembly and assembly are more convenient; the ceramic ring is additionally arranged between the collector and the protection ring, so that beam current generated by the electric thruster is prevented from passing through a gap between the collector and the protection ring, and ions are prevented from being collected on the side surface of the collector; the metal jacket is used for totally sealing the wiring part, so that clutter signals cannot be collected due to the fact that the wiring part is exposed in a plasma environment, sparking with other metal objects in an experimental environment due to charge accumulation caused by exposed wiring is avoided, and the accuracy of the probe is improved; the technical problems that in the prior art, a traditional double coaxial crimping type closed Faraday probe is complex in assembly and disassembly, complex in later maintenance and inaccurate in measured data are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric propulsion, and in particular to a dual-coaxial crimped closed Faraday probe. Background Art

[0002] Electric thrusters generate thrust by ionizing a working fluid to create a plasma and accelerating it using electromagnetic fields. Compared to traditional chemical thrusters, they offer higher specific impulse and significantly reduce the required propellant mass. Therefore, electric thrusters demonstrate great potential for 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 evaluated using both contact and non-contact diagnostic techniques. Dual coaxial press-fit closed Faraday probes, as a contact diagnostic tool, are widely used to measure the ion current density in the plasma plume, thereby calculating key thruster parameters such as ion current and beam divergence.

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

[0005] However, the existing dual coaxial press-fit closed Faraday probe has the following problems: 1. Currently, the assembly and disassembly of probes with simple appearance are relatively complicated, and the subsequent maintenance is relatively complicated; while the probes that are easier to assemble and disassemble are generally in the shape of a damaged cylinder, which has great interference to the measurement field and poor electromagnetic shielding effect.

[0006] 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 the collection of ions. Although correction factors can be used to make some corrections, the resulting inflated measurement data cannot be eliminated. 3. Existing dual-coaxial crimped closed Faraday probe wiring mainly uses exposed tail and side wiring. These methods cannot prevent the exposed wiring from collecting ions or electrons, making the data measured by the dual-coaxial crimped closed Faraday probe inaccurate and containing noise signals. Summary of the Invention

[0007] The purpose of the present invention is to provide a dual coaxial crimped closed Faraday probe to alleviate the technical problems existing in the prior art of the traditional dual coaxial crimped closed Faraday probe, such as complicated assembly and disassembly, complicated subsequent maintenance, and inaccurate measured data.

[0008] The dual coaxial crimped closed Faraday probe provided by the present invention comprises: a collector component, a protective component, a support ring component, a connecting nut and a metal jacket; One end of the collector member extends into the metal jacket, and the other end of the collector member extends out of the metal jacket and is detachably connected to the support ring member; One end surface of the support ring component is connected to the protection component, and the other end surface of the support ring component extends into the metal jacket; The portion of the collector member extending into the metal jacket is provided with a threaded section, the connecting nut is threadedly connected to the threaded section, and the connecting nut can abut against the end surface of the support ring member; The end surface of the protection component facing the support ring component can fix one coaxial shielded wire, and the threaded section can fix another coaxial shielded wire.

[0009] In an alternative embodiment, The collector component includes a collector front end and a collector rear end; One end of the rear end of the collector extends into the metal jacket, and the other end of the rear end of the collector extends out of the metal jacket; The front end of the collector and the rear end of the collector away from the metal jacket are detachably connected.

[0010] In an alternative embodiment, The rear end of the collector includes a first connecting portion, a second connecting portion and a step portion; Both end surfaces of the step portion are connected to the first connecting portion and the second connecting portion respectively; The second connecting portion is provided with the threaded section; The front end of the collector is provided with a slot, and the first connecting portion extends into the slot.

[0011] In an alternative embodiment, The protection member includes a ceramic ring and a protection ring; The protective ring is sleeved on the ceramic ring, and one end of the second connecting portion extending out of the metal outer sleeve passes through the protective ring and the ceramic ring in sequence; The step portion, the first connecting portion and the front end of the collector are all arranged in the ceramic ring.

[0012] In an alternative embodiment, The end surface of the protection ring close to the supporting ring component is provided with a groove, and the groove is used for fixing the coaxial shielding wire.

[0013] In an alternative embodiment, The support ring component includes a brim portion and an insert portion; The brim portion and the insertion portion are connected to each other, the brim portion is connected to the end surface of the metal jacket, and the insertion portion extends into the metal jacket.

[0014] In an alternative embodiment, The ceramic ring has a first central hole, the protection ring has a second central hole, and the support ring member has a third central hole; The second connecting portion passes through the third center hole, the second center hole and the first center hole in sequence in a direction of extending out of the metal outer sleeve.

[0015] In an alternative embodiment, The outer diameter of the step portion is larger than the aperture of the first center hole.

[0016] In an alternative embodiment, The support ring component has a socket, one end of which is opened on the end surface of the insertion part, and the other end of which is opened on the end surface of the brim part. The socket is used for allowing the coaxial shielded wire to pass through, so that the coaxial shielded wire can pass through the socket and extend into the groove.

[0017] In an alternative embodiment, The metal jacket includes a cylindrical portion and an outlet portion; The brim portion is connected to the end of the cylindrical portion, and the insertion portion extends into the cylindrical portion; The outlet portion is connected to one end of the cylindrical portion away from the brim portion, and the two coaxial shielded wires in the cylindrical portion pass through the outlet portion, and the coaxial shielded wires passing through the outlet portion are sealed by a heat shrink tube.

[0018] The dual-coaxial crimped closed Faraday probe provided by the present invention is threadedly connected to the threaded section of the collector component through a connecting nut, thereby realizing a detachable connection between the collector component, the protective component and the support ring component, and freely replacing damaged or contaminated collector components and protective components, making disassembly and assembly 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 by the side of the collector, thereby improving measurement accuracy; and a metal jacket is used to fully enclose the wiring point to prevent the wires at the wiring point from receiving stray ion pairs, while also shielding electromagnetic interference. No clutter signals will be collected due to the wiring point being exposed to the plasma environment, and no charge accumulation will be generated due to the exposed wiring, thereby preventing sparks from other metal objects in the experimental environment. The accuracy of the probe is improved, and the technical problems of the traditional dual-coaxial crimped closed Faraday probe in the prior art, such as the complexity of assembly and disassembly, the complexity of subsequent maintenance, and inaccurate measured data, are alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A cross-sectional view of the overall structure of a dual-coaxial crimped closed Faraday probe provided in an embodiment of the present invention; Figure 2 An exploded view of the overall structure of a dual-coaxial crimped closed Faraday probe provided in an embodiment of the present invention; Figure 3 A schematic diagram of the overall structure of a dual-coaxial crimped closed Faraday probe provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of the front end of the collector in a dual coaxial press-fit closed Faraday probe provided in an embodiment of the present invention; Figure 5 A schematic structural diagram of the rear end of the collector in a dual coaxial press-fit closed Faraday probe provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of a ceramic ring in a dual-coaxial press-fit closed Faraday probe provided in an embodiment of the present invention; Figure 7 A schematic structural diagram of a guard ring in a dual-coaxial crimped closed Faraday probe provided by an embodiment of the present invention; Figure 8 A schematic structural diagram of a support ring component in a dual-coaxial press-fit closed Faraday probe provided by an embodiment of the present invention; Figure 9 A schematic structural diagram of a metal jacket in a dual-coaxial crimped closed Faraday probe provided in an embodiment of the present invention.

[0021] Icons: 100-collector component; 110-collector front end; 111-slot; 120-collector rear end; 121-first connecting part; 122-second connecting part; 123-step 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 brim; 320-insertion part; 330-third center hole; 340-socket; 400-connecting nut; 500-metal jacket; 510-cylinder part; 520-outlet part. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present 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.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1、 Figure 2 、 Figure 3 As shown, the dual coaxial crimped closed 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 part 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 a coaxial shielded wire, and the threaded section 130 can fix another coaxial shielded wire, thereby realizing dual coaxial fully closed wiring.

[0027] The dual-coaxial crimped closed Faraday probe provided in this embodiment is threadedly connected to the threaded section 130 of the collector component 100 through the connecting nut 400, thereby realizing a detachable connection between the collector component 100, the protective component 200 and the support ring component 300, and freely replacing damaged or contaminated collector components 100 and protective components 200, making assembly and disassembly more convenient. The metal jacket 500 is used to fully seal the wiring connection, which can minimize the impact of electromagnetic interference on the diagnostic results. At the same time, the probe will not collect clutter signals due to the rear-end wiring connection being exposed to the plasma environment, nor will it cause sparks with other metal objects in the experimental environment due to charge accumulation caused by the exposed wiring, thereby improving the accuracy of the probe and alleviating the technical problems of the traditional dual-coaxial crimped closed Faraday probe in the prior art, such as the complex assembly and disassembly, complex later maintenance, and inaccurate measured data.

[0028] Regarding the structure and shape of the collector member 100, specifically: 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, and the other end of the collector rear end 120 extends out of the metal jacket 500, and the collector front end 110 and the collector rear end 120 are detachably connected to one end away from the metal jacket 500.

[0029] 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 and second connecting portions 121, 122. The outer diameter of the stepped portion 123 is larger than both the outer diameters of the first and second connecting portions 121, 122. The two end surfaces of the stepped portion 123 are connected to the first and second connecting portions 121, 122, respectively. The first and second connecting portions 121, 122, and stepped portion 123 are integrally formed, and a threaded section 130 is provided on the second connecting portion 122.

[0030] The front end 110 of the collector has a slot 111 , the first connecting portion 121 extends into the slot 111 , and the outer wall of the first connecting portion 121 is frictionally connected to the slot wall of the slot 111 .

[0031] Regarding the structure and shape of the protection member 200, specifically: like Figure 6 、 Figure 7 As shown, the protection component 200 includes a ceramic ring 210 and a protection ring 220; the protection ring 220 is a cylindrical structure with one end open and the other end closed, and the end close to the support ring component 300 is a closed surface, and a second center hole 222 is opened in the center of the closed surface. The shape of the ceramic ring 210 is similar to that of the protection ring 220. The ceramic ring 210 is placed in the protection ring 220, and the step portion 123, the first connecting portion 121 and the collector front end 110 are all arranged in the ceramic ring 210. A first center hole 211 is opened in the center of the ceramic ring 210, and a third center hole 330 is opened in the center of the support ring component 300. The second connecting portion 122 passes through the third center hole 330, the second center hole 222 and the first center hole 211 in sequence in the direction of extending out of the metal jacket 500.

[0032] In an optional embodiment, the outer diameter of the step portion 123 is larger than the aperture size of the first center hole 211, so that the step portion 123 cannot pass through the first center hole 211, limiting the movement direction of the step portion 123, and the step surface is friction-fitted with the groove wall of the ceramic ring 210. The outer wall of the collector front end 110 is friction-fitted with the inner wall of the ceramic ring 210, and the outer wall of the ceramic ring 210 is friction-fitted with the inner wall of the protective ring 220.

[0033] In an optional embodiment, a groove 221 is provided on the end face of the protective ring 220 close to the support ring member 300. The groove 221 is in a circular shape 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 it is ensured that the coaxial shielding wire will not be higher than the end face of the protective ring 220 close to the support ring, so that the side of the probe is closed.

[0034] The material of the protection ring 220 is 304 stainless steel, the material of the collector rear end 120 is copper, the material of the collector front end 110 is tungsten or other high melting point metals, and the insulating ceramic material of the collector protection ring 220 is boron nitride ceramic.

[0035] Regarding the structure and shape of the support ring member 300, specifically: like Figure 8 As shown, the support ring component 300 is made of ceramic material as a whole, and 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, and 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.

[0036] The support ring component 300 is also provided with a socket 340, one end opening of the socket 340 is set on the end face of the insertion part 320, and the other end opening of the socket 340 is set on the end face of the brim 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 can pass through the socket 340 and extend into the groove 221.

[0037] Regarding the structure and shape of the metal jacket 500, specifically: like Figure 9 As 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. The two coaxial shielded wires in the cylindrical portion 510 pass through the outlet portion 520, and the coaxial shielded wires passing through the outlet portion 520 are sealed by a heat shrink tube.

[0038] Based on the above, in general, the present invention uses coaxial matching, with the rear end 120 of the collector as the axis, and coaxially inserts the front end 110 of the collector into its front end, and sequentially inserts the ceramic ring 210, the protective ring 220, and the support ring component 300 into its rear end, passes the coaxial shielding wire through the jack 340, and the core wire is stripped out, wrapped around the ring and inserted into the groove 221, and another coaxial shielding wire is wrapped around the threaded section 130 of the rear end 120 of the collector, and then the standard connecting nut 400 is used to tighten the entire front structure along the thread, and the two coaxial shielding wires are passed through the tail outlet 520 of the metal jacket 500, and the cylindrical part 510 is sleeved on the cylindrical side of the support ring component 300, and finally, the coaxial shielding wire is passed through the hole of the outlet 520 of the metal jacket 500 and sealed with a heat shrink tube.

[0039] The method for replacing the collector of the present invention: Unplug the metal jacket 500, loosen the standard connecting nut 400 by hand, pull out the support ring component 300, the protective ring 220 and the connected coaxial shielding wire together, pull out the damaged or contaminated collector front end 110 and the ceramic ring 210, replace them with another new collector front end 110 and ceramic ring 210, install the support ring component 300, the protective ring 220 and the connected coaxial shielding wire assembly, use a standard nut to tighten the front structure along the thread, put on the metal jacket 500 and use a heat shrink tube to seal the tail again, and finish.

[0040] The method for using the dual coaxial crimped closed Faraday probe of the present invention is as follows: 1. Use the wiring method described above to complete the probe wiring and lead out, and connect the lead wire to the circuit: the guard ring 220 is connected to a -30V bias, and a DC constant voltage power supply can be used for power supply. The collector is connected to the source meter, and the source meter is set to add a -30V bias to the collector and can collect the current on the collector.

[0041] 2. Fix the dual coaxial press-fit closed Faraday probe on the rotating platform, regard the thruster center axis as 0 degrees, perform a rotation scan at a constant speed, and use the source meter to start collecting current and recording data.

[0042] In order to address the cleanliness issues of the probe surface and the ceramic surface, in the present invention, the collector and other parts of the dual-coaxial crimped closed Faraday probe are designed as a split structure to ensure easy maintenance. If it is found that the front end 110 of the collector is contaminated, rusted or covered, and there is a metal deposition film on the support ring component 300, both can be directly replaced, which greatly saves costs.

[0043] In order to improve the sealing performance 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 portion 520 of the tail shrinkage structure. After the probe is assembled, the wire should be sealed with a heat shrink tube after passing through the hole at the tail of the metal jacket 500, so that the wiring terminal will not be exposed to the plasma environment.

[0044] The present invention digs out a wiring groove 221 at the rear end of the protective ring 220, and at the same time opens a hole on the support ring component 300, so that the wiring becomes a dual coaxial method, so that the part of the probe in the plasma environment has a regular cylindrical shape, which has a simple appearance and little damage to the plume field; the present invention uses the ceramic ring 210 to fill the gap between the collector and the protective ring 220, thereby achieving physical isolation of low-energy ions entering the collector from the side, thereby improving measurement accuracy.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 crimped closed Faraday probe, characterized in that: include: A collector member (100), a protective member (200), a support ring member (300), a connecting nut (400) and a metal jacket (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 surface of the support ring component (300) is connected to the protective component (200), and the other end surface 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), the connecting nut (400) is threadedly connected to the threaded section (130), and the connecting nut (400) is capable of abutting against the end surface of the support ring component (300); The end surface of the protective component (200) facing the supporting ring component (300) can fix a coaxial shielded wire, and the threaded section (130) can fix another coaxial shielded wire.

2. The dual coaxial crimped closed Faraday probe according to claim 1, characterized in that: The collector component (100) comprises 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 collector front end (110) and the collector rear end (120) are detachably connected to one end away from the metal jacket (500).

3. The dual coaxial crimped closed Faraday probe according to claim 2, characterized in that: The collector rear end (120) comprises a first connecting portion (121), a second connecting portion (122) and a step portion (123); Both end surfaces of the step portion (123) are respectively connected to the first connecting portion (121) and the second connecting portion (122); The second connecting portion (122) is provided with the threaded section (130); The collector front end (110) has a slot (111), and the first connecting portion (121) extends into the slot (111).

4. The dual coaxial crimped closed Faraday probe according to claim 3, characterized in that: The protective component (200) comprises a ceramic ring (210) and a protective ring (220); The protective ring (220) is sleeved on the ceramic ring (210), and one end of the second connecting portion (122) extending out of the metal outer sleeve (500) passes through the protective ring (220) and the ceramic ring (210) in sequence; The step portion (123), the first connecting portion (121) and the collector front end (110) are all arranged in the ceramic ring (210).

5. The dual coaxial crimped closed Faraday probe according to claim 4, characterized in that: The end surface of the protection ring (220) close to the support ring component (300) is provided with a groove (221), and the groove (221) is used to fix the coaxial shielding wire.

6. The dual coaxial crimped closed Faraday probe according to claim 5, characterized in that: The support ring component (300) comprises a brim portion (310) and an insert 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), and the insertion portion (320) extends into the metal jacket (500).

7. The dual coaxial crimped closed Faraday probe according to claim 6, 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 component (300) has a third central hole (330); The second connecting portion (122) passes through the third center hole (330), the second center hole (222), and the first center hole (211) in sequence in a direction extending out of the metal jacket (500).

8. The dual coaxial crimped closed Faraday probe according to claim 7, characterized in that: The outer diameter of the step portion (123) is larger than the aperture of the first central hole (211).

9. The dual coaxial crimped closed Faraday probe according to claim 6, characterized in that: The support ring component (300) has a socket (340), one end opening of the socket (340) is arranged on the end surface of the insertion portion (320), and the other end opening of the socket (340) is arranged on the end surface of the brim portion (310). The socket (340) is used for allowing the coaxial shielded wire to pass through, so that the coaxial shielded wire passes through the socket (340) and then extends into the groove (221).

10. The dual coaxial crimped closed Faraday probe according to claim 6, characterized in that: The metal jacket (500) comprises 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 portion (520) is connected to an end of the cylindrical portion (510) away from the brim portion (310), and the two coaxial shielded wires in the cylindrical portion (510) pass through the outlet portion (520), and the coaxial shielded wires passing through the outlet portion (520) are sealed by a heat shrink tube.

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