An ionization chamber type liquid level detection device suitable for a variety of highly radioactive media

Abstract

This invention belongs to the field of liquid level measurement technology for containers or pipelines containing highly radioactive media, and relates to an ionization chamber type liquid level detection device suitable for various highly radioactive media. The device includes a multi-electrode ionization chamber detector, a collimating shield, and a pre-processing unit. This invention guides the radiation emitted by the highly radioactive media into the housing through multiple collimating windows. This ionizes the inert gas in each detection sensitive area, generating charged particles. The high-voltage electric field in each detection sensitive area drives the particles to move to the corresponding collecting electrode. The collecting electrode captures the charged particles and generates an ionization signal, which is sent to the pre-processing unit. The pre-processing unit determines the liquid level height of the corresponding highly radioactive media based on the varying ionization strength signals generated by the ionized inert gas caused by the different radiation intensity emitted by the various highly radioactive media. This allows for the simultaneous identification and location of multiple coexisting highly radioactive media under non-contact conditions.

Description

Technical Field

[0001] This invention belongs to the field of liquid level measurement technology for containers or pipelines containing highly radioactive media, and relates to an ionization chamber type liquid level detection device suitable for various highly radioactive media. Background Technology

[0002] In highly radioactive environments such as nuclear fuel reprocessing, critical systems in nuclear power plants, and nuclear medicine, the measurement of fluid media within closed process tanks or pipelines often involves high temperatures, high pressures, and strong corrosiveness. These media may coexist in multiple forms, including deposited solids, liquids, foams, and vapors, and are generally subjected to inaccessible and harsh radiation conditions. To achieve effective monitoring of liquid levels or interface positions, devices such as differential pressure transmitters, capacitive level gauges, float level gauges, ultrasonic level gauges, and guided wave radar level gauges are commonly used. Differential pressure transmitters reflect liquid level height by detecting changes in static pressure; capacitive and float level gauges rely on the difference in physical properties between the medium and the measuring element for sensing; while ultrasonic and guided wave radar level gauges can complete measurements without direct contact with the medium, improving system safety and maintainability to a certain extent. These technologies have achieved relatively stable applications in some single-medium, low-complexity scenarios.

[0003] However, existing measurement methods face significant limitations when multiple media, such as sedimentary solids, liquids, foams, and vapors, are present simultaneously within a container. Contact-type instruments, such as differential pressure transmitters, are prone to failure due to blockage or leakage in the guide tube; capacitive and float-type level gauges suffer from insufficient long-term reliability due to component contamination and irradiation aging. Among non-contact methods, ultrasonic level gauges are susceptible to interference from the strong absorption characteristics of foam, resulting in severe signal attenuation and an inability to penetrate multiphase regions. Guided wave radar also struggles to distinguish interfaces between media with similar dielectric constants, and both methods pose a risk of electronic component performance degradation under continuous high-dose radiation. More importantly, there is currently no measurement device capable of simultaneously identifying and locating multiple coexisting media under non-contact conditions, making it difficult to acquire interface information under complex operating conditions and hindering the improvement of safety monitoring and automation control levels in the process. Summary of the Invention

[0004] The purpose of this invention is to provide an ionization chamber type liquid level detection device suitable for various highly radioactive media, which can simultaneously identify and locate multiple coexisting highly radioactive media under non-contact conditions, avoiding the difficulty of obtaining interface information under complex working conditions.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] An ionization chamber type liquid level detection device suitable for various highly radioactive media, comprising:

[0007] The multi-electrode ionization chamber detector includes a vertically arranged shell, two high-voltage support bases, multiple horizontally arranged collecting electrodes, and a high-voltage electrode horizontally arranged between two adjacent collecting electrodes. The two high-voltage support bases are horizontally arranged inside the shell, and the multiple collecting electrodes are arranged between the two high-voltage support bases and uniformly arranged in the vertical direction. The shell contains an inert gas at a preset pressure. The radiation released by the highly radioactive medium ionizes the inert gas to generate charged particles. The two high-voltage support bases and the multiple high-voltage electrodes are all connected to a high-voltage power supply and are interconnected. Each collecting electrode generates an ionization signal after capturing charged particles.

[0008] The collimating shield is a box-shaped structure that is fitted onto the outside of the shell. A collimating window is horizontally opened near each collecting electrode plate of the collimating shield, through which the rays emitted by the highly radioactive medium enter the interior of the shell.

[0009] The front-end data processing unit is electrically connected to multiple collecting plates and is used to receive ionization signals from multiple collecting plates. Based on the different intensities of radiation emitted by different highly radioactive media, the ionization signals generated by the ionized inert gas are also different, so as to determine the liquid level height of the corresponding highly radioactive medium.

[0010] The invention is further characterized by:

[0011] Two high-voltage support bases and multiple high-voltage plates are arranged at equal intervals along the vertical direction, and the distance between each high-voltage plate and the two adjacent collecting plates is equal.

[0012] The distance between each high-voltage electrode and the adjacent collecting electrode is 11mm to 14mm.

[0013] The inert gas consists of nitrogen and argon.

[0014] Nitrogen accounts for 85% to 95% of the volume, and argon accounts for 5% to 15%.

[0015] The preset pressure of the inert gas is 0.8MPa~1.2MPa.

[0016] The housing contains multiple high-voltage positioning shafts vertically arranged inside, evenly distributed around multiple high-voltage electrode plates. Each high-voltage positioning shaft is fixedly connected to a high-voltage support base at both ends and to each high-voltage electrode plate. A central fixing shaft is vertically arranged inside the housing, located between the multiple high-voltage positioning shafts. The two ends of the central fixing shaft pass through two high-voltage support bases, and the lower end of the central fixing shaft is fixedly connected to the bottom of the housing. The central fixing shaft passes through each high-voltage electrode plate and each collecting electrode plate, and is fixedly connected to each collecting electrode plate.

[0017] Each high-voltage support seat has an insulating seat on the side away from the central fixed axis, and the insulating seat is fixedly connected to the corresponding high-voltage support seat and the inner wall of the housing.

[0018] A pressure-bearing adapter cover is provided inside the housing near the upper end of the central fixed shaft. The pressure-bearing adapter cover is fixedly connected to the inner wall of the housing and the upper end of the central fixed shaft, so that the pressure-bearing adapter cover and the area inside the housing near the central fixed shaft form a pressure-resistant ionization cavity. An air inlet is provided on the pressure-bearing adapter cover, and the air inlet is connected to the pressure-resistant ionization cavity.

[0019] Multiple signal insulators are installed on the side of the pressure-bearing adapter cover away from the central fixed axis. Two high-voltage support seats and multiple high-voltage plates form a high-voltage pole, which is electrically connected to one of the signal insulators. The remaining signal insulators correspond one-to-one with multiple collection plates, and each collection plate is electrically connected to the corresponding signal insulator. An airtight connector is installed on the upper part of the housing, which is electrically connected to multiple signal insulators and the front-end data processing unit.

[0020] The ionization chamber type liquid level detection device of the present invention, suitable for various highly radioactive media, has the following advantages:

[0021] This invention guides the rays emitted by a highly radioactive medium into the interior of the casing through multiple collimation windows. This ionizes the inert gas in each detection sensitive area, generating charged particles. The high-voltage electric field in each sensitive area drives the particles to their corresponding collection plates. Once captured, the collection plates generate ionization signals, which are sent to a pre-processing unit. The pre-processing unit determines the liquid level of the corresponding highly radioactive medium based on the varying ionization strengths of the ionized inert gas generated by the different intensities of the rays emitted by the various highly radioactive media. This allows for the simultaneous identification and location of multiple coexisting highly radioactive substances under non-contact conditions, avoiding the difficulty of obtaining interface information in complex operating conditions and promoting improved safety monitoring and automation control of the process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a cross-sectional view of the multi-polar ionization chamber detector in this invention.

[0024] Figure 3 This is a cross-sectional view of the collimating shield in this invention.

[0025] Figure 4 This is a schematic diagram of the multi-media measurement method of the present invention.

[0026] Figure label:

[0027] 1. Multipolar ionization chamber detector; 2. Pre-processing unit; 3. Collimation shield; 4. Multi-core radiation-resistant shielded cable; 5. Mounting bracket; 6. Container under test; 11. Housing; 12. Sealing cover; 13. Airtight connector; 14. Pressure-bearing adapter cover; 15. High-voltage electrode plate; 16. High-voltage positioning shaft; 17. High-voltage support base; 18. Collecting electrode plate; 19. Central fixing shaft; 20. Insulating base; 21. Signal insulator; 22. Gas inlet; 23. Pressure-resistant ionization chamber; 31. Shielding material; 32. Shielding main body shell; 33. Shielding cover shell; 34. Collimation window. Detailed Implementation

[0028] The technical solutions of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments of the present invention, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] like Figure 1 , Figure 2 , Figure 3As shown, this invention provides an ionization chamber type liquid level detection device suitable for various highly radioactive media, including a multi-electrode ionization chamber detector 1, a collimating shield 3, and a pre-processing data unit 2. The multi-electrode ionization chamber detector 1 includes a vertically arranged shell 11, two high-voltage support bases 17, multiple horizontally arranged collecting electrodes 18, and a high-voltage electrode 15 horizontally arranged between two adjacent collecting electrodes 18. The two high-voltage support bases 17 are horizontally arranged inside the shell 11, and the multiple collecting electrodes 18 are arranged between the two high-voltage support bases 17 and uniformly arranged in the vertical direction. Each high-voltage electrode 15 is horizontally arranged between two adjacent collecting electrodes 18. The shell 11 stores an inert gas at a preset pressure. The two high-voltage support bases 17 and the multiple high-voltage electrodes 15 are all connected to a high-voltage power supply and are interconnected. The two high-voltage support bases 17 and the multiple high-voltage electrodes 15 divide the area inside the shell 11 between the two high-voltage support bases 17 into multiple detection sensitive areas in the vertical direction. The high-voltage power supply generates a uniform electric field in the multiple detection sensitive areas. Multiple detection sensitive zones correspond one-to-one with multiple collection plates 18, meaning each collection plate 18 is located within its corresponding detection sensitive zone. When the radiation emitted by the highly radioactive medium enters the detection sensitive zone, it ionizes the inert gas, generating charged particles. Each collection plate 18 captures these charged particles and generates an ionization signal. The collimating shield 3 is a box structure, fitted onto the outside of the housing 11. A collimating window 34 is horizontally opened near each collection plate 18 on the collimating shield 3. The radiation emitted by the highly radioactive medium enters the housing 11 through the collimating window 34. The collimating shield 3 prevents the radiation emitted by the highly radioactive medium from entering the housing 11 from other locations, thus avoiding affecting the accuracy of the ionization signal generated by each collection plate 18. The front-end data processing unit 2 is electrically connected to the multiple collection plates 18. The front-end data processing unit 2 receives the ionization signals from the multiple collection plates 18. Based on the different intensities of the radiation emitted by different highly radioactive media, the ionization signals generated by the ionized inert gas vary, thus determining the liquid level height of the corresponding highly radioactive medium. This invention guides the rays emitted by a highly radioactive medium into the interior of the housing 11 through multiple collimation windows 34. This ionizes the inert gas in each detection sensitive area, generating charged particles. The high-voltage electric field in each detection sensitive area drives the particles to the corresponding collecting plate 18. The collecting plate 18 captures the charged particles and generates an ionization signal, which is sent to the pre-processing unit 2. The pre-processing unit 2 determines the liquid level of the corresponding highly radioactive medium based on the varying ionization strength signals generated by the ionized inert gas from the different rays emitted by the highly radioactive medium. This enables the simultaneous identification and location of multiple coexisting highly radioactive substances under non-contact conditions, avoiding the difficulty of obtaining interface information in complex working conditions and promoting the improvement of safety monitoring and automation control levels in the process.

[0030] like Figure 2As shown, two high-voltage support bases 17 and multiple high-voltage plates 15 are arranged at equal intervals along the vertical direction. The distance between each high-voltage plate 15 and two adjacent collecting plates 18 is equal. By arranging the two high-voltage support bases 17 and multiple high-voltage plates 15 at equal intervals along the vertical direction and ensuring that each high-voltage plate 15 is precisely located at the center of two adjacent collecting plates 18, multiple detection sensitive areas with highly consistent geometric and electrical characteristics are constructed. This design not only ensures the comparability and stability of ionization signals from each channel, but also achieves high-precision, anti-interference, and non-contact layered positioning of the interfaces of multiphase media such as deposited solids, liquids, foams, and vapors in highly radioactive containers. This fundamentally solves the technical problem that existing technologies cannot simultaneously obtain complete interface information under complex multiphase coexistence conditions.

[0031] The spacing between each high-voltage electrode 15 and the adjacent collecting electrode 18 is 11mm~14mm, which ensures efficient and low-loss collection of ionized charged particles under a typical working electric field, improves the response sensitivity and anti-interference ability to weak radiation signals, and matches the radiation attenuation characteristics of highly radioactive multiphase media, thus achieving high-resolution and high-confidence identification of the interface positions of each medium.

[0032] The inert gas consists of nitrogen and argon, and the preset pressure of the inert gas is 0.8MPa~1.2MPa.

[0033] Nitrogen accounts for 85% to 95% of the volume, while argon accounts for 5% to 15%.

[0034] like Figure 2 As shown, multiple high-voltage positioning shafts 16 are vertically arranged inside the housing 11. The multiple high-voltage positioning shafts 16 are evenly arranged around multiple high-voltage electrode plates 15. The two ends of each high-voltage positioning shaft 16 are fixedly connected to the high-voltage support base 17 respectively. Each high-voltage positioning shaft 16 is fixedly connected to each high-voltage electrode plate 15. A central fixing shaft 19 is vertically arranged inside the housing 11. The central fixing shaft 19 is located between the multiple high-voltage positioning shafts 16. The two ends of the central fixing shaft 19 pass through two high-voltage support bases 17 respectively. The lower end of the central fixing shaft 19 is fixedly connected to the bottom of the housing 11. The central fixing shaft 19 passes through each high-voltage electrode plate 15 and each collecting electrode plate 18. The central fixing shaft 19 is fixedly connected to each collecting electrode plate 18.

[0035] like Figure 2 As shown, each high-voltage support 17 is provided with an insulating seat 20 on the side away from the central fixed shaft 19. The insulating seat 20 is fixedly connected to the corresponding high-voltage support 17 and the inner wall of the housing 11.

[0036] like Figure 2As shown, a pressure-bearing adapter cover 14 is provided inside the housing 11 near the upper end of the central fixed shaft 19. The pressure-bearing adapter cover 14 is fixedly connected to the inner wall of the housing 11 and the upper end of the central fixed shaft 19, so that the pressure-bearing adapter cover 14 and the area inside the housing 11 near the central fixed shaft 19 form a pressure-resistant ionization cavity 23. An air inlet 22 is provided on the pressure-bearing adapter cover 14, and the air inlet 22 is connected to the pressure-resistant ionization cavity 23.

[0037] like Figure 2 As shown, a plurality of signal insulators 21 are provided on the side of the pressure-bearing adapter cover 14 away from the central fixed shaft 19. There are eleven signal insulators 21, nine high-voltage plates 15, and ten collecting plates 18. The nine high-voltage plates 15 and two high-voltage support seats 17 divide the interior of the housing 11 between the two high-voltage support seats 17 into 10 detection sensitive zones from top to bottom. The nine high-voltage plates 15 and the two high-voltage support seats 17 form a high-voltage electrode. The high-voltage electrode is electrically connected to one of the signal insulators 21. The ten collecting plates 18 correspond one-to-one with the ten signal insulators 21. Each collecting plate 18 is electrically connected to the corresponding signal insulator 21. An airtight connector 13 is provided on the upper part of the housing 11. The airtight connector 13 is electrically connected to the eleven signal insulators 21 and the front-end data processing unit 2 respectively.

[0038] like Figure 1 As shown, the airtight connector 13 is connected to the front-end data processing unit 2 via a multi-core radiation-resistant shielded cable 4.

[0039] like Figure 2 As shown, the upper part of the housing 11 has an open structure, and a sealing cover 12 is detachably and sealingly connected to the upper part of the housing 11. An airtight connector 13 is disposed on the sealing cover 12.

[0040] like Figure 3 As shown, the collimation shield 3 consists of a shielding main shell 32 and a shielding cover shell 33. The shielding main shell 32 is a box structure with an opening at the top. The shielding cover shell 33 is located at the opening at the top of the shielding main shell 32 and is detachably and sealed to the shielding main shell 32. The side walls of the shielding main shell 32 and the side walls of the shielding cover shell 33 are both hollow structures. Shielding material 31 is respectively provided inside the side walls of the shielding main shell 32 and the side walls of the shielding cover shell 33. Multiple collimation windows 34 are opened on one side of the shielding main shell 32 and are evenly arranged along the vertical direction.

[0041] like Figure 1 As shown, the lower part of the collimating shield 3 is provided with a mounting bracket 5, that is, the lower part of the shielding body shell 32 is connected to the upper part of the mounting bracket 5.

[0042] Working principle: such as Figure 4As shown, the container 6 under test contains two radioactive media: liquid and foam. The liquid and foam release gamma rays of different intensities: the liquid has a high density and contains a high density of radioactive material, resulting in a high flux of gamma rays transmitted into the ionization chamber, which has a more significant ionization effect on the inert gas, thus the ionization signal of the inert gas at the corresponding height is stronger; the foam has a high porosity, low equivalent density, and contains a low density of radioactive material, resulting in a low flux of gamma rays transmitted into the ionization chamber, which makes the ionization effect of the inert gas less significant, and the ionization signal at the corresponding height is weaker.

[0043] Gamma rays pass through multiple collimation windows 34, ionizing the inert gas in the pressure-resistant ionization cavity 23 to generate charged particles. The high-voltage electric field of each detection sensitive area drives the charged particles to drift directionally to the corresponding collection plate 18. After the collection plate 18 captures the charged particles, it generates a weak current signal that is approximately linearly related to the intensity of the incident gamma rays. This signal is led out through the signal insulator 21, passes through the wall of the housing 11 through the airtight connector 13, and is transmitted to the front-end data processing unit 2 by the multi-core radiation-resistant shielded cable 4.

[0044] The front-end data processing unit 2 synchronously samples, integrates, amplifies, and digitizes the ionization current signals of each detection sensitive area. Based on the gradient change characteristics of the ionization signals between adjacent detection sensitive areas, it identifies the interface position. When the ionization signal changes from a strong signal corresponding to the liquid layer to a weaker signal corresponding to the foam layer from bottom to top, the position is determined to be the upper surface of the liquid (liquid-foam interface). When the ionization signal gradually decreases from a weak signal corresponding to the foam layer to the background radiation level and tends to stabilize, the position is determined to be the upper surface of the foam (foam-vapor interface). This enables independent positioning and dynamic tracking of the liquid layer and foam layer in the vertical direction without direct contact with the medium and is unaffected by the conductivity, corrosiveness, and phase changes of the medium, meeting the requirements for non-contact real-time monitoring of multiphase interfaces under high radioactivity, closed, and inaccessible conditions.

[0045] The ionization chamber type liquid level detection device of the present invention, suitable for various highly radioactive media, has the following other advantages:

[0046] This invention employs a multi-polar ionization chamber detector as the measuring element, determining the liquid level height based on the radioactivity level of the measured medium. It is not limited by the type of medium and can measure radioactive media such as deposited solids, liquids, and foams. Compared to existing technologies, it can simultaneously measure the liquid level of multiple media. The detection element and electronic components are separately positioned, and the measuring end is equipped with a collimation shield to ensure accurate measurement data and adaptability to harsh conditions such as high radioactivity and high temperatures. This detection device uses an indirect measurement method, offering high tolerance for the measured container without causing damage, and can be arranged according to requirements.

[0047] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An ionization chamber type liquid level detection device suitable for various highly radioactive media, characterized in that, include: The multi-electrode ionization chamber detector includes a vertically arranged shell, two high-voltage support bases, multiple horizontally arranged collecting electrodes, and a horizontally arranged high-voltage electrode between two adjacent collecting electrodes. The two high-voltage support bases are horizontally arranged inside the shell, and the multiple collecting electrodes are arranged between the two high-voltage support bases and uniformly arranged in the vertical direction. The shell contains an inert gas at a preset pressure. The radiation released by the highly radioactive medium ionizes the inert gas to generate charged particles. The two high-voltage support bases and the multiple high-voltage electrodes are all connected to a high-voltage power supply and are interconnected. Each collecting electrode captures charged particles and generates an ionization signal. The collimating shield is a box-shaped structure that is fitted onto the outside of the shell. The collimating shield has a horizontally opened collimating window near each collecting electrode plate. The rays emitted by the highly radioactive medium enter the interior of the shell through the collimating window. The front-end data processing unit is electrically connected to multiple collecting plates and is used to receive ionization signals from multiple collecting plates. Based on the different intensities of radiation emitted by different highly radioactive media, the ionization signals generated by the ionized inert gas are also different, so as to determine the liquid level height of the corresponding highly radioactive medium.

2. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 1, characterized in that, The two high-voltage support bases and multiple high-voltage plates are arranged at equal intervals along the vertical direction, and the distance between each high-voltage plate and the two adjacent collecting plates is equal.

3. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 2, characterized in that, The distance between each high-voltage electrode and the adjacent collecting electrode is 11mm to 14mm.

4. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 1, characterized in that, The inert gas consists of nitrogen and argon.

5. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 4, characterized in that, The nitrogen gas accounts for 85% to 95% of the volume, and the argon gas accounts for 5% to 15% of the volume.

6. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 4, characterized in that, The preset pressure of the inert gas is 0.8MPa~1.2MPa.

7. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 1, characterized in that, Multiple high-voltage positioning shafts are vertically arranged inside the housing, and these shafts are evenly distributed around multiple high-voltage electrode plates. Each high-voltage positioning shaft has its two ends fixedly connected to a high-voltage support base and to each high-voltage electrode plate. A central fixing shaft is vertically arranged inside the housing, located between the multiple high-voltage positioning shafts. Both ends of the central fixing shaft pass through two high-voltage support bases, and its lower end is fixedly connected to the bottom of the housing. The central fixing shaft passes through each high-voltage electrode plate and each collecting electrode plate, and is fixedly connected to each collecting electrode plate.

8. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 7, characterized in that, Each of the high-voltage support seats is provided with an insulating seat on the side away from the central fixed axis, and the insulating seat is fixedly connected to the corresponding high-voltage support seat and the inner wall of the housing.

9. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 7, characterized in that, A pressure-bearing adapter cover is provided inside the housing near the upper end of the central fixed shaft. The pressure-bearing adapter cover is fixedly connected to the inner wall of the housing and the upper end of the central fixed shaft, so that the pressure-bearing adapter cover and the area inside the housing near the central fixed shaft form a pressure-resistant ionization cavity. An air inlet is provided on the pressure-bearing adapter cover, and the air inlet is connected to the pressure-resistant ionization cavity.

10. The ionization chamber type liquid level detection device suitable for various highly radioactive media according to claim 9, characterized in that, Multiple signal insulators are provided on the side of the pressure-bearing adapter cover away from the central fixed axis. Two high-voltage support seats and multiple high-voltage plates form a high-voltage pole, and the high-voltage pole is electrically connected to one of the signal insulators. The remaining signal insulators correspond one-to-one with multiple collection plates, and each collection plate is electrically connected to the corresponding signal insulator. An airtight connector is provided on the upper part of the housing, and the airtight connector is electrically connected to multiple signal insulators and the front-end data processing unit.

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