Guided wave type radar liquid level meter

Abstract

The utility model discloses a guided wave type radar liquid level meter which is characterized in that an outer shell is detachably connected with a radar liquid level meter body and a pressure-bearing shell, and a primary guided wave core rod can be electrically connected with the radar liquid level meter body; an installation space is formed between the outer shell and the pressure-bearing shell, the second-stage insulation supporting cylinder and the second-stage sealing assembly are both distributed in the installation space, the first-stage wave guide core rod extends into the installation space and is detachably connected with the second-stage wave guide core rod, and the end, detachably connected with the first-stage wave guide core rod, of the second-stage wave guide core rod is in lap joint with the second-stage insulation supporting cylinder; the other end of the second-stage wave guide core rod penetrates through the second-stage insulating support cylinder and extends out of the pressure-bearing shell; the second-stage sealing assembly can seal a gap between the outer circumferential wall of the second-stage insulation supporting cylinder and the inner circumferential wall of the installation space, and can seal a gap between the lap joint of the second-stage wave guide core rod and the second-stage insulation supporting cylinder. The measurement accuracy, the service life and the assembly efficiency of the guided wave type radar liquid level meter are improved, and the production cost and the use cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measurement, in particular to a guided wave radar liquid level meter. Background Art

[0002] The guided wave radar level meter emits radar waves of a certain frequency and transmits them along the waveguide rod. When encountering media with different dielectric constants, the radar waves will be reflected. By measuring the time difference required for reflection, the height of the measured medium from the top can be calculated, thereby calculating the actual liquid level of the medium.

[0003] Among them, for the guided wave radar level meter used in nuclear power plants, the guided wave radar level meter usually needs to experience negative pressure conditions, high temperature conditions and steam conditions, so in order to improve the adaptability of the guided wave radar level meter to the above conditions, the prior art usually adopts a multi-stage sealing method to reduce the risk of high temperature steam entering the guided wave radar level meter, so as to improve the measurement accuracy and service life of the guided wave radar level meter. However, the multi-stage sealing method in the prior art involves welding sealing and casting sealing, which makes it impossible to regularly maintain and repair the guided wave radar level meter in the future. It is understandable that if the guided wave radar level meter fails, it can only be replaced with a new one, which has high use costs; secondly, it is easy to cause irreversible damage to the structure during the welding process, resulting in high production costs; secondly, the use of welding sealing and casting sealing methods will also cause a long assembly cycle for assembling the guided wave radar level meter, resulting in low production efficiency and high production costs. Utility Model Content

[0004] The utility model aims to provide a guided wave radar level meter to solve the above problems existing in the guided wave radar level meter in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Guided wave radar level meter, including:

[0007] Radar level gauge body;

[0008] A primary waveguide assembly, the primary waveguide assembly comprising an outer shell, a primary insulating support tube inserted in the outer shell, and a primary waveguide core rod inserted in the primary insulating support tube, one end of the outer shell along the length direction can be detachably connected to the radar level meter body, and one end of the primary waveguide core rod along the length direction can be electrically connected to the radar level meter body;

[0009] A secondary waveguide assembly, the secondary waveguide assembly comprising a pressure-bearing shell, a secondary insulating support tube, a secondary sealing assembly and a secondary waveguide core rod, the other end of the outer shell along the length direction is detachably connected to the pressure-bearing shell, and an installation space is formed between the outer shell and the pressure-bearing shell, the secondary insulating support tube and the secondary sealing assembly are both distributed in the installation space, the other end of the primary waveguide core rod along the length direction extends into the installation space and is detachably connected to one end of the secondary waveguide core rod along the length direction, and one end of the secondary waveguide core rod detachably connected to the primary waveguide core rod is overlapped with the secondary insulating support tube; the other end of the secondary waveguide core rod along the length direction passes through the secondary insulating support tube and extends out of the pressure-bearing shell;

[0010] The secondary sealing assembly is configured to seal the gap between the outer circumferential wall of the secondary insulating support tube and the inner circumferential wall of the installation space, and to seal the gap between the overlap of the secondary waveguide core rod and the secondary insulating support tube.

[0011] As a preferred solution of the above-mentioned guided wave radar level meter, the installation space and the secondary insulating support tube are both in a frustum shape, and the large end of the installation space and the large end of the secondary insulating support tube are both close to the outer shell;

[0012] The secondary sealing assembly includes a first frusto-conical sealing ring which is sleeved on the outer circumference of the secondary insulating support tube, the large end of the first frusto-conical sealing ring is close to the outer shell, and the first frusto-conical sealing ring is used to seal the gap between the outer circumferential wall of the secondary insulating support tube and the inner circumferential wall of the installation space.

[0013] As a preferred solution of the above-mentioned guided wave radar level gauge, the secondary waveguide core rod comprises a lap joint and a core rod portion, the lap joint is arranged around the outer periphery of the core rod portion and distributed at one end of the core rod portion along the length direction, and the core rod portion is detachably connected to the primary waveguide core rod;

[0014] Along the length direction of the outer shell, the end surface of the secondary insulating support tube close to the outer shell is concavely provided with a lap groove, the bottom wall of the lap groove is provided with a first through hole, the pressure-bearing shell is further provided with a second through hole communicating with the installation space, the lap portion is lapped with the lap groove, and the core rod portion passes through the first through hole and the second through hole and extends out of the pressure-bearing shell;

[0015] The secondary sealing assembly also includes a sealing ring group, which is used to seal the gap between the inner wall of the overlapping groove and the overlapping part.

[0016] As a preferred solution of the above-mentioned guided wave radar level meter, the overlapping groove is in a frustum shape, and the large end of the overlapping groove is close to the outer shell;

[0017] The sealing ring group includes a second frustoconical sealing ring, which is sleeved on the outer periphery of the core rod portion, with the large end of the second frustoconical sealing ring close to the outer shell, and the second frustoconical sealing ring is used to seal the gap between the bottom wall of the lap joint, the outer peripheral wall of the core rod portion, the inner bottom wall of the lap joint groove and the inner peripheral wall of the lap joint groove.

[0018] As a preferred solution of the above-mentioned guided wave radar level meter, the sealing ring group also includes a third frusto-conical sealing ring, which is sleeved on the outer periphery of the overlapping portion, and the large end of the third frusto-conical sealing ring is close to the outer shell, and the third frusto-conical sealing ring is used to seal the gap between the outer peripheral wall of the overlapping portion, the second frusto-conical sealing ring and the inner peripheral wall of the overlapping groove.

[0019] As a preferred solution of the above-mentioned guided wave radar level meter, the pressure-bearing shell is provided with a threaded through hole connected to the installation space, and the outer shell is provided with a first threaded connection part, which is threadedly connected to the threaded through hole and can be tightly pressed against the large end face of the secondary insulating support tube, the large end face of the first frustum-shaped sealing ring and the secondary waveguide core rod.

[0020] As a preferred solution of the above-mentioned guided wave radar level gauge, the diameter of the threaded through hole is larger than the diameter of the large end of the installation space, and a lap joint is formed at the connection between the threaded through hole and the installation space;

[0021] The secondary waveguide assembly also includes an insulating clamping ring, which is distributed in the threaded through hole. The primary waveguide core rod passes through the insulating clamping ring and is detachably connected to the secondary waveguide core rod. The first threaded connection portion can drive the insulating clamping ring to press against the lap surface, the large end face of the secondary insulating support tube, the large end face of the first frustum-shaped sealing ring and the secondary waveguide core rod.

[0022] As a preferred solution of the above-mentioned guided wave radar level meter, the secondary waveguide core rod is provided with a first threaded blind hole at one end along the length direction, and the primary waveguide core rod is provided with an external thread, which is threadedly connected to the first threaded blind hole.

[0023] As a preferred solution of the above-mentioned guided wave radar level gauge, the first-level waveguide assembly further includes a first-level sealing assembly, and the first-level sealing assembly includes a first sealing ring, and along the length direction of the outer shell, the first sealing ring is distributed on the first-level waveguide core rod away from the end of the second-level waveguide core rod;

[0024] The first-level insulating support tube is cylindrical, and the first sealing ring is partially embedded in the inner circumferential wall of the first-level insulating support tube or the outer circumferential wall of the first-level waveguide core rod. The first sealing ring is used to seal the gap between the inner circumferential wall of the first-level insulating support tube and the outer circumferential wall of the first-level waveguide core rod.

[0025] As a preferred solution of the above-mentioned guided wave radar level gauge, the primary sealing assembly further includes a second sealing ring, and along the length direction of the outer shell, the second sealing ring is distributed on the end of the primary waveguide core rod away from the secondary waveguide core rod;

[0026] The second sealing ring is partially embedded in the outer peripheral wall of the primary insulating support tube or the inner peripheral wall of the outer shell, and the second sealing ring is used to seal the gap between the outer peripheral wall of the primary insulating support tube and the inner peripheral wall of the outer shell.

[0027] Beneficial effects of the utility model:

[0028] The purpose of the utility model is to provide a waveguide radar level meter, which includes a radar level meter body, a primary waveguide component and a secondary waveguide component. The primary waveguide component includes an outer shell, a primary insulating support tube inserted in the outer shell, and a primary waveguide core rod inserted in the primary insulating support tube. One end of the outer shell along the length direction can be detachably connected to the radar level meter body, and one end of the primary waveguide core rod along the length direction can be electrically connected to the radar level meter body; the secondary waveguide component includes a pressure-bearing shell, a secondary insulating support tube, a secondary sealing component and a secondary waveguide core rod. The other end of the outer shell along the length direction can be detachably connected to the pressure-bearing shell, and an installation space is formed between the outer shell and the pressure-bearing shell. The secondary insulating support tube and the secondary sealing component are connected to the pressure-bearing shell. The components are all distributed in the installation space, the other end of the primary waveguide core rod along the length direction extends into the installation space and is detachably connected to one end of the secondary waveguide core rod along the length direction, and the end of the secondary waveguide core rod that is detachably connected to the primary waveguide core rod is overlapped with the secondary insulating support tube; the other end of the secondary waveguide core rod along the length direction passes through the secondary insulating support tube and extends out of the pressure-bearing shell; the secondary sealing assembly is configured to be able to seal the gap between the outer peripheral wall of the secondary insulating support tube and the inner peripheral wall of the installation space, and to seal the gap between the overlap of the secondary waveguide core rod and the secondary insulating support tube.

[0029] When the guided wave radar level meter is working, the radar level meter body emits radar waves of a certain frequency. The radar waves are transmitted along the primary waveguide core rod and the secondary waveguide core rod. When encountering media with different dielectric constants, the radar waves will be reflected. By measuring the time difference required for reflection, the height of the measured medium from the radar level meter body can be calculated, thereby calculating the actual liquid level height of the medium. Among them, by arranging the outer shell and the pressure-bearing shell to be detachably connected and forming an installation space, the secondary insulating support tube and the secondary sealing assembly are distributed in the installation space, and a secondary waveguide core rod is arranged to overlap the secondary insulating support tube. The gap between the outer peripheral wall of the secondary insulating support tube and the inner peripheral wall of the installation space is sealed by the secondary sealing assembly, and the gap between the overlapping part of the secondary waveguide core rod and the secondary insulating support tube is sealed, so that the external high-temperature vaporized medium cannot flow from the gap between the outer peripheral wall of the secondary insulating support tube and the pressure-bearing shell to the connection between the primary waveguide core rod and the secondary waveguide core rod, and thus cannot flow to the gap between the primary waveguide core rod and the primary insulating support tube, and also cannot flow from the gap between the overlapping part of the secondary waveguide core rod and the secondary insulating support tube to the connection between the primary waveguide core rod and the secondary waveguide core rod, and thus cannot flow to the gap between the primary waveguide core rod and the primary insulating support tube, thereby effectively preventing the high-temperature vaporized medium from entering the guided wave radar level meter, and effectively improving the measurement accuracy and service life of the guided wave radar level meter.

[0030] Secondly, in the guided wave radar level gauge, the outer shell, the pressure shell and the first-level insulating support tube can be detachably connected, the first-level insulating support tube and the first-level waveguide core rod can be detachably connected, and the second-level insulating support tube, the second-level sealing assembly and the second-level waveguide core rod can be detachably connected, so that the guided wave radar level gauge is easy to assemble, which effectively improves the assembly efficiency of the guided wave radar level gauge; and can effectively avoid structural damage caused during the assembly process, thereby effectively reducing the production cost; and is convenient for later maintenance and overhaul, effectively reducing the cost of use.

[0031] Thereby, high-temperature vaporized medium can be effectively prevented from entering the guided wave radar level meter, thereby effectively improving the measurement accuracy and service life of the guided wave radar level meter, and effectively improving the assembly efficiency of the guided wave radar level meter, thereby effectively reducing the production cost and use cost of the guided wave radar level meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a guided wave radar level meter provided by a specific embodiment of the utility model;

[0033] Figure 2 It is a cross-sectional view of a guided wave radar level meter provided by a specific embodiment of the utility model;

[0034] Figure 3It is a partial cross-sectional view of a guided wave radar level meter provided by a specific embodiment of the utility model;

[0035] Figure 4 It is a cross-sectional view of a secondary insulating support tube of a guided wave radar level gauge provided by a specific embodiment of the utility model;

[0036] Figure 5 It is a cross-sectional view of a pressure-bearing shell of a guided wave radar level gauge provided by a specific embodiment of the utility model;

[0037] Figure 6 It is a cross-sectional view of a secondary waveguide core rod of a waveguide radar level gauge provided by a specific embodiment of the utility model;

[0038] Figure 7 yes Figure 2 Partial view at A.

[0039] In the figure:

[0040] 1. Primary waveguide assembly; 11. outer shell; 111. first threaded connection portion; 112. heat dissipation fins; 113. second threaded connection portion; 12. primary insulating support cylinder; 13. primary waveguide core rod; 14. first sealing ring; 15. second sealing ring;

[0041] 2. Secondary waveguide assembly;

[0042] 21. pressure-bearing shell; 211. installation space; 212. second through hole; 213. threaded through hole; 214. lap joint surface;

[0043] 22. Secondary insulating support tube; 221. Overlap groove; 222. First through hole;

[0044] 23. Secondary sealing assembly; 231. First frustum-shaped sealing ring; 232. Second frustum-shaped sealing ring; 233. Third frustum-shaped sealing ring;

[0045] 24, secondary waveguide core rod; 241, overlapping portion; 242, core rod portion; 243, first threaded blind hole;

[0046] 25. Insulation clamping ring;

[0047] 31. Flange; 32. Protective tube; 321. Vent hole;

[0048] 4. Nut connector; 41. Conductive pin. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0053] For the guided wave radar level meter used in nuclear power plants, the guided wave radar level meter usually needs to experience negative pressure conditions, high temperature conditions and steam conditions, so in order to improve the adaptability of the guided wave radar level meter to the above conditions, the prior art usually adopts a multi-stage sealing method to reduce the risk of high-temperature steam entering the guided wave radar level meter, so as to improve the measurement accuracy and service life of the guided wave radar level meter. However, the multi-stage sealing method in the prior art involves welding sealing and casting sealing, which makes it impossible to regularly maintain and repair the guided wave radar level meter in the future. It is understandable that if the guided wave radar level meter fails, the guided wave radar level meter can only be replaced, which has high use costs; secondly, it is easy to cause irreversible damage to the structure during the welding process, resulting in high production costs; secondly, the use of welding sealing and casting sealing methods will also cause a long assembly cycle for assembling the guided wave radar level meter, resulting in low production efficiency and high production costs.

[0054] Therefore, the utility model provides a guided wave radar level meter, such as Figure 1-6 As shown, the waveguide radar level meter includes a radar level meter body, a primary waveguide component 1 and a secondary waveguide component 2. The primary waveguide component 1 includes an outer shell 11, a primary insulating support tube 12 inserted in the outer shell 11, and a primary waveguide core rod 13 inserted in the primary insulating support tube 12. One end of the outer shell 11 along the length direction can be detachably connected to the radar level meter body, and one end of the primary waveguide core rod 13 along the length direction can be electrically connected to the radar level meter body; the secondary waveguide component 2 includes a pressure-bearing shell 21, a secondary insulating support tube 22, a secondary sealing component 23 and a secondary waveguide core rod 24. The other end of the outer shell 11 along the length direction is detachably connected to the pressure-bearing shell 21, and an installation is formed between the outer shell 11 and the pressure-bearing shell 21. The space 211, the secondary insulating support tube 22 and the secondary sealing assembly 23 are all distributed in the installation space 211, the other end of the primary waveguide core rod 13 along the length direction extends into the installation space 211 and is detachably connected to one end of the secondary waveguide core rod 24 along the length direction, and the end of the secondary waveguide core rod 24 that is detachably connected to the primary waveguide core rod 13 is overlapped with the secondary insulating support tube 22; the other end of the secondary waveguide core rod 24 along the length direction passes through the secondary insulating support tube 22 and extends out of the pressure-bearing shell 21; the secondary sealing assembly 23 is configured to be able to seal the gap between the outer peripheral wall of the secondary insulating support tube 22 and the inner peripheral wall of the installation space 211, and can seal the gap between the overlapping part of the secondary waveguide core rod 24 and the secondary insulating support tube 22.

[0055] When the waveguide radar level meter is working, the radar level meter body emits radar waves of a certain frequency, and the radar waves are transmitted along the primary waveguide core rod 13 and the secondary waveguide core rod 24. When encountering a medium with a different dielectric constant, the radar wave will be reflected. By measuring the time difference required for reflection, the height of the measured medium from the radar level meter body can be calculated, so that the actual liquid level of the medium can be calculated. Among them, by setting the outer shell 11 and the pressure shell 21 to be detachably connected and forming an installation space 211, the secondary insulating support tube 22 and the secondary sealing assembly 23 are both distributed in the installation space 211, and the secondary waveguide core rod 24 is set to overlap the secondary insulating support tube 22. The gap between the outer peripheral wall of the secondary insulating support tube 22 and the inner peripheral wall of the installation space 211 is sealed by the secondary sealing assembly 23, and the gap between the overlap of the secondary waveguide core rod 24 and the secondary insulating support tube 22 is sealed, so that the external high-temperature gasified medium cannot pass through the gap between the outer peripheral wall of the secondary insulating support tube 22 and the pressure shell 21 It flows to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24, and thus cannot flow to the gap between the primary waveguide core rod 13 and the primary insulating support tube 12, and also makes it impossible for the external high-temperature vaporized medium to flow from the gap between the overlap of the secondary waveguide core rod 24 and the secondary insulating support tube 22 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24, and thus cannot flow to the gap between the primary waveguide core rod 13 and the primary insulating support tube 12, thereby effectively preventing the high-temperature vaporized medium from entering the guided wave radar level meter, and effectively improving the measurement accuracy and service life of the guided wave radar level meter.

[0056] Secondly, in the guided wave radar level gauge, the outer shell 11 is detachably connected to the pressure shell 21 and the first-level insulating support tube 12, the first-level insulating support tube 12 is detachably connected to the first-level waveguide core rod 13, and the second-level insulating support tube 22, the second-level sealing assembly 23 and the second-level waveguide core rod 24 are detachably connected, making the guided wave radar level gauge easy to assemble, effectively improving the assembly efficiency of the guided wave radar level gauge; and can effectively avoid structural damage caused during the assembly process, thereby effectively reducing the production cost; and is convenient for later maintenance and overhaul, effectively reducing the cost of use.

[0057] Thereby, high-temperature vaporized medium can be effectively prevented from entering the guided wave radar level meter, thereby effectively improving the measurement accuracy and service life of the guided wave radar level meter, and effectively improving the assembly efficiency of the guided wave radar level meter, thereby effectively reducing the production cost and use cost of the guided wave radar level meter.

[0058] It is understandable that if Figure 1 and Figure 2As shown, the length direction of the outer shell 11, the length direction of the primary insulating support tube 12, the length direction of the primary waveguide core rod 13, the length direction of the pressure-bearing shell 21 and the length direction of the secondary waveguide core rod 24 are all parallel. Figure 2 The up-down direction is the length direction of the outer shell 11.

[0059] Specifically, Figure 1 and Figure 2 As shown, the outer peripheral wall of the pressure shell 21 is fixedly sleeved with a flange 31, and the flange 31 is located at one end of the pressure shell 21 away from the outer shell 11. The waveguide radar level gauge is installed at the working position through the flange 31. It can be understood that the secondary waveguide component 2 is closer to the high-temperature gasified medium relative to the primary waveguide component 1. Specifically, in this embodiment, the flange 31 is welded to the pressure shell 21. The connection strength of the flange 31 to the pressure shell 21 can be guaranteed.

[0060] Preferably, if Figure 1 and Figure 2 As shown, the flange 31 is fixed with a protection tube 32, and the protection tube 32 is sleeved on the portion of the secondary waveguide core rod 24 that extends out of the pressure-bearing housing 21 and is clearance-matched with the secondary waveguide core rod 24. Specifically, in this embodiment, the protection tube 32 is welded to the flange 31. The connection strength between the protection tube 32 and the flange 31 can be ensured. As an alternative, the flange 31 and the protection tube 32 can also be integrally injection molded.

[0061] More specifically, if Figure 1 As shown, the protection tube 32 is provided with a vent hole 321 for circulating gas, so that the high-temperature gasified medium can contact the secondary waveguide core rod 24 .

[0062] Preferably, there are a plurality of vent holes 321, which are spaced apart along the axial direction of the protection tube 32. Such an arrangement can improve the contact efficiency between the high-temperature vaporized medium and the secondary waveguide core rod 24.

[0063] Among them, Figure 2 and Figure 7As shown, the primary waveguide assembly 1 also includes a primary sealing assembly, which includes a first sealing ring 14. Along the length direction of the outer shell 11, the first sealing ring 14 is distributed on the primary waveguide core rod 13 at one end away from the secondary waveguide core rod 24; the primary insulating support tube 12 is cylindrical, and the first sealing ring 14 is partially embedded in the inner circumferential wall of the primary insulating support tube 12 or the outer circumferential wall of the primary waveguide core rod 13. The first sealing ring 14 is used to seal the gap between the inner circumferential wall of the primary insulating support tube 12 and the outer circumferential wall of the primary waveguide core rod 13. Such an arrangement can prevent external gas from entering the guided wave radar level meter through the gap between the inner circumferential wall of the primary insulating support tube 12 and the outer circumferential wall of the primary waveguide core rod 13.

[0064] More specifically, in this embodiment, Figure 2 and Figure 7 As shown, the inner circumferential wall of the primary insulating support tube 12 is provided with a first annular sealing groove, and the first sealing ring 14 is partially embedded in the first annular sealing groove and is in close contact with the outer circumferential wall of the primary waveguide core rod 13. Preferably, the first sealing ring 14 is in close contact with the outer circumferential wall of the primary waveguide core rod 13 and each inner wall of the first annular sealing groove. To improve the sealing performance of the first sealing ring 14. Specifically, in this embodiment, the first sealing ring 14 is exemplarily set to be an O-type rubber sealing ring.

[0065] As an alternative, the outer circumferential wall of the primary waveguide core rod 13 is provided with a first annular sealing groove, and the first sealing ring 14 is partially embedded in the first annular sealing groove and in close contact with the inner circumferential wall of the primary insulating support tube 12 .

[0066] Preferably, there are multiple first sealing rings 14, and the multiple first sealing rings 14 are spaced apart along the length direction of the primary waveguide core rod 13. Such an arrangement can improve the sealing performance of sealing the gap between the inner circumferential wall of the primary insulating support tube 12 and the outer circumferential wall of the primary waveguide core rod 13. In this embodiment, four first sealing rings 14 are provided as an example. It can be understood that the number of first sealing rings 14 can be adaptively adjusted according to actual working conditions.

[0067] Specifically, Figure 2 and Figure 7 As shown, the primary sealing assembly also includes a second sealing ring 15, which is distributed on the end of the primary waveguide core rod 13 away from the secondary waveguide core rod 24 along the length direction of the outer shell 11; the second sealing ring 15 is partially embedded in the outer peripheral wall of the primary insulating support tube 12 or the inner peripheral wall of the outer shell 11, and the second sealing ring 15 is used to seal the gap between the outer peripheral wall of the primary insulating support tube 12 and the inner peripheral wall of the outer shell 11. Such an arrangement can prevent external gas from entering the guided wave radar level meter through the gap between the outer peripheral wall of the primary insulating support tube 12 and the inner peripheral wall of the outer shell 11.

[0068] More specifically, in this embodiment, Figure 2 and Figure 7 As shown, the inner peripheral wall of the outer shell 11 is provided with a second annular sealing groove, and the second sealing ring 15 is partially embedded in the second annular sealing groove and is in close contact with the outer peripheral wall of the primary insulating support tube 12. Preferably, the second sealing ring 15 is in close contact with the outer peripheral wall of the primary insulating support tube 12 and each inner wall of the second annular sealing groove. To improve the sealing performance of the second sealing ring 15. Specifically, in this embodiment, the second sealing ring 15 is exemplarily set to be an O-type rubber sealing ring.

[0069] As an alternative, the outer peripheral wall of the primary insulating support tube 12 is provided with a second annular sealing groove, and the second sealing ring 15 is partially embedded in the second annular sealing groove and in close contact with the inner peripheral wall of the outer shell 11 .

[0070] Preferably, there are multiple second sealing rings 15, and the multiple second sealing rings 15 are spaced apart along the length direction of the primary waveguide core rod 13. Such an arrangement can improve the sealing performance of the gap between the outer peripheral wall of the primary insulating support tube 12 and the inner peripheral wall of the outer shell 11. Figure 2 As shown, four second sealing rings 15 are provided as an example. It can be understood that the number of the second sealing rings 15 can be adaptively adjusted according to actual working conditions.

[0071] It is understandable that if Figure 2 As shown, along the length direction of the housing, the primary sealing assembly and the secondary sealing assembly 23 form a bidirectional seal, which can effectively ensure the working performance of the primary waveguide core rod 13 and the secondary waveguide core rod 24. The primary insulating support tube 12 and the secondary insulating support tube 22 can effectively avoid external signal interference.

[0072] It can be understood that the first sealing component is far away from the high-temperature gasification medium relative to the secondary sealing component 23, so the first sealing component is less affected by the temperature of the high-temperature gasification medium. The first sealing ring 14 and the second sealing ring 15 of the first sealing component are both O-type rubber sealing rings, which are sufficient to ensure the sealing performance.

[0073] Preferably, if Figure 1 and Figure 2 As shown, the outer peripheral wall of the outer shell 11 is provided with a plurality of heat dissipation fins 112 at intervals along the length direction. Such a configuration can improve the heat dissipation performance of the primary waveguide assembly 1, thereby further reducing the influence of the temperature of the high-temperature vaporized medium on the first sealing assembly, thereby further improving the sealing performance of the first sealing assembly.

[0074] Among them, Figure 2-5As shown, the installation space 211 and the secondary insulating support tube 22 are both in the shape of a cone, and the large end of the installation space 211 and the large end of the secondary insulating support tube 22 are both close to the outer shell 11; the secondary sealing assembly 23 includes a first cone-shaped sealing ring 231 sleeved on the outer periphery of the secondary insulating support tube 22, the large end of the first cone-shaped sealing ring 231 is close to the outer shell 11, and the first cone-shaped sealing ring 231 is used to seal the gap between the outer peripheral wall of the secondary insulating support tube 22 and the inner peripheral wall of the installation space 211. Such a configuration prevents the external high-temperature gasification medium from flowing from the gap between the outer peripheral wall of the secondary insulating support tube 22 and the pressure-bearing shell 21 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24, thereby preventing it from flowing to the gap between the primary waveguide core rod 13 and the primary insulating support tube 12, and can avoid the defects caused by welding sealing in the prior art. It can be understood that the inner ring and outer ring of the first cone-shaped sealing ring 231 are both in the shape of a cone. The height direction of the secondary insulating support tube 22 is parallel to the length direction of the outer shell 11 .

[0075] Preferably, in this embodiment, the first frustum-shaped sealing ring 231 is a graphite sealing ring. The graphite sealing ring has good high temperature resistance, thermal shock resistance, electrical conductivity, lubricity and chemical stability.

[0076] Among them, Figure 2-6 As shown, the secondary waveguide core rod 24 includes a lap joint 241 and a core rod portion 242, the lap joint 241 is arranged around the outer periphery of the core rod portion 242 and distributed at one end of the core rod portion 242 along the length direction, and the core rod portion 242 is detachably connected to the primary waveguide core rod 13; along the length direction of the outer shell 11, an lap joint groove 221 is recessed on the end surface of the secondary insulating support tube 22 close to the outer shell 11, and a first through hole 222 is provided on the bottom wall of the lap joint groove 221, and the pressure-bearing shell 21 is also provided with a second through hole 212 connected to the installation space 211, the lap joint 241 is lapped on the lap joint groove 221, and the core rod portion 242 passes through the first through hole 222 and the second through hole 212 and extends out of the pressure-bearing shell 21; the secondary sealing assembly 23 also includes a sealing ring group, which is used to seal the gap between the inner wall of the lap joint groove 221 and the lap joint 241. By setting the overlap portion 241, the relative positions of the primary waveguide core rod 13, the secondary waveguide core rod 24, the secondary insulating support tube 22 and the pressure-bearing shell 21 can be preliminarily located during the assembly process, which facilitates the assembly of the sealing ring group, thereby effectively avoiding the defects caused by casting sealing in the prior art; by setting the sealing ring group to seal the gap between the inner wall of the overlap groove 221 and the overlap portion 241, the external high-temperature vaporized medium cannot flow from the gap between the overlap portion 241 and the overlap groove 221 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24, and thus cannot flow to the gap between the primary waveguide core rod 13 and the primary insulating support tube 12.

[0077] Specifically, Figure 2-4 and Figure 6 As shown, the lap groove 221 is in a frustum shape, and the large end of the lap groove 221 is close to the outer shell 11; the sealing ring group includes a second frustum-shaped sealing ring 232, which is sleeved on the outer periphery of the core rod portion 242, and the large end of the second frustum-shaped sealing ring 232 is close to the outer shell 11, and the second frustum-shaped sealing ring 232 is used to seal the gap between the bottom wall of the lap portion 241, the outer peripheral wall of the core rod portion 242, the inner bottom wall of the lap groove 221, and the inner peripheral wall of the lap groove 221. So that the external high-temperature gasified medium cannot flow through the gap between the bottom wall of the lap portion 241, the outer peripheral wall of the core rod portion 242, the inner bottom wall of the lap groove 221, and the inner peripheral wall of the lap groove 221 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24. It can be understood that the inner ring of the second frustum-shaped sealing ring 232 is cylindrical, and the outer ring of the second frustum-shaped sealing ring 232 is frustum-shaped.

[0078] Preferably, if Figure 2-4 and Figure 6 As shown, the sealing ring assembly also includes a third frustoconical sealing ring 233, which is sleeved on the outer periphery of the overlap portion 241, and the large end of the third frustoconical sealing ring 233 is close to the outer shell 11. The third frustoconical sealing ring 233 is used to seal the gap between the outer peripheral wall of the overlap portion 241, the second frustoconical sealing ring 232 and the inner peripheral wall of the overlap groove 221. This prevents the external high-temperature gasified medium from flowing through the gap between the outer peripheral wall of the overlap portion 241, the second frustoconical sealing ring 232 and the inner peripheral wall of the overlap groove 221 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24. It can be understood that the inner ring and the outer ring of the third frustoconical sealing ring 233 are both frustoconical.

[0079] It is understandable that if Figure 2-4 and Figure 6 As shown, the second frustum-shaped sealing ring 232 and the third frustum-shaped sealing ring 233 cooperate to prevent the external high-temperature gasified medium from flowing from the gap between the overlapping portion 241 and the overlapping groove 221 to the connection between the primary waveguide core rod 13 and the secondary waveguide core rod 24.

[0080] Preferably, in this embodiment, the second frustum-shaped sealing ring 232 is a graphite sealing ring. The third frustum-shaped sealing ring 233 is a graphite sealing ring.

[0081] Preferably, the overlap portion 241 and the core rod portion 242 of the secondary waveguide core rod 24 are integrally formed, which can reduce the number of parts, facilitate assembly, and improve the structural strength and working performance of the secondary waveguide core rod 24.

[0082] Among them, Figure 2-6As shown, the pressure-bearing shell 21 is provided with a threaded through hole 213 communicating with the installation space 211, and the outer shell 11 is provided with a first threaded connection portion 111, and the first threaded connection portion 111 is threadedly connected to the threaded through hole 213 and can be tightly pressed against the large end face of the secondary insulating support tube 22, the large end face of the first frustum-shaped sealing ring 231, and the secondary waveguide core rod 24. Specifically, the first threaded connection portion 111 is threadedly connected to the threaded through hole 213 and can be tightly pressed against the large end face of the secondary insulating support tube 22, the large end face of the first frustum-shaped sealing ring 231, the end face of the core rod portion 242 close to the primary waveguide core rod 13, and the large end face of the third frustum-shaped sealing ring 233. Such arrangement enables the outer shell 11 and the pressure shell 21 to be detachably connected; secondly, the installation space 211, the secondary insulating support tube 22, the first frustum-shaped sealing ring 231, the second frustum-shaped sealing ring 232, the third frustum-shaped sealing ring 233 and the overlap portion 241 are all frustum-shaped, and along the length direction of the outer shell 11, the large end of the installation space 211, the large end of the secondary insulating support tube 22, the large end of the first frustum-shaped sealing ring 231, the large end of the second frustum-shaped sealing ring 232, the large end of the third frustum-shaped sealing ring 233 and the overlap portion 241 are all frustum-shaped. The large end of the conical sealing ring 233 and the large end of the overlapping portion 241 are both close to the outer shell 11. When the first threaded connection portion 111 is pressed against the large end face of the secondary insulating support tube 22, the large end face of the first conical sealing ring 231, the end face of the core rod portion 242 close to the primary waveguide core rod 13 and the large end face of the third conical sealing ring 233, the secondary insulating support tube 22 presses the first conical sealing ring 231 against the inner wall of the installation space 211 along the circumferential direction, and the first conical sealing ring 231 is pressed against the inner wall of the installation space 211. The second cone-shaped sealing ring 231 is squeezed and deformed, so that the first cone-shaped sealing ring 231 can effectively seal the gap between the outer peripheral wall of the secondary insulating support tube 22 and the inner peripheral wall of the installation space 211, and the overlapping portion 241 presses the second cone-shaped sealing ring 232 circumferentially to the outer peripheral wall of the core rod portion 242, the inner bottom wall of the overlapping groove 221 and the inner peripheral wall of the overlapping groove 221, and the overlapping portion 241 presses the third cone-shaped sealing ring 233 circumferentially to the inner peripheral wall of the overlapping groove 221. The three-cone shaped sealing ring 233 is squeezed and deformed, so that the second conical sealing ring 232 and the third conical sealing ring 233 cooperate to effectively seal the gap between the inner wall of the lap groove 221 and the lap part 241; secondly, it can be understood that when the first threaded connection part 111 is screwed away from the pressure-bearing shell 21, it is convenient to disassemble the first conical sealing ring 231, the second conical sealing ring 232, the third conical sealing ring 233, the secondary insulating support tube 22 and the secondary waveguide core rod 24.

[0083] Preferably, if Figure 2 , Figure 3 and Figure 5As shown, the aperture of the threaded through hole 213 is larger than the diameter of the large end of the installation space 211, and the connection between the threaded through hole 213 and the installation space 211 forms a lap joint 214; the secondary waveguide assembly 2 also includes an insulating clamping ring 25, which is distributed in the threaded through hole 213, and the primary waveguide core rod 13 passes through the insulating clamping ring 25 and is detachably connected to the secondary waveguide core rod 24, and the first threaded connection portion 111 can drive the insulating clamping ring 25 to press against the lap joint 214, the large end face of the secondary insulating support tube 22, the large end face of the first frustum-shaped sealing ring 231, and the secondary waveguide core rod 24. Specifically, the first threaded connection portion 111 can drive the insulating clamping ring 25 to press against the lap joint 214, the large end face of the secondary insulating support tube 22, the large end face of the first frustum-shaped sealing ring 231, the large end face of the third frustum-shaped sealing ring 233, and the end face of the core rod portion 242 close to the primary waveguide core rod 13. In this way, when the first threaded connection portion 111 presses the insulating clamping ring 25 against the overlapping surface 214, the secondary insulating support tube 22 presses the first cone-shaped sealing ring 231 against the inner wall of the installation space 211 along the circumferential direction, and the large end surface of the first cone-shaped sealing ring 231 is also in close contact with the insulating clamping ring 25, which can further prevent external gas from flowing into the guided wave radar level gauge in sequence through the threaded connection between the outer shell 11 and the pressure shell 21, and the gap between the insulating clamping ring 25 and the overlapping surface 214, thereby further improving the sealing performance of the secondary sealing assembly 23; the first threaded connection portion 111 presses the insulating clamping ring 25 against the overlapping surface When the overlap surface 214 is formed, the overlapping portion 241 presses the second conical sealing ring 232 circumferentially against the outer circumferential wall of the core rod portion 242, the inner bottom wall of the overlapping groove 221 and the inner circumferential wall of the overlapping groove 221, and the overlapping portion 241 presses the third conical sealing ring 233 circumferentially against the inner circumferential wall of the overlapping groove 221, and the large end face of the third conical sealing ring 233 is also in close contact with the insulating clamping ring 25, which can further prevent external gas from flowing into the guided wave radar level gauge in sequence through the threaded connection between the outer shell 11 and the pressure shell 21, and the gap between the insulating clamping ring 25 and the overlapping surface 214, thereby further improving the sealing performance of the secondary sealing assembly 23.

[0084] It can be understood that the first cone-shaped sealing ring 231 and the third cone-shaped seal form a secondary seal for the gap at the threaded connection between the outer shell 11 and the pressure shell 21, and the gap between the insulating clamping ring 25 and the lap surface 214. This further improves the performance and service life of the guided wave radar level gauge.

[0085] Preferably, in this embodiment, the primary insulating support tube 12 is a ceramic insulating support tube, the secondary insulating support tube 22 is a ceramic insulating support tube, and the insulating clamping ring 25 is a ceramic insulating clamping ring.

[0086] Among them, Figure 2 , Figure 3 and Figure 6 As shown, a first threaded blind hole 243 is recessed at one end of the secondary waveguide core rod 24 along the length direction, and an external thread is provided on the primary waveguide core rod 13, which is threadedly connected with the first threaded blind hole 243. Figure 2 , Figure 3 and Figure 6 As shown, a first threaded blind hole 243 is recessed on the end surface of the core rod portion 242 close to the primary waveguide core rod 13. This arrangement enables the primary waveguide core rod 13 and the secondary waveguide core rod 24 to be detachably connected.

[0087] Among them, Figure 1 and Figure 2 As shown, the waveguide radar level gauge further includes a nut connector 4, which is used to detachably connect the outer shell 11 to the radar level gauge body; a conductive pin 41 is arranged in the nut connector 4, and a slot is recessed on one end surface of the primary waveguide core rod 13 away from the secondary waveguide core rod 24, and the conductive pin 41 is inserted into the slot and electrically connected to the radar level gauge body. This arrangement enables the outer shell 11 to be detachably connected to the radar level gauge body, and the primary waveguide core rod 13 to be electrically connected to the radar level gauge body.

[0088] Specifically, Figure 1 and Figure 2 As shown, the outer shell 11 is further provided with a second threaded connection portion 113, and along the length direction of the outer shell 11, the first threaded connection portion 111 and the second threaded connection portion 113 are respectively located at both ends of the plurality of heat dissipation fins 112; the nut connector 4 is provided with a second threaded blind hole, and the second threaded connection portion 113 and the second threaded blind hole are threadedly connected. This arrangement enables the outer shell 11 and the nut connector 4 to be detachably connected.

[0089] Preferably, a third sealing ring is provided at the threaded connection between the second threaded connection portion 113 and the second threaded blind hole, and the third sealing ring is used to seal the gap at the threaded connection between the second threaded connection portion 113 and the second threaded blind hole.

[0090] Specifically, Figure 1-7As shown, when assembling the waveguide radar level gauge, the second cone-shaped sealing ring 232 and the third cone-shaped sealing ring 233 are placed in the overlapping groove 221 in sequence, the core rod portion 242 of the secondary waveguide core rod 24 is passed through the secondary insulating support tube 22 and the overlapping portion 241 is overlapped in the overlapping groove 221; the first cone-shaped sealing ring 231 is placed in the installation space 211, and then the second cone-shaped sealing ring 232, the third cone-shaped sealing ring 233, the secondary waveguide core rod 24 and the secondary insulating support tube 22 are assembled as a whole in the pressure-bearing shell 21; the insulating clamping ring 25 is placed in the threaded through hole 213; the primary insulating support tube 12 is inserted into the outer shell 11, so that the second sealing ring 15 is sealed. The first-level waveguide core rod 13 is inserted into the first-level insulating support tube 12 and is threadedly connected with the core rod portion 242 of the second-level waveguide core rod 24 through the insulating clamping ring 25, so that the first sealing ring 14 seals the gap between the inner circumferential wall of the first-level insulating support tube 12 and the outer circumferential wall of the first-level waveguide core rod 13, and then the outer shell 11 is threadedly connected with the pressure-bearing shell 21, so that the first threaded connection portion 111 of the outer shell 11 is pressed against the insulating clamping ring 25; the nut connector 4 is connected to the outer shell 11, so that the conductive needle 41 is inserted into the slot, and the third sealing ring seals the gap between the second threaded connection portion 113 and the second threaded blind hole.

[0091] Among them, the specific structure of the radar level meter body belongs to the existing technology and will not be repeated here.

[0092] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Guided wave radar level meter, characterized in that: include: Radar level gauge body; A primary waveguide assembly (1), the primary waveguide assembly (1) comprising an outer shell (11), a primary insulating support tube (12) inserted into the outer shell (11), and a primary waveguide core rod (13) inserted into the primary insulating support tube (12), one end of the outer shell (11) along the length direction can be detachably connected to the radar level meter body, and one end of the primary waveguide core rod (13) along the length direction can be electrically connected to the radar level meter body; A secondary waveguide assembly (2), the secondary waveguide assembly (2) comprising a pressure-bearing shell (21), a secondary insulating support tube (22), a secondary sealing assembly (23) and a secondary waveguide core rod (24), the other end of the outer shell (11) along the length direction is detachably connected to the pressure-bearing shell (21), and an installation space (211) is formed between the outer shell (11) and the pressure-bearing shell (21), the secondary insulating support tube (22) and the secondary sealing assembly (23) are both distributed in the installation space (211), the other end of the primary waveguide core rod (13) along the length direction extends into the installation space (211) and is detachably connected to one end of the secondary waveguide core rod (24) along the length direction, and the end of the secondary waveguide core rod (24) detachably connected to the primary waveguide core rod (13) is overlapped with the secondary insulating support tube (22); the other end of the secondary waveguide core rod (24) along the length direction passes through the secondary insulating support tube (22) and extends out of the pressure-bearing shell (21); The secondary sealing assembly (23) is configured to be able to seal the gap between the outer wall of the secondary insulating support tube (22) and the inner wall of the installation space (211), and to be able to seal the gap between the overlapping part of the secondary waveguide core rod (24) and the secondary insulating support tube (22).

2. The guided wave radar level meter according to claim 1, characterized in that: The installation space (211) and the secondary insulation support tube (22) are both in a frustum shape, and the large end of the installation space (211) and the large end of the secondary insulation support tube (22) are both close to the outer shell (11); The secondary sealing assembly (23) comprises a first frustoconical sealing ring (231) sleeved on the outer circumference of the secondary insulating support tube (22), the large end of the first frustoconical sealing ring (231) being close to the outer shell (11), and the first frustoconical sealing ring (231) being used to seal the gap between the outer circumferential wall of the secondary insulating support tube (22) and the inner circumferential wall of the installation space (211).

3. The guided wave radar level gauge according to claim 1, characterized in that: The secondary waveguide core rod (24) comprises a lap joint portion (241) and a core rod portion (242); the lap joint portion (241) is arranged around the outer periphery of the core rod portion (242) and distributed at one end of the core rod portion (242) along the length direction; the core rod portion (242) is detachably connected to the primary waveguide core rod (13); Along the length direction of the outer shell (11), the end surface of the secondary insulating support tube (22) close to the outer shell (11) is concavely provided with a lap groove (221), the bottom wall of the lap groove (221) is provided with a first through hole (222), the pressure-bearing shell (21) is further provided with a second through hole (212) connected to the installation space (211), the lap portion (241) is lapped on the lap groove (221), and the core rod portion (242) passes through the first through hole (222) and the second through hole (212) and protrudes out of the pressure-bearing shell (21); The secondary sealing assembly (23) further comprises a sealing ring assembly, which is used to seal the gap between the inner wall of the overlapping groove (221) and the overlapping portion (241).

4. The guided wave radar level gauge according to claim 3, characterized in that: The overlapping groove (221) is in a frustum shape, and the large end of the overlapping groove (221) is close to the outer shell (11); The sealing ring group comprises a second frustoconical sealing ring (232), the second frustoconical sealing ring (232) being sleeved on the outer periphery of the core rod portion (242), the large end of the second frustoconical sealing ring (232) being close to the outer shell (11), and the second frustoconical sealing ring (232) being used for sealing the gap between the bottom wall of the lap joint portion (241), the outer peripheral wall of the core rod portion (242), the inner bottom wall of the lap joint groove (221) and the inner peripheral wall of the lap joint groove (221).

5. The guided wave radar level gauge according to claim 4, characterized in that: The sealing ring group also includes a third frustoconical sealing ring (233), which is sleeved on the outer periphery of the overlapping portion (241), and the large end of the third frustoconical sealing ring (233) is close to the outer shell (11). The third frustoconical sealing ring (233) is used to seal the gap between the outer peripheral wall of the overlapping portion (241), the second frustoconical sealing ring (232) and the inner peripheral wall of the overlapping groove (221).

6. The guided wave radar level gauge according to claim 2, characterized in that: The pressure-bearing shell (21) is provided with a threaded through hole (213) communicating with the installation space (211), and the outer shell (11) is provided with a first threaded connection portion (111), the first threaded connection portion (111) being threadedly connected to the threaded through hole (213) and being able to be tightly pressed against the large end surface of the secondary insulating support tube (22), the large end surface of the first frustum-shaped sealing ring (231) and the secondary waveguide core rod (24).

7. The guided wave radar level gauge according to claim 6, characterized in that: The diameter of the threaded through hole (213) is larger than the diameter of the large end of the installation space (211), and a lap joint (214) is formed at the connection point between the threaded through hole (213) and the installation space (211); The secondary waveguide assembly (2) further comprises an insulating clamping ring (25), wherein the insulating clamping ring (25) is distributed in the threaded through hole (213), the primary waveguide core rod (13) passes through the insulating clamping ring (25) and is detachably connected to the secondary waveguide core rod (24), and the first threaded connection portion (111) can drive the insulating clamping ring (25) to press against the overlapping surface (214), the large end surface of the secondary insulating support tube (22), the large end surface of the first frustum-shaped sealing ring (231) and the secondary waveguide core rod (24).

8. The guided wave radar level gauge according to any one of claims 1 to 5, characterized in that: A first threaded blind hole (243) is recessed at one end of the secondary waveguide core rod (24) along the length direction, and the primary waveguide core rod (13) is provided with an external thread, which is threadedly connected to the first threaded blind hole (243).

9. The guided wave radar level gauge according to any one of claims 1 to 5, characterized in that: The primary waveguide assembly (1) further comprises a primary sealing assembly, wherein the primary sealing assembly comprises a first sealing ring (14), and along the length direction of the outer shell (11), the first sealing ring (14) is distributed on an end of the primary waveguide core rod (13) away from the secondary waveguide core rod (24); The first-level insulating support tube (12) is cylindrical in shape, and the first sealing ring (14) is partially embedded in the inner peripheral wall of the first-level insulating support tube (12) or the outer peripheral wall of the first-level waveguide core rod (13). The first sealing ring (14) is used to seal the gap between the inner peripheral wall of the first-level insulating support tube (12) and the outer peripheral wall of the first-level waveguide core rod (13).

10. The guided wave radar level gauge according to claim 9, characterized in that: The primary sealing assembly further comprises a second sealing ring (15), and along the length direction of the outer shell (11), the second sealing ring (15) is distributed on an end of the primary waveguide core rod (13) away from the secondary waveguide core rod (24); The second sealing ring (15) is partially embedded in the outer peripheral wall of the primary insulating support tube (12) or the inner peripheral wall of the outer shell (11), and the second sealing ring (15) is used to seal the gap between the outer peripheral wall of the primary insulating support tube (12) and the inner peripheral wall of the outer shell (11).

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