Guided wave radar liquid level meter

Abstract

The guided wave radar liquid level meter comprises a liquid level meter body and a wave guiding mechanism, the wave guiding mechanism comprises an outer pipe, a wave guiding piece and a supporting assembly, the upper end of the wave guiding piece is fixedly connected with the liquid level meter body, the lower end of the wave guiding piece extends into a container, and the outer pipe is configured to be of a communicating vessel structure so that a liquid medium in the container can enter an inner cavity of the outer pipe at the same liquid level; the wave guide piece is arranged in an inner cavity of the outer pipe in the axial direction, is electrically connected with the liquid level meter main body and is used for transmitting radar waves emitted by the liquid level meter main body; the supporting assemblies are axially arranged between the outer pipe and the wave guide part at intervals; wherein the supporting assemblies are arranged at intervals of 25-35 cm in the axial direction, and at least one supporting assembly comprises two sets of supporting structures which are adjacently arranged in the axial direction. According to the guide wave radar liquid level meter, more supporting structures are arranged in the axial direction, the limiting effect on the wave guide piece is better, the resonance degree is reduced, abrasion of the supporting assembly is relieved, the detection accuracy and use reliability of the guide wave radar liquid level meter are improved, and the service life of the guide wave radar liquid level meter is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level measuring device technical field especially relates to a waveguide radar liquid level meter. BACKGROUND

[0002] The waveguide radar liquid level meter is used for measuring the liquid level height of liquid medium in a container, and comprises a liquid level meter body for releasing radar waves and a waveguide mechanism for transmitting and reflecting radar waves to realize liquid level measurement. The drain tank of the GSS system (steam-water separation and reheating system) of a nuclear power plant generally uses a waveguide radar liquid level meter for liquid level measurement. The waveguide mechanism at least partially extends into the drain tank and comprises a waveguide and an outer tube. Radar waves propagate along the waveguide, produce a return wave when encountering liquid medium, and return. The liquid level meter body calculates the actual liquid level height in the drain tank according to the return time of the return wave.

[0003] The waveguide mechanism of the existing waveguide radar liquid level meter is provided with a set of support components every 60 cm or so in the axial direction to isolate the waveguide from the outer tube and ensure that the waveguide and the outer tube are insulated. The waveguide will gradually wear out the support components due to resonance in a high-temperature and high-pressure vibration environment. When the wear is severe, the waveguide will lose local support and approach or even contact the inner wall of the outer tube. The radar wave will return at the contact point before reaching the actual liquid surface, which will not only cause a false high liquid level in the measurement result, but also cause the gap near the top steam target to shrink due to the waveguide approaching the inner wall of the outer tube, which will further easily cause the turbine to trip and lose power generation. SUMMARY

[0004] To solve the above technical problems, the present application provides a waveguide radar liquid level meter, which solves the technical problem that the waveguide of the existing waveguide radar liquid level meter is easy to approach or contact the inner wall of the outer tube due to local loss of support. The waveguide radar liquid level meter provided by the present application has more support structures in the axial direction, better limits the waveguide, reduces the degree of resonance, alleviates the wear of the support components, prolongs the service life of the support components, and reduces the risk of the waveguide losing local support and approaching the inner wall of the outer tube.

[0005] The present application provides a waveguide radar liquid level meter for detecting the liquid level of liquid medium in a container, which comprises a liquid level meter body and a waveguide mechanism. The waveguide mechanism comprises:

[0006] An outer tube is fixedly connected to the liquid level meter body at the end in the direction of gravity and at least partially extends into the container. The outer tube is configured as a communicating vessel structure to allow the liquid medium in the container to enter the inner cavity of the outer tube at the same level.

[0007] A waveguide is arranged in the inner cavity of the outer tube in the axial direction and electrically connected to the liquid level meter body. The waveguide is used for transmitting radar waves emitted by the liquid level meter body.

[0008] The guided wave radar liquid level meter further comprises:

[0009] A support assembly is arranged axially between the outer tube and the waveguide, and is configured to isolate the waveguide from the inner wall of the outer tube and allow the liquid medium to pass through; wherein the support assembly is arranged in groups of 25-35 cm axially, and at least one group of the support assembly comprises two sets of support structures arranged axially adjacent to each other.

[0010] In some embodiments, each set of the support structures comprises:

[0011] At least three ceramic balls are arranged uniformly in the circumferential direction between the outer tube and the waveguide, and are at least partially in contact with the outer wall of the waveguide and at least partially clamped to the tube wall of the outer tube.

[0012] In some embodiments, the ceramic balls are at least partially exposed to the tube wall of the outer tube.

[0013] Each set of the support structures further comprises:

[0014] A first fixing member is fixedly arranged outside the tube wall of the outer tube, and the part of the ceramic balls exposed to the tube wall of the outer tube is in contact with the first fixing member.

[0015] In some embodiments, the first fixing member has a receiving cavity, and the part of the ceramic balls exposed to the tube wall of the outer tube is in contact with the inner wall of the receiving cavity in the radial direction.

[0016] The upper end of the first fixing member in the direction of gravity is arranged as a closed structure, and the lower end of the first fixing member in the direction of gravity is arranged as an open structure in communication with the receiving cavity.

[0017] In some embodiments, each set of the support structures further comprises:

[0018] An elastic member is arranged around at least part of the inner wall of the receiving cavity, and is configured to elastically press the ceramic balls to make them tightly contact the waveguide.

[0019] In some embodiments, the inner wall of the receiving cavity is arranged as a flared structure extending downward in the direction of gravity.

[0020] In some embodiments, each set of the support structures further comprises:

[0021] At least three clamping holes are arranged uniformly in the circumferential direction on the tube wall of the outer tube and are clamped one-to-one with the ceramic balls; the diameter of the clamping hole is smaller than the diameter of the ceramic ball.

[0022] In some embodiments, the waveguide mechanism further comprises:

[0023] a flexible connecting structure fixedly connected between the outer tube and the gravity direction lower end of the waveguide, the flexible connecting structure being configured to limit the relative movement of the waveguide and the outer tube and to reflect the radar wave as zero liquid level when the container is emptied.

[0024] In some embodiments, the waveguide radar liquid level meter further comprises:

[0025] a second fixing member fixedly arranged outside the tube wall of the gravity direction lower end of the outer tube and cooperatively clamped with the positioning structure arranged in the container, the second fixing member being configured to position the end of the outer tube and limit the vibration of the outer tube.

[0026] In some embodiments, the gravity direction lower ends of the outer tube and the waveguide are concentrically and flushly arranged;

[0027] wherein the gravity direction lower end of the outer tube is arranged as an open structure, and the tube wall of the outer tube is axially spaced apart with at least two communication holes communicating the inner cavity and the external space.

[0028] The waveguide radar liquid level meter provided by the present application improves the waveguide mechanism, which comprises an outer tube and a waveguide. A set of support assemblies is arranged every 25-35 cm in the axial direction between the outer tube and the waveguide. At least one set of support assemblies comprises two sets of support structures arranged in close proximity in the axial direction. This not only reduces the distance between the two adjacent sets of support assemblies and doubles the arrangement density of the support assemblies in the axial direction, but also doubles the number of support structures in at least one set of support assemblies. As a result, the waveguide mechanism has more support structures and higher arrangement density, the limiting effect on the waveguide is better, the resonance degree of the waveguide is reduced, the wear of the support assemblies is greatly alleviated, the service life of the support assemblies is significantly improved, and the risk of the waveguide losing support locally and sticking to the inner wall of the outer tube is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] The technical solutions of the present application will be further described below in combination with the drawings and embodiments. In the drawings:

[0030] Figure 1 is a schematic diagram of the combined structure of the waveguide radar liquid level meter of the present application installed in a container;

[0031] Figure 2 is a schematic diagram of the vertical cross-sectional structure of one embodiment of the waveguide radar liquid level meter of the present application;

[0032] Figure 3 is Figure 2 is an enlarged schematic diagram of the local structure at A in

[0033] Figure 4 is a bottom view structural schematic diagram of the end in the direction of gravity of one embodiment of the application.

[0034] The reference signs are as follows:

[0035] 100 - guided wave radar liquid level meter; 200 - container, 201 - mounting flange, 202 - positioning structure; 300 - liquid medium;

[0036] 10 - liquid level meter body; 20 - guided wave mechanism, 30 - support assembly, 31 - support structure, 40 - connecting flange;

[0037] 1 - outer tube, 11 - communication hole, 2 - guided wave piece, 3 - ceramic ball, 4 - first fixing piece, 41 - containing cavity, 5 - elastic piece, 6 - flexible connection structure, 7 - second fixing piece, 71 - hollow structure. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and effect of the utility model more clear and definite, the following will make further detailed description on the technical scheme of the utility model through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0039] Please refer to Figure 1 and Figure 2 , the application provides a guided wave radar liquid level meter 100 for detecting the liquid level of a liquid medium 300 in a container 200, the guided wave radar liquid level meter 100 comprising a liquid level meter body 10, a guided wave mechanism 20, and a support assembly 30, the guided wave mechanism 20 comprising an outer tube 1 and a guided wave piece 2, the upper end of the outer tube 1 in the direction of gravity being fixedly connected to the liquid level meter body 10, the lower end of the outer tube 1 in the direction of gravity at least partially extending into the container 200, the outer tube 1 being configured as a communication structure to allow the liquid medium 300 in the container 200 to enter the inner cavity of the outer tube 1 at the same liquid level.

[0040] The outer tube 1 can be made of a stainless steel round tube, and the guided wave piece 2 can be a metal straight rod arranged in the inner cavity of the outer tube 1 in the axial direction and electrically connected to the liquid level meter body 10, for transmitting radar waves emitted by the liquid level meter body 10.

[0041] The support assembly 30 is arranged in the axial direction between the outer tube 1 and the guided wave piece 2, the support assembly 30 being configured to isolate the guided wave piece 2 from the inner wall of the outer tube 1 and allow the liquid medium 300 to pass through. Among them, the support assembly 30 is arranged in the axial direction every 25cm-35cm, and at least one set of support assembly 30 comprises two sets of support structures 31 arranged in the axial direction.

[0042] The container 200 in the following embodiment is taken as an example of a drain tank in a GSS system of a nuclear power plant. The drain tank is vertically installed, and a mounting flange 201 is arranged at the upper end of the drain tank in the direction of gravity. The waveguide mechanism 20 of the guided wave radar liquid level meter 100 extends into the drain tank at least partially via the mounting flange 201 in the axial direction, and the lower end of the waveguide mechanism 20 is close to the bottom surface of the drain tank, away from the liquid level meter body 10. The liquid level meter body 10 is outside the upper end of the mounting flange 201, and the upper end of the waveguide mechanism 20 is fixedly connected with a connecting flange 40. The connecting flange 40 is fixedly connected to the mounting flange 201 by fasteners (not shown in the figure), thereby achieving fixation of the guided wave radar liquid level meter 100.

[0043] In use, the liquid medium 300 in the drain tank enters the inner cavity of the outer tube 1 at the same liquid level, the liquid level meter body 10 releases radar waves (electromagnetic waves) outward, the radar waves propagate along the waveguide 2, encounter the liquid surface of the liquid medium 300, generate a return wave and return, and the liquid level meter body 10 calculates the actual liquid level height in the drain tank according to the return time of the return wave.

[0044] The guided wave radar liquid level meter 100 provided in the present application improves the waveguide mechanism 20. The waveguide mechanism 20 includes the outer tube 1 and the waveguide 2, and a set of support assemblies 30 is arranged every 25-35 cm in the axial direction between the outer tube 1 and the waveguide 2. At least one set of support assemblies 30 includes two sets of support structures 31 arranged in close proximity in the axial direction. This not only reduces the spacing between the adjacent two sets of support assemblies 30 and doubles the arrangement density of the support assemblies 30 in the axial direction, but also doubles the number of support structures 31 in at least one set of support assemblies 30, so that the waveguide mechanism 20 has more support structures 31 and a higher arrangement density, the limiting effect on the waveguide 2 is better, the resonance degree of the waveguide 2 is reduced, the wear of the support assemblies 30 is greatly alleviated, the service life of the support assemblies 30 is significantly improved, and the risk of local loss of support of the waveguide 2 and adhesion to the inner wall of the outer tube 1 is reduced.

[0045] The guided wave radar liquid level meter 100 provided in the present application avoids false high liquid level of the measurement result, improves the liquid level detection accuracy, and also avoids the problem of narrowing of the gap near the top steam target caused by local adhesion of the waveguide 2 to the inner wall of the outer tube 1, significantly reduces the risk of turbine trip during operation of the nuclear power unit, ensures normal operation of the nuclear power equipment, improves the reliability of the equipment, and reduces the operation and maintenance cost of the nuclear power equipment.

[0046] Please refer to Figures 3-4In some embodiments, each set of support structure 31 includes at least three ceramic balls 3, which are uniformly arranged between the outer tube 1 and the waveguide 2 in the circumferential direction, and are at least partially in contact with the outer wall of the waveguide 2 and at least partially clamped to the wall of the outer tube 1. In this embodiment, the support assembly 30 is arranged every 30 cm in the axial direction, and each set of support structure 31 is taken as an example including three ceramic balls 3. The three ceramic balls 3 are uniformly distributed around the central axis of the outer tube 1 at an angle of 120°, so that each ceramic ball 3 can be in contact with the waveguide 2 in the middle from the outside with equal spacing, supporting and isolating the waveguide 2, ensuring that the waveguide 2 is always at the axis of the outer tube 1, preventing the waveguide 2 from losing local support and sticking to the inner wall of the outer tube 1, and improving the reliability of the waveguide radar liquid level meter 100.

[0047] In other embodiments, each set of support structure 31 can also include more than three ceramic balls 3, which are not limited in this application, as long as they can support the waveguide 2 and prevent the waveguide 2 from sticking to the inner wall of the outer tube 1.

[0048] Please refer to Figure 2 In some embodiments, the support assembly 30 near the lower end of the gravity direction of the waveguide mechanism 20 is arranged to include only one set of support structure 31, and the remaining support assemblies 30 are arranged to include two sets of support structure 31 arranged adjacent in the axial direction.

[0049] The two sets of support structure 31 enable the corresponding support assembly 30 to support the waveguide 2 in the form of upper and lower double ceramic balls. Compared with the form of single-layer ceramic ball support, the waveguide radar liquid level meter 100 of the present application can provide more support points for the waveguide 2, and the positioning of the waveguide 2 is more stable and not easy to shake. Moreover, the support assembly 30 supports the waveguide 2 in the form of upper and lower double ceramic balls, so even if the ceramic balls 3 in the upper layer are worn, the ceramic balls 3 in the lower layer can still play a supporting role, making the structure inside the waveguide mechanism 20 more stable, the wear of the ceramic balls 3 is smaller under the same working conditions and operating time, and the service life is doubled.

[0050] In other embodiments, the two groups of support assemblies 30 near the upper end of the gravity direction of the waveguide mechanism 20 and near the lower end of the gravity direction of the waveguide mechanism 20 can be arranged to include only one set of support structure 31, and the middle groups of support assemblies 30 are arranged to include two sets of support structure 31 arranged adjacent in the axial direction; or each group of support assemblies 30 can be arranged to include two sets of support structure 31 arranged adjacent in the axial direction, which is not limited in this application and can be adjusted accordingly according to the actual situation.

[0051] In some embodiments, the distance between the support assembly 30 near the upper end of the gravity direction of the waveguide mechanism 20 and the connecting flange 40 can be set to 10-25 cm, the distance between the support assembly 30 near the upper end of the gravity direction of the waveguide mechanism 20 and the bottom end of the waveguide mechanism 20 can be set to 5-10 cm, and the distance between the two sets of support structures 31 of the same support assembly 30 arranged in close proximity in the axial direction can be set to 0.5-2 cm.

[0052] Referring to Figures 3-4 In some embodiments, the ceramic balls 3 are at least partially exposed to the pipe wall of the outer pipe 1.

[0053] Each set of support structures 31 further comprises a first fixing member 4 fixedly sleeved outside the pipe wall of the outer pipe 1, and the part of the ceramic balls 3 exposed to the pipe wall of the outer pipe 1 is in active abutment with the first fixing member 4.

[0054] The first fixing member 4 abuts the ceramic balls 3 from the outside of the outer pipe 1, thereby forming an outer side support and limiting for the ceramic balls 3, preventing the ceramic balls 3 from separating from the waveguide mechanism 20, while urging each ceramic ball 3 to tightly abut the waveguide 2 in the radial direction, thereby achieving support and isolation for the waveguide 2, and ensuring that the waveguide 2 is always on the same axis as the central axis of the outer pipe 1.

[0055] Referring to Figures 3-4 In some embodiments, the first fixing member 4 has a receiving cavity 41, and the part of the ceramic balls 3 exposed to the pipe wall of the outer pipe 1 is stopped in the radial direction by the inner wall of the receiving cavity 41.

[0056] The upper end of the first fixing member 4 in the gravity direction is set as a closed structure, and the lower end of the first fixing member 4 in the gravity direction is set as an open structure in communication with the receiving cavity 41.

[0057] The receiving cavity 41 provides a partial receiving space for the part of the ceramic balls 3 exposed to the outer pipe 1, so that the inner wall of the receiving cavity 41 can abut the ceramic balls 3 from the outside in the radial direction, thereby ensuring that the three ceramic balls 3 of the same set of support structures 31 achieve support and isolation for the waveguide 2.

[0058] The upper end of the first fixing member 4 in the gravity direction is set as a closed structure, so that the first fixing member 4 can be tightly fitted and fixedly connected with the outer wall of the outer pipe 1 through the closed structure thereof; the lower end of the first fixing member 4 in the gravity direction is set as an open structure in communication with the receiving cavity 41, so that the condensed liquid formed in the receiving cavity 41 can automatically flow out from the open structure thereof, thereby avoiding the problem of false liquid level caused by the accumulation of condensed liquid in the receiving cavity 41 and the reflection of radar waves, further improving the measurement accuracy of the waveguide radar liquid level meter 100, and reducing the risk of turbine trip caused by inaccurate liquid level detection of the drain tank of the nuclear power unit equipment.

[0059] Referring to Figures 3-4In some embodiments, the first fixing member 4 can be provided as a cylindrical structure coaxial with the outer tube 1, the accommodating cavity 41 is axially arranged at the lower part of the first fixing member 4, and the upper part of the first fixing member 4 is axially provided with a through hole (not shown in the figure) communicating with the accommodating cavity 41, and the outer tube 1 coaxially passes through the through hole and the accommodating cavity 41. The diameter of the through hole is preferably matched with the outer diameter of the outer tube 1 to ensure that the end of the first fixing member 4 in the direction of gravity is a closed structure.

[0060] Referring to Figure 3 In some embodiments, each set of support structure 31 further comprises an elastic member 5, which is arranged around at least part of the inner wall of the accommodating cavity 41, and is configured to elastically extrude the ceramic ball 3 to make it tightly adhere to the waveguide 2.

[0061] The elastic member 5 can be made of flexible material and has elastic deformation and recovery capability. During use, the ceramic ball 3 will inevitably be worn due to resonance of the waveguide 2 and the outer tube 1, etc. As the degree of wear increases, the diameter of the ceramic ball 3 will gradually decrease. At this time, the elastic member 5 can elastically abut against the ceramic ball 3 by virtue of its elastic deformation and recovery characteristics, and adaptively change with the diameter of the ceramic ball 3, so as to ensure that the ceramic ball 3 can still play a supporting and isolating role for the waveguide 2 within a certain period of time after the diameter of the ceramic ball 3 decreases, thereby further prolonging the service life of the support structure 31.

[0062] In some embodiments, the elastic member 5 can be provided as a rubber layer or a silica gel layer with a certain thickness arranged continuously around the inner wall of the accommodating cavity 41, or can be provided as springs, reeds, etc. arranged at intervals around the inner wall of the accommodating cavity 41 and elastically connected with the corresponding ceramic balls 3 respectively. The present application does not limit this, as long as the elastic member 5 can elastically extrude the ceramic ball 3 and make it tightly adhere to the waveguide 2.

[0063] Referring to Figure 3 In some embodiments, the inner wall of the accommodating cavity 41 is provided as a flared structure extending towards the lower end in the direction of gravity. The flared structure herein refers to that the diameter of the inner wall of the accommodating cavity 41 near the lower end in the direction of gravity is greater than the diameter of the inner wall of the accommodating cavity 41 at the upper end in the direction of gravity. This structure makes it difficult for the condensed liquid to adhere to the inner wall of the accommodating cavity 41, and is beneficial for the condensed liquid to flow out of the open structure at the lower end in the direction of gravity of the accommodating cavity 41, thereby further reducing the risk of the condensed liquid gathering in the accommodating cavity 41.

[0064] In some embodiments, each set of support structure 31 further comprises at least three clamping holes (not shown in the figure), which are uniformly arranged on the wall of the outer tube 1 in the circumferential direction and are clamped one-to-one with the ceramic balls 3. The diameter of the clamping hole is smaller than the diameter of the ceramic ball 3.

[0065] The clamping hole is used for exposing at least part of the ceramic ball 3 outside the outer tube 1, the aperture of the clamping hole is smaller than the diameter of the ceramic ball 3, the positioning and limiting effect of the ceramic ball 3 are realized, and the ceramic ball 3 is prevented from being separated from the outer tube 1 while the ceramic ball 3 is uniformly arranged in the circumferential direction.

[0066] Please refer to Figure 2 and Figure 4 In some embodiments, the wave guide mechanism 20 further comprises a flexible connecting structure 6 fixedly connected between the outer tube 1 and the gravity direction lower end of the wave guide 2, the flexible connecting structure 6 is configured to limit the relative movement of the wave guide 2 and the outer tube 1, and serve as a zero liquid level reflection radar wave when the container 200 is empty.

[0067] The flexible connecting structure 6 can be made of a high-flexibility corrosion-resistant metal material and is fixedly connected between the outer tube 1 and the gravity direction lower end of the wave guide 2 by welding.

[0068] The bottom of the outer tube 1 of the wave guide mechanism 20 is generally designed as an open type, after the wave guide 2 is supported by the ceramic ball 3, in the empty state of the hydrophobic tank, the radar wave cannot detect the zero liquid level at the bottom, and the measurement of the bad point is prone to occur. This detection abnormality is more common after the nuclear power unit is drained, and is less common during the normal operation of the nuclear power unit, but still has a risk of occurrence, which is easy to cause the unit to trip.

[0069] In order to solve this problem, the wave radar liquid level meter 100 of the present application is provided with a flexible connecting structure 6 between the outer tube 1 and the gravity direction lower end of the wave guide 2, the wave guide 2 and the bottom of the outer tube 1 are fixed together by the flexible connecting structure 6, on the one hand, it ensures that the radar wave can detect the flexible connecting structure 6 at the bottom and normally display the zero liquid level, avoids the measurement of the bad point caused by the radar wave unable to detect the zero liquid level at the bottom, and reduces the risk of the nuclear power unit tripping. On the other hand, in the vibration environment, the flexible connecting structure 6 is used as a connection to limit the relative movement of the wave guide 2 and the outer tube 1, which plays a certain buffering role, is beneficial to reducing the wear of the bottom support assembly 30, and improves the service life and use reliability of the support assembly 30.

[0070] As a preferred, in order to ensure that the liquid medium 300 can enter the inner cavity of the outer tube 1 through the bottom of the outer tube 1 when the container 200 is in a low liquid level, realize the measurement of the low liquid level of the container 200, the flexible connecting structure 6 can be fixedly connected between the outer tube 1 and the wave guide 2 in the radial direction, and there is an aperture between the inner wall of the outer tube 1 and the flexible connecting structure 6 for the liquid medium 300 to pass through.

[0071] Please refer to Figure 2 and Figure 4In some embodiments, the guided wave radar liquid level meter 100 further comprises a second fixing member 7, which is fixedly arranged outside the pipe wall at the gravity direction lower end of the outer pipe 1, and is matched and clamped with the positioning structure 202 (as shown in Figure 1 The second fixing member 7 is configured to position the end of the outer pipe 1 part and limit the vibration of the outer pipe 1 part.

[0072] The second fixing member 7 can be made of stainless steel material, and the whole can be arranged in a circular shape and coaxially welded and fixed outside the lower end pipe wall of the outer pipe 1. In order to ensure that the liquid medium 300 can pass through the positioning structure 202, the second fixing member 7 and the bottom of the outer pipe 1 into the inner cavity of the outer pipe 1, a plurality of hollow structures 71 (as shown in Figure 4 The outer periphery of the second fixing member 7 can be closely attached to the inner wall surface of the positioning structure 202, realizing the positioning of the bottom of the guided wave radar liquid level meter 100, and limiting the vibration of the end of the outer pipe 1 through the cooperation of the second fixing member 7 and the positioning structure 202, further relieving the wear of the bottom support assembly 30, and improving the service life and use reliability of the support assembly 30.

[0073] Please refer to Figure 2 In some embodiments, the gravity direction lower end of the outer pipe 1 and the guided wave member 2 are concentrically and flushly arranged, avoiding the guided wave member 2 from being bumped out of the outer pipe 1, playing a role in protecting the guided wave member 2, and also avoiding the bottom of the guided wave member 2 from contacting the bottom surface of the container 200 to cause measurement error.

[0074] The gravity direction lower end of the outer pipe 1 is arranged as an open structure, and the pipe wall of the outer pipe 1 is axially spaced apart to be provided with at least two communication holes 11 which communicate the inner cavity and the outer space. This kind of structure design makes the liquid medium 300 at the bottom of the container 200 be able to enter the inner cavity of the outer pipe 1 through the open structure at the bottom of the outer pipe 1, so that the measurement depth of the guided wave radar liquid level meter 100 is as close to the bottom of the container 200 as possible. The cooperation of the communication hole 11 and the bottom open structure makes the outer pipe 1 constitute a communication device structure, ensuring that the liquid medium 300 in the container 200 can enter the outer pipe 1 at the same liquid level, and ensuring the accuracy of the measurement result.

[0075] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A guided wave radar level gauge for detecting a level of a liquid medium (300) in a vessel (200), comprising a level gauge body (10) and a guided wave mechanism (20), characterized in that, The waveguide mechanism (20) comprises: An outer tube (1) fixedly connected with the liquid level meter body (10) at the upper end in the direction of gravity, and at least partially inserted into the container (200) at the lower end in the direction of gravity, the outer tube (1) being configured as a communicating vessel structure for the liquid medium (300) in the container (200) to enter the inner cavity of the outer tube (1) at the same level; A waveguide (2) disposed in the inner cavity of the outer tube (1) in the axial direction and electrically connected with the liquid level meter body (10), for transmitting the radar waves emitted by the liquid level meter body (10); The waveguide radar liquid level meter further comprises: A support assembly (30) disposed in the axial direction between the outer tube (1) and the waveguide (2), the support assembly (30) being configured to isolate the waveguide (2) from the inner wall of the outer tube (1) and allow the liquid medium (300) to pass through; wherein the support assembly (30) is provided with a group of support structures (31) at an interval of 25-35 cm in the axial direction, and at least one group of the support assembly (30) comprises two sets of support structures (31) disposed in close proximity in the axial direction.

2. The guided wave radar level gauge according to claim 1, characterized in that Each set of the support structure (31) comprises: At least three ceramic balls (3) uniformly disposed in the circumferential direction between the outer tube (1) and the waveguide (2), and at least partially abutting against the outer wall of the waveguide (2) and at least partially clamped to the tube wall of the outer tube (1).

3. The guided wave radar level gauge according to claim 2, characterized in that The ceramic balls (3) are at least partially exposed to the tube wall of the outer tube (1); Each set of the support structure (31) further comprises: A first fixing member (4) fixedly sleeved outside the tube wall of the outer tube (1), and the portion of the ceramic balls (3) exposed to the tube wall of the outer tube (1) abutting against the first fixing member (4).

4. The guided wave radar level gauge according to claim 3, characterized in that The first fixing member (4) has a receiving cavity (41), and the portion of the ceramic balls (3) exposed to the tube wall of the outer tube (1) is stopped in the radial direction against the inner wall of the receiving cavity (41); The upper end of the first fixing member (4) in the direction of gravity is provided as a closed structure, and the lower end of the first fixing member (4) in the direction of gravity is provided as an open structure in communication with the receiving cavity (41).

5. The guided wave radar level gauge according to claim 4, characterized in that Each set of the support structure (31) further comprises: An elastic member (5) disposed around at least part of the inner wall of the receiving cavity (41) and configured to elastically press the ceramic balls (3) to make them tightly adhere to the waveguide (2).

6. The guided wave radar level gauge according to claim 4, characterized in that The inner wall of the receiving cavity (41) is provided as a flared structure extending downward in the direction of gravity.

7. The guided wave radar level gauge according to claim 3, characterized in that Each set of the support structure (31) further comprises: At least three clamping holes uniformly disposed in the circumferential direction on the tube wall of the outer tube (1) and clamped one-to-one with the ceramic balls (3); the clamping hole has a diameter smaller than the diameter of the ceramic ball (3).

8. The guided wave radar level gauge according to any one of claims 1 to 7, characterized in that The waveguide mechanism (20) further comprises: A flexible connecting structure (6) is fixedly connected between the gravity direction lower end of the outer tube (1) and the waveguide (2), and is configured to limit the relative movement of the waveguide (2) and the outer tube (1) and reflect the radar wave as zero liquid level when the container (200) is emptied.

9. The guided wave radar level gauge according to any one of claims 1 to 7, characterized in that Further comprising: A second fixing member (7) is fixedly arranged outside the tube wall of the gravity direction lower end of the outer tube (1) and is matched and clamped with the positioning structure (202) arranged in the container (200), and is configured to position the end of the outer tube (1) and limit the vibration of the outer tube (1).

10. The guided wave radar level gauge according to any one of claims 1 to 7, characterized in that The gravity direction lower ends of the outer tube (1) and the waveguide (2) are concentrically and flushly arranged; Wherein, the gravity direction lower end of the outer tube (1) is arranged as an open structure, and the tube wall of the outer tube (1) is axially spaced apart by at least two communication holes (11) which communicate the inner cavity and the external space.

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