Thermal power plant water tank liquid level measuring instrument

Abstract

The invention relates to the technical field of liquid level measurement, in particular to a thermal power plant water tank liquid level measuring instrument which comprises a measurement processing module, when the thermal power plant water tank liquid level measuring instrument is used, the high-low liquid level measurement contradiction caused by a fixed conical shielding cover can be effectively broken, and the measurement precision and stability are greatly improved. When the liquid level is low, the radar probe extends out of the conical shielding case, shielding of radar waves by the conical shielding case is thoroughly avoided, a measurement blind area is eliminated, and accurate capture of liquid level signals at the bottom of the water tank is ensured; when the liquid level is high, the radar probe is retracted into the conical shielding case, false echoes generated by components in the water tank are effectively blocked by the conical shielding case, and the signal identification accuracy is ensured; meanwhile, through the arrangement of an electric heating pipe and a humidity intelligent sensor, the environment humidity state can be monitored in real time, heating is automatically started when the water vapor condensation threshold value is reached, the surface temperature of the conical shielding cover is made to be higher than the dew point, water vapor condensation is reduced from the source, and the incrustation generation probability is reduced.

Description

Technical Field

[0001] This invention relates to the field of liquid level measurement technology, specifically to a liquid level measuring instrument for water tanks in thermal power plants. Background Technology

[0002] In thermal power plant production systems, water tanks are core equipment in critical processes such as thermal circulation, feedwater deoxygenation, and cooling. Accurate level measurement of these tanks directly impacts the safe and stable operation of the unit and energy efficiency. Existing level measuring instruments are diverse, mainly including float-type level gauges, differential pressure level gauges, ultrasonic level gauges, and radar level gauges. Due to the unique operating conditions commonly found in thermal power plant water tanks, such as high temperature and pressure, steam co-existence, water containing impurities, frequent fluctuations in operating conditions, and strong electromagnetic interference, conventional measuring instruments are insufficient to meet the requirements. Float-type level gauges are susceptible to scale buildup and aging seals; differential pressure level gauges are prone to errors due to condensation in the sampling tube; and ultrasonic level gauges are easily interfered with by steam and foam. Radar level gauges, however, employ non-contact measurement based on the principle of electromagnetic wave reflection. They are unaffected by the temperature, pressure, and composition of the medium, have strong anti-interference capabilities, and can penetrate steam and foam for stable measurement. Therefore, they have become the mainstream equipment for level measurement in thermal power plant water tanks, widely used in various operating scenarios such as steam drums, deaerator tanks, and circulating water tanks.

[0003] However, existing radar level gauges still have many inherent defects in their application to water tank measurement in thermal power plants, affecting measurement accuracy and long-term stability. Thermal power plant water tanks typically contain components such as heating coils, steam-water separators, anti-vortex plates, and internal supports. These components can reflect radar waves, generating false echoes. Therefore, some radar level gauges are equipped with conical shields to block lateral reflection interference. However, the conical shield and radar probe are mostly fixed, creating an irreconcilable technical contradiction: at low liquid levels, the fixed conical shield blocks the radar wave propagation path to the bottom of the tank, further expanding the measurement blind zone and making it impossible to accurately capture the bottom liquid level; at high liquid levels, although it can shield reflections from lateral obstacles to some extent, the shielding range remains unchanged, making it difficult to adapt to interference scenarios where the relative positions of obstacles and radar probes change after liquid level changes, resulting in unstable false echo suppression. Simultaneously, the high-temperature steam and water impurities in the power plant tank combine to form scale and oxide layers on the inner wall of the conical shield after long-term operation. This rough scale layer reflects radar waves, generating secondary false echoes, superimposing interference on the real signal and damaging the directional channel function of the conical shield. The existing structure lacks targeted protection and cleaning designs; after scale buildup on the inner wall of the conical shield, it requires shutdown and disassembly for cleaning, making it difficult to meet the continuous and efficient operation and maintenance requirements of power plants. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid level measuring instrument for water tanks in thermal power plants, which solves the problem mentioned in the background art of existing radar liquid level instruments for water tanks in thermal power plants. These instruments are equipped with fixed conical shields because the internal components of the water tank are prone to generating false echoes. However, these fixed conical shields present a contradiction in measuring high and low liquid levels. At the same time, high-temperature steam and water impurities are prone to scale formation on the inner wall of the conical shield, which in turn generates secondary false echo interference signals. Furthermore, the existing structure lacks a targeted protection and cleaning design, and the system needs to be shut down for cleaning after scaling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid level measuring instrument for a thermal power plant water tank, comprising a measurement and processing module, a fixed tube fixed to the bottom end of the measurement and processing module, and a control box sleeved and fixed to the outside of the bottom end of the fixed tube. Several connecting rods are fixedly connected between the measurement and processing module and the control box. A mounting flange is sleeved and fixed to the outside of the control box. Several mounting holes are circumferentially opened at equal angles around the edge of the mounting flange. A conical shield is fixedly connected to the bottom end of the fixed tube. A probe telescopic assembly is provided inside the fixed tube. The probe telescopic assembly includes an inner tube, a mounting base, and a radar probe. The inner tube is slidably installed inside the fixed tube. The mounting base is fixedly installed on the outside of the end of the inner tube away from the measurement and processing module. The radar probe is fixedly installed on the outside of the bottom end of the mounting base. An adaptive cleaning component is provided on the outside of the mounting base.

[0006] Furthermore, a limiting rack is fixedly installed on one side of the inner tube, and an installation cavity is provided inside the control box near the limiting rack. A rotating shaft is rotatably installed inside the installation cavity, and a limiting gear is sleeved and fixed on the outside of the rotating shaft. The limiting gear meshes with the limiting rack.

[0007] Furthermore, a stepper motor is fixed to the outside of one side of the control box. The output end of the stepper motor is coaxially fixed to one end of the rotating shaft. A spring-type wire reel is mounted on the bottom of the measurement and processing module inside the fixed tube via a bracket. A transmission line is wound around the outside of the spring-type wire reel. One end of the transmission line is electrically connected to the measurement and processing module, and the other end of the transmission line is electrically connected to the radar probe.

[0008] Furthermore, a mounting base is fixedly installed on the bottom of the control box, and a humidity intelligent sensor is fixedly installed on one end of the mounting base. An electric heating tube is fixedly wound around the outside of the conical shield, and the electric heating tube is electrically connected to the control box through a conductive wire.

[0009] Furthermore, a display module is installed at the top of the measurement processing module, and a protective cover is fixed to the outside of the display module. Several anti-slip blocks are fixed around the outer side of the protective cover at equal angles. A junction box is fixedly installed on one side of the measurement processing module, and several connectors are installed on the outside of the junction box.

[0010] Furthermore, the adaptive cleaning component includes an annular airbag and a spring tube. The annular airbag is sleeved and fixed to the outside of the mounting base, and the spring tube is disposed on one side of the annular airbag. The outer surface of the annular airbag can closely abut and fit against the inner wall of the conical shield.

[0011] Furthermore, a limiting groove is formed on the outer side of the inner tube near the spring tube, and a limiting block is fixedly installed on the inner wall of the fixed tube near the bottom. One end of the limiting block is slidably engaged inside the limiting groove, and a suction cylinder is fixedly inserted through the inside of the limiting block.

[0012] Furthermore, a piston block is slidably installed inside the suction cylinder, and a connecting rod is fixedly installed on the middle of one side of the piston block. The end of the connecting rod away from the piston block is embedded and fixedly installed on the inner wall of one side of the limiting slide groove.

[0013] Furthermore, a second connector is fixedly attached to the end of the suction cylinder away from the connecting rod, and the end of the second connector away from the suction cylinder is fixedly connected to one end of the spring tube.

[0014] Furthermore, the other end of the spring tube is fixedly connected to a first connector, and the end of the first connector away from the spring tube is fixedly installed inside one side of the annular airbag.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By incorporating the telescopic probe assembly, the water tank level measuring instrument for this thermal power plant effectively overcomes the contradiction between high and low liquid level measurements caused by the fixed conical shield, significantly improving measurement accuracy and stability. At low liquid levels, the radar probe extends beyond the conical shield, completely avoiding radar wave obstruction and eliminating blind spots, ensuring accurate capture of the bottom liquid level signal. At high liquid levels, the radar probe retracts into the conical shield, effectively blocking false echoes generated by internal components, ensuring accurate signal recognition and adapting to different liquid level conditions. Simultaneously, the electric heating element and intelligent humidity sensor monitor the ambient humidity in real time. When the water vapor condensation threshold is reached, heating is automatically activated, raising the surface temperature of the conical shield and radar probe above the dew point, reducing water vapor condensation at the source, lowering the probability of scale formation, and providing preventative protection. This, combined with the telescopic function, provides dual protection for stable radar signals, perfectly suited to the high-temperature and high-humidity operating conditions of thermal power plants.

[0016] 2. Through the adaptive cleaning component, the water tank level measuring instrument for thermal power plants can specifically address the scaling problem on the inner wall of the conical shield and the surface of the radar probe during use. It can complete efficient cleaning without stopping the machine, avoiding monitoring interruptions. The annular airbag can expand and contract with the radar probe to inflate and deflate, closely adhering to the surface to be cleaned, effectively scraping away existing scale and oxide layers. This prevents scale from reflecting radar waves and generating secondary false echoes, while also preventing scale from damaging the directional channel function of the conical shield, ensuring signal transmission stability. This component complements the preventive anti-scaling function of the electric heating tube and the intelligent humidity sensor, both removing existing scale and reducing scale formation, comprehensively ensuring the long-term stable operation of the instrument and accurately adapting to the continuous and efficient operation and maintenance needs of thermal power plants. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the control box and the intelligent humidity sensor of the present invention; Figure 3 This is a schematic diagram of the overall and partial cross-sectional three-dimensional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 6 This is a partial cross-sectional three-dimensional structural diagram of the fixed tube and inner tube of the present invention; Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the limiting groove and limiting block of the present invention; Figure 8 This is a three-dimensional structural diagram of the connecting rod and piston block of the present invention; Figure 9 This is a three-dimensional structural diagram of the limiting block and suction cylinder of the present invention; Figure 10 This is a three-dimensional structural diagram of the annular airbag and the first connector of the present invention; Figure 11 This is a three-dimensional structural diagram of the suction cylinder and the second connector of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Measurement and processing module; 2. Control box; 3. Mounting flange; 4. Mounting hole; 5. Fixing pipe; 6. Connecting rod; 7. Junction box; 8. Conical shield; 9. Electric heating element; 10. Intelligent humidity sensor; 11. Inner tube; 12. Mounting cavity; 13. Rotating shaft; 14. Limiting rack; 15. Limiting gear; 16. Stepper motor; 17. Mounting base; 18. Radar probe; 19. Spring-loaded wire reel; 20. Transmission line; 21. Limiting groove; 22. Limiting block; 23. Suction cylinder; 24. Connecting rod; 25. Piston block; 26. Annular airbag; 27. Bourdon tube; 28. First connector; 29. ​​Second connector; 30. Wiring terminal; 31. Display module; 32. Protective cover; 33. Fixing base; 34. Conductive wire; 35. Anti-slip block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1-6 A liquid level measuring instrument for a water tank in a thermal power plant includes a measurement and processing module 1, a fixed tube 5 fixed to the bottom of the measurement and processing module 1, and a control box 2 sleeved and fixed to the outside of the bottom of the fixed tube 5. Several connecting rods 6 are fixedly connected between the measurement and processing module 1 and the control box 2. A mounting flange 3 is sleeved and fixed to the outside of the control box 2. Several mounting holes 4 are opened at equal angles around the edge of the mounting flange 3. A conical shield 8 is fixedly connected to the bottom of the fixed tube 5. A probe telescopic assembly is provided inside the fixed tube 5. The probe telescopic assembly includes an inner tube 11, a mounting base 17, and a radar probe 18. The inner tube 11 is slidably installed inside the fixed tube 5. The mounting base 17 is fixedly installed on the outside of the end of the inner tube 11 away from the measurement and processing module 1. The radar probe 18 is fixedly installed on the outside of the bottom of the mounting base 17.

[0021] A limiting rack 14 is fixedly installed on one side of the inner tube 11. An installation cavity 12 is provided inside the control box 2 near the limiting rack 14. A rotating shaft 13 is rotatably installed inside the installation cavity 12. A limiting gear 15 is sleeved and fixed on the outside of the rotating shaft 13. The limiting gear 15 is meshed with the limiting rack 14.

[0022] A stepper motor 16 is fixed to one side of the control box 2. The output end of the stepper motor 16 is coaxially fixed to one end of the rotating shaft 13. A spring-type wire reel 19 is installed at the bottom of the measurement processing module 1 inside the fixed tube 5 via a bracket. A transmission line 20 is wound around the outside of the spring-type wire reel 19. One end of the transmission line 20 is electrically connected to the measurement processing module 1, and the other end of the transmission line 20 is electrically connected to the radar probe 18.

[0023] A mounting base 33 is fixedly installed on the bottom of the control box 2. A humidity smart sensor 10 is fixedly installed on one end of the mounting base 33. An electric heating tube 9 is fixedly wound around the outside of the conical shield 8. The electric heating tube 9 is electrically connected to the control box 2 through a conductive wire 34.

[0024] A display module 31 is installed at the top of the measurement processing module 1. A protective cover 32 is installed and fixed on the outside of the display module 31. Several anti-slip blocks 35 are fixed around the outer side of the protective cover 32 at equal angles. A junction box 7 is fixedly installed on one side of the measurement processing module 1. Several wire heads 30 are installed on the outside of the junction box 7.

[0025] In this embodiment, when using the water tank level measuring instrument for this thermal power plant, the equipment is first installed and fixed, and then the measurement state is adaptively adjusted according to the water tank level. During installation, the conical shield 8 is first passed through the flange pipe reserved at the top of the thermal power plant water tank, so that the mounting flange 3 is aligned with the flange surface at the top of the water tank. Bolts are inserted and tightened through the mounting holes 4 on the edge of the mounting flange 3 to achieve a sealed fixation between the measuring instrument and the water tank. The connecting rod 6 can strengthen the connection stability between the measurement processing module 1 and the control box 2 and prevent structural loosening caused by operating vibration. Then, the wiring head 30 outside the junction box 7 is connected to the external power supply and control lines. The existing spring-type wire reel 19 at the bottom of the measurement processing module 1 can automatically store or release the transmission line 20 to ensure that the transmission line 20 does not get tangled or pulled during the subsequent extension and retraction of the radar probe 18, and stably realize the electrical connection and signal transmission between the measurement processing module 1 and the radar probe 18.

[0026] After the equipment is put into use, it automatically switches its working state according to the water tank level. When the water tank is in a low-level condition, the measurement and processing module 1 sends a control signal to start the stepper motor 16. The output of the stepper motor 16 drives the rotating shaft 13 to rotate. The limiting gear 15 on the outside of the rotating shaft 13 rotates synchronously. Through meshing with the limiting rack 14 on one side of the inner tube 11, the inner tube 11 is driven to slide smoothly down the inside of the fixed tube 5, thereby pushing the radar probe 18 at the bottom of the mounting base 17 to extend out of the conical shield 8. This completely avoids the obstruction of the radar wave propagation path by the conical shield 8, eliminates the low-level measurement blind zone, and accurately captures the water tank bottom level signal, solving the problem that traditional fixed structures cannot accurately measure low levels.

[0027] When the water tank is at a high liquid level, the measurement and processing module 1 controls the stepper motor 16 to rotate in the opposite direction. Through the above-mentioned meshing transmission structure, the inner tube 11 is driven to slide upward, so that the radar probe 18 is retracted into the conical shield 8. At this time, the conical shield 8 can effectively block the radar waves reflected by the heating coil, support and other components in the water tank, suppress false echo interference, ensure the accuracy of signal identification under high liquid level, and perfectly resolve the contradiction between high and low liquid level measurement.

[0028] During use, the intelligent humidity sensor 10 on the bottom mounting base 33 of the control box 2 monitors the humidity and dew point temperature of the environment near the conical shield 8 in real time and feeds the monitoring data back to the measurement and processing module 1. When the detected value reaches the critical threshold for water vapor condensation, the measurement and processing module 1 automatically activates the electric heating tube 9 wound around the outside of the conical shield 8 through the conductive wire 34. The electric heating tube 9 heats the conical shield 8 evenly, so that the surface temperature of the conical shield 8 and the radar probe 18 is always higher than the dew point temperature, thereby reducing the condensation of high-temperature steam on the surface from the source and reducing the probability of scale formation. This protective function works in conjunction with the extension and retraction of the radar probe 18 to ensure measurement accuracy at different liquid levels and extend the equipment maintenance cycle through preventative scale prevention, meeting the continuous and efficient operation and maintenance needs of thermal power plants. At the same time, the spring-loaded wire reel 19 can synchronously adjust the length of the transmission line 20 as the inner tube 11 extends and retracts, avoiding wear or breakage of the transmission line 20 and further improving the stability of equipment operation. In addition, after the radar probe 18 extends and retracts, the measurement and processing module 1 will automatically identify the extension and retraction distance of the inner tube 11, automatically subtract and add this distance from the raw data detected by the radar probe 18, complete the data compensation processing, and ensure that the final output liquid level detection result is accurate.

[0029] Example 2: Please refer to Figures 6-11 This embodiment further describes Example 1, wherein an adaptive cleaning component is provided on the outer side of the mounting base 17.

[0030] The adaptive cleaning component includes an annular airbag 26 and a spring tube 27. The annular airbag 26 is sleeved and fixed on the outside of the mounting base 17, and the spring tube 27 is disposed on one side of the annular airbag 26. The outer surface of the annular airbag 26 can closely contact and fit against the inner wall of the conical shield 8.

[0031] A limiting groove 21 is provided on the outer side of the inner tube 11 near the spring tube 27. A limiting block 22 is fixedly installed on the inner wall of the fixed tube 5 near the bottom. One end of the limiting block 22 is slidably engaged inside the limiting groove 21. A suction cylinder 23 is fixedly fixed inside the limiting block 22.

[0032] A piston block 25 is slidably installed inside the suction cylinder 23. A connecting rod 24 is fixedly installed on the middle of one side of the piston block 25. The end of the connecting rod 24 away from the piston block 25 is embedded and fixedly installed on the inner wall of the limiting slide groove 21.

[0033] A second connector 29 is fixedly attached to the end of the suction cylinder 23 away from the connecting rod 24. The end of the second connector 29 away from the suction cylinder 23 is fixedly connected to one end of the spring tube 27.

[0034] The other end of the spring tube 27 is fixedly connected to a first connector 28, and the end of the first connector 28 away from the spring tube 27 is fixedly installed inside one side of the annular airbag 26.

[0035] In this embodiment, an adaptive cleaning component is added to automatically clean the inner wall of the conical shield 8, which is mechanically linked to the probe's extension and retraction.

[0036] When the water tank is at a low liquid level, the measurement and processing module 1 controls the stepper motor 16 to drive the inner tube 11 to slide downwards along the inside of the fixed tube 5. As the radar probe 18 extends out of the conical shield 8, the limiting groove 21 on one side of the inner tube 11 simultaneously slides downwards along the limiting block 22 on the inner wall of the fixed tube 5. The sliding engagement of the limiting block 22 and the limiting groove 21 can accurately guide and limit the entire extension and retraction trajectory of the inner tube 11, effectively preventing radial offset and shaking during the sliding process of the inner tube 11. This not only ensures the stability and positional accuracy of the radar probe 18's extension action, but also reduces frictional wear between the inner tube 11 and the inner wall of the fixed tube 5, extending the overall service life of the components. During this process, as the limiting slide 21 moves downward, it drives the connecting rod 24 to move downward in sync. The connecting rod 24 pushes the piston block 25 to slide in a sealed manner inside the suction cylinder 23, which uniformly compresses the gas in the suction cylinder 23 into the gas passage. The gas is injected into the annular airbag 26 in sequence through the second connector 29, the spring tube 27 and the first connector 28, so that the annular airbag 26 expands uniformly and fits tightly against the inner wall of the conical shield 8. Simultaneously with the downward movement of the inner tube 11, the inner wall of the conical shield 8 is wiped, effectively scraping off the attached thin scale, steam droplets and other impurities, and removing in advance the tiny interference sources that may affect the propagation of radar waves under low liquid level conditions. At this point, the radar probe 18 has fully extended out of the conical shield 8. The expanded annular airbag 26 only contacts the inner wall of the conical shield 8 and will not touch the radar probe 18. This ensures that the cleaning action does not interfere with the capture of the low liquid level measurement signal, completely avoids the shield 8 from blocking the radar wave, eliminates the measurement blind spot, and achieves preventive cleaning under low liquid level conditions. This prevents the long-term accumulation of thin scale into stubborn dirt and reduces the difficulty of subsequent cleaning from the source.

[0037] When the water level in the tank rises to the high level, the measurement and processing module 1 controls the stepper motor 16 to rotate in reverse, driving the inner tube 11 to slide upward along the inside of the fixed tube 5. When the radar probe 18 retracts into the conical shield 8, the limiting groove 21 slides upward synchronously with the inner tube 11. The limiting block 22 continues to play a guiding and limiting role, preventing the inner tube 11 from getting stuck or tilting when moving upward, ensuring that the radar probe 18 retracts smoothly and preventing the radar probe 18 from colliding and being damaged by the inner wall of the conical shield 8. At the same time, the movement of the limiting groove 21 outside the inner tube 11 drives the connecting rod 24 to move upward synchronously. The connecting rod 24 pulls the piston block 25 to slide in the reverse sealing direction inside the suction cylinder 23, creating a negative pressure inside the suction cylinder 23. This creates a uniform suction of air into the annular airbag 26 through the air passage, causing the annular airbag 26 to deflate uniformly under the negative pressure. As the airbag deflates and moves upward synchronously with the inner tube 11, its outer surface maintains continuous and uniform contact with the inner wall of the conical shield 8, effectively scraping away stubborn scale, oxide layers, and other impurities adhering to the inner wall of the conical shield 8. This cleaning action thoroughly removes the root cause of secondary false echoes generated by radar waves reflected by scale, while preventing scale from damaging the directional channel function of the conical shield 8. This ensures a more stable and lasting suppression effect on false echoes from internal components of the water tank under high liquid level conditions, significantly improving the accuracy and reliability of measurement data. In addition, the entire cleaning process relies on the mechanical linkage of the probe's extension and retraction, requiring no additional power source. The cleaning and measurement actions are completed simultaneously without the need for shutdown and disassembly, perfectly meeting the continuous and efficient operation and maintenance needs of thermal power plants.

[0038] The spring tube 27 can flexibly deform with the extension and retraction of the inner tube 11, effectively preventing the gas pipeline from being pulled, bent, or broken, ensuring the smoothness of the charging and discharging operation. At the same time, this cleaning method complements the preventive anti-scaling function of the electric heating tube 9 and the humidity intelligent sensor 10 in Embodiment 1. The former specifically removes existing scale, while the latter reduces scale formation from the source. Cleaning and maintenance can be completed without stopping the machine for disassembly, ensuring the long-term stable operation of the instrument in all aspects and accurately adapting to the continuous and efficient operation and maintenance needs of thermal power plants.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid level measuring instrument for a water tank in a thermal power plant, comprising a measurement and processing module (1), a fixing tube (5) fixed to the bottom end of the measurement and processing module (1), and a control box (2) sleeved and fixed to the outside of the bottom end of the fixing tube (5), characterized in that: The measurement processing module (1) and the control box (2) are fixedly connected by several connecting rods (6). The control box (2) is fitted with a mounting flange (3). The mounting flange (3) has several mounting holes (4) that are equidistantly circumferentially opened at the edge of the flange. The bottom end of the fixed tube (5) is fixedly connected to a conical shield (8). The fixed tube (5) is equipped with a probe telescopic assembly. The probe telescopic assembly includes an inner tube (11), a mounting base (17), and a radar probe (18). The inner tube (11) is slidably installed inside the fixed tube (5). The mounting base (17) is fixedly installed outside the end of the inner tube (11) away from the measurement and processing module (1). The radar probe (18) is fixedly installed outside the bottom end of the mounting base (17). An adaptive cleaning component is provided on the outside of the mounting base (17).

2. The liquid level measuring instrument for a thermal power plant water tank according to claim 1, characterized in that: A limiting rack (14) is fixedly installed on one side of the inner tube (11). An installation cavity (12) is provided inside the control box (2) near the limiting rack (14). A rotating shaft (13) is rotatably installed inside the installation cavity (12). A limiting gear (15) is sleeved and fixed on the outside of the rotating shaft (13). The limiting gear (15) meshes with the limiting rack (14).

3. The liquid level measuring instrument for a thermal power plant water tank according to claim 2, characterized in that: A stepper motor (16) is fixed to one side of the control box (2). The output end of the stepper motor (16) is coaxially fixed to one end of the rotating shaft (13). A spring-type wire reel (19) is installed at the bottom of the measurement processing module (1) inside the fixed tube (5) through a bracket. A transmission line (20) is wound around the outside of the spring-type wire reel (19). One end of the transmission line (20) is electrically connected to the measurement processing module (1), and the other end of the transmission line (20) is electrically connected to the radar probe (18).

4. The liquid level measuring instrument for a thermal power plant water tank according to claim 1, characterized in that: A mounting base (33) is fixedly installed on the bottom of the control box (2). A humidity smart sensor (10) is fixedly installed on one end of the mounting base (33). An electric heating tube (9) is fixedly wound around the outside of the conical shield (8). The electric heating tube (9) is electrically connected to the control box (2) through a conductive wire (34).

5. The liquid level measuring instrument for a thermal power plant water tank according to claim 1, characterized in that: The top of the measurement processing module (1) is equipped with a display module (31). The display module (31) is covered and fixed with a protective cover (32). Several anti-slip blocks (35) are fixed around the outer side of the protective cover (32) at equal angles. A junction box (7) is fixedly installed on one side of the measurement processing module (1). Several wire heads (30) are installed on the outside of the junction box (7).

6. The liquid level measuring instrument for a thermal power plant water tank according to claim 1, characterized in that: The adaptive cleaning component includes an annular airbag (26) and a spring tube (27). The annular airbag (26) is sleeved and fixed on the outside of the mounting base (17). The spring tube (27) is disposed on one side of the annular airbag (26). The outer surface of the annular airbag (26) can be in close contact with the inner wall of the conical shield (8).

7. A liquid level measuring instrument for a thermal power plant water tank according to claim 6, characterized in that: A limiting groove (21) is provided on the outer side of the inner tube (11) near the spring tube (27). A limiting block (22) is fixedly installed on the inner wall of the fixed tube (5) near the bottom. One end of the limiting block (22) is slidably engaged inside the limiting groove (21). A suction cylinder (23) is fixedly inserted inside the limiting block (22).

8. The liquid level measuring instrument for a thermal power plant water tank according to claim 7, characterized in that: The suction cylinder (23) has a piston block (25) slidably installed inside. A connecting rod (24) is fixedly installed on the middle of one side of the piston block (25). The end of the connecting rod (24) away from the piston block (25) is embedded and fixedly installed on the inner wall of the limiting groove (21).

9. A liquid level measuring instrument for a thermal power plant water tank according to claim 8, characterized in that: The suction cylinder (23) is fixedly connected to a second connector (29) at one end away from the connecting rod (24). The end of the second connector (29) away from the suction cylinder (23) is fixedly connected to one end of the spring tube (27).

10. A liquid level measuring instrument for a thermal power plant water tank according to claim 9, characterized in that: The other end of the spring tube (27) is fixedly connected to a first connector (28), and the end of the first connector (28) away from the spring tube (27) is fixedly installed inside one side of the annular airbag (26).

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