A liquid level measuring device

Abstract

The application discloses a liquid level measuring device, which comprises a reaction kettle, a first measuring assembly, a second measuring assembly and a control assembly. The first measuring assembly comprises a temperature transmitter and a protection tube. The temperature transmitter is arranged at the top of the reaction kettle. The protection tube is connected with the temperature transmitter. The end of the protection tube, which is far away from the temperature transmitter, extends to the reaction kettle along the height direction of the reaction kettle. A plurality of temperature sensing elements are arranged in the protection tube. The plurality of temperature sensing elements are connected with the temperature transmitter. The second measuring assembly is arranged at the top of the reaction kettle. The testing end of the second measuring assembly faces the inside of the reaction kettle, so that the liquid in the reaction kettle can be measured. The control assembly is connected with the temperature transmitter and the second measuring assembly respectively. The liquid level measuring device can realize the cooperation of contact type measurement and non-contact type measurement, realize the self-diagnosis and self-correction of liquid level measurement under complex conditions such as dielectric constant fluctuation, unstable temperature field and liquid surface disturbance, and improve the measurement precision.

Description

Technical Field

[0001] This application relates to the field of liquid level measurement technology, and in particular to a liquid level measuring device. Background Technology

[0002] In chemical, pharmaceutical and other industrial processes, accurate and reliable measurement of the liquid level inside the reactor is crucial for safe production and process control.

[0003] Existing liquid level measurement technologies often employ either radar level gauges or temperature sensors for measurement. However, these single measurement methods are susceptible to fluctuations in operating conditions, changes in medium properties, or interference from internal structures, resulting in insufficient reliability. Specifically, radar level gauges rely on the reflection characteristics of electromagnetic waves on the surface of the medium. When the dielectric constant of the medium in the reactor fluctuates due to changes in composition, or when the liquid level fluctuates violently due to stirring, gas production, etc., the propagation path and reflected signal intensity of the electromagnetic waves change, leading to deviations in the measurement data. Temperature-based liquid level measurement methods determine the liquid level by detecting the temperature gradient at different heights within the reactor. When the reaction system is in a isothermal reaction stage, resulting in an insignificant temperature gradient, or when rapid temperature changes occur due to feeding, heating, or other operations, the stability of the temperature field is disrupted, rendering the basis for liquid level judgment ineffective and ultimately leading to decreased measurement accuracy. Utility Model Content

[0004] This application aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the purpose of this application is to provide a liquid level measuring device capable of coordinating contact and non-contact measurements, enabling self-diagnosis and self-calibration of liquid level measurement under complex conditions such as dielectric constant fluctuations, unstable temperature fields, and liquid surface disturbances, thereby improving measurement accuracy.

[0005] A liquid level measuring device according to an embodiment of this application includes: Reactor; The first measuring component includes a temperature transmitter and a protective tube. The temperature transmitter is disposed at the top of the reactor. The protective tube is connected to the temperature transmitter. One end of the protective tube away from the temperature transmitter extends into the reactor along the height direction. Multiple temperature sensing elements are disposed inside the protective tube, and all of the multiple temperature sensing elements are connected to the temperature transmitter. A second measuring component is disposed at the top of the reactor, with its test end facing the inside of the reactor to measure the liquid inside the reactor. A control component is connected to both the temperature transmitter and the second measurement component.

[0006] The liquid level measuring device according to the embodiments of this application has at least the following beneficial effects: The end of the protective tube away from the temperature transmitter extends into the reactor along the height direction of the reactor. Multiple temperature-sensing elements arranged along the height direction of the reactor inside the protective tube collect temperature data. The first measuring component, through contact measurement with the liquid in the reactor, can provide a basis for liquid level judgment when the radar measurement of the second measuring component is interfered with. The second measuring component transmits radar signals in a non-contact manner, enabling it to capture the liquid level position in the reactor when the reaction system is in a constant temperature state or undergoes drastic temperature changes such as feeding or heating, thus compensating for the deficiency of the temperature field failure of the first measuring component. Furthermore, the control component dynamically compares the difference in liquid level height measured by the first and second measuring components in real time. When the difference exceeds a preset threshold, it can automatically identify the faulty unit, switch to the normal measurement signal as the main output value, and trigger an alarm. This application uses the first and second measuring components to measure the liquid level in the reactor, achieving synergy between contact and non-contact measurement. This enables self-diagnosis and self-correction of liquid level measurement under complex conditions such as dielectric constant fluctuations, unstable temperature fields, and liquid surface disturbances, thereby improving measurement accuracy.

[0007] According to some embodiments of this application, each of the temperature sensing elements has protrusions on both opposite sides, and the protective tube has multiple grooves, with the protrusions engaging with the corresponding grooves.

[0008] According to some embodiments of this application, the protective tube is provided with an insulating filler, which covers the temperature sensing element and is used to block the heat conduction path between adjacent temperature sensing elements.

[0009] According to some embodiments of this application, a plurality of support sleeves are provided on the outer side of the protective tube, the plurality of support sleeves are spaced apart, and each support sleeve is connected to the inner wall of the reactor.

[0010] According to some embodiments of this application, the support sleeve includes a head and a tail connected to the head, the head being sleeved on the outside of the protective tube, and the tail being connected to the inner wall of the reactor.

[0011] According to some embodiments of this application, the inner wall of the protective tube is provided with an anti-adhesion layer, which is used to prevent the adhesion of high-viscosity media.

[0012] According to some embodiments of this application, a plurality of temperature sensing elements are arranged at intervals, and the spacing between two adjacent temperature sensing elements is equal.

[0013] According to some embodiments of this application, the spacing between two adjacent temperature sensing elements is set to 1 / 3 to 1 / 2 of the height of the temperature sensing element.

[0014] According to some embodiments of this application, the temperature transmitter is connected to a plurality of the temperature sensing elements via a data line.

[0015] According to some embodiments of this application, the reactor is provided with a stirring blade and an inner oil pipe. The protective pipe and the second measuring component are respectively arranged on opposite sides of the central axis of the reactor. The protective pipe and the second measuring component are both located between the stirring blade and the inner oil pipe.

[0016] According to some embodiments of this application, the second measuring component includes a radar level gauge, a waveguide, and a connector. The radar level gauge is connected to the control component, the radar level gauge is connected to the waveguide through the connector, and the waveguide is connected to the reactor.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the liquid level measuring device according to an embodiment of this application; Figure 2 for Figure 1 Enlarged view of section A.

[0019] Attached reference numerals: 100, reaction vessel; 200, First measuring component; 210, Temperature transmitter; 220, Protective tube; 230, Temperature sensing element; 231, Protrusion; 240, First connector; 250, Data cable; 260, Insulating filler; 270, Support sleeve; 271, Head; 272, Tail; 300. Second measuring component; 310. Radar level gauge; 320. Waveguide; 330. Second connector; 400. Control component; 410. Controller; 420. Host computer. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Reference Figure 1 This application provides a liquid level measuring device, including a reaction vessel 100, a first measuring component 200, a second measuring component 300, and a control component 400. The first measuring component 200 includes a temperature transmitter 210 and a protective tube 220. The temperature transmitter 210 is disposed on the top of the reaction vessel 100, and the protective tube 220 is connected to the temperature transmitter 210. One end of the protective tube 220 away from the temperature transmitter 210 extends along the height direction of the reaction vessel 100 into the reaction vessel 100. A plurality of temperature sensing elements 230 are disposed inside the protective tube 220, and all of the plurality of temperature sensing elements 230 are connected to the temperature transmitter 210. The second measuring component 300 is disposed on the top of the reaction vessel 100, and the test end of the second measuring component 300 faces the inside of the reaction vessel 100 to measure the liquid inside the reaction vessel 100. The control component 400 is connected to the temperature transmitter 210 and the second measuring component 300 respectively.

[0026] Specifically, the end of the protective tube 220 away from the temperature transmitter 210 extends along the height direction of the reactor 100 into the reactor 100. Multiple temperature-sensing elements 230 arranged along the height direction of the reactor 100 within the protective tube 220 collect temperature data. The first measuring component 200, through contact measurement with the liquid inside the reactor 100, can provide a basis for liquid level judgment when the radar measurement of the second measuring component 300 is interfered with. The second measuring component 300 transmits radar signals in a non-contact manner, enabling it to capture the liquid level position inside the reactor 100 when the reaction system is in a constant temperature state or undergoes drastic temperature changes such as feeding or heating, thus compensating for the deficiencies in the temperature field of the first measuring component 200. Furthermore, the control component 400 dynamically compares the difference in liquid level height measured by the first measuring component 200 and the second measuring component 300 in real time. When the difference exceeds a preset threshold, it can automatically identify the faulty unit, switch to the normal measurement signal as the main output value, and trigger an alarm. This application uses the first measuring component 200 and the second measuring component 300 to measure the liquid level of the reactor 100, realizing the synergy of contact measurement and non-contact measurement, and achieving self-diagnosis and self-correction of liquid level measurement under complex conditions such as dielectric constant fluctuation, unstable temperature field, and liquid surface disturbance, thereby improving measurement accuracy.

[0027] Reference Figure 1 In some embodiments, a first connector 240 is provided on the top of the reactor 100. The top of the first connector 240 is connected to the temperature transmitter 210. The first connector 240 enables the temperature transmitter 210 to be mounted on the top of the reactor 100, providing structural support for stable temperature data acquisition and avoiding measurement signal interruption or deviation due to unstable connection. Furthermore, the first connector 240 can be a flange. Flange connections are easy to install and remove. When the temperature transmitter 210 needs maintenance, calibration, or replacement, there is no need to modify the main structure of the reactor 100; the relevant operations can be completed simply by disassembling the flange connection, reducing maintenance difficulty and downtime costs. Of course, in actual design, the structure of the first connector 240 can be designed according to actual needs.

[0028] Reference Figure 1 , Figure 2 In some embodiments, the temperature transmitter 210 is connected to multiple temperature sensing elements 230 via a data line 250, so that the temperature signal collected by each temperature sensing element 230 can be transmitted to the temperature transmitter 210 via the data line 250, avoiding signal confusion or attenuation during transmission.

[0029] In some embodiments, the data line 250 is covered with a nickel-based alloy shielding layer. The nickel-based alloy has good electromagnetic shielding performance, which can block electromagnetic radiation generated by motors, stirring equipment, etc. in the environment around the reactor 100, as well as stray electromagnetic fields generated by the operation of electrical components inside the reactor. This prevents these interference signals from intruding into the transmission core wire inside the data line 250, prevents the temperature signal from being superimposed and interfered with, and ensures that the raw temperature data collected by the temperature sensing element 230 can be accurately transmitted to the temperature transmitter 210.

[0030] In some embodiments, the temperature sensing element 230 is set as an S-type platinum-rhodium 10-platinum thermocouple, or the temperature sensing element 230 is set as a K-type thermocouple, PT100 thermocouple, or other materials as required. It has hardware scalability, breaks through the limitation of fixed measurement range, and enables the liquid level measuring device to adapt to the measurement needs of different media.

[0031] Reference Figure 1 In some embodiments, the protective tube 220 extends to near the bottom of the reactor 100. In the first measuring assembly 200, multiple temperature sensing elements 230 arranged along the height direction of the reactor 100 extend with the protective tube 220 to the lower region of the reactor body, so that the temperature sensing coverage range extends from the top of the reactor 100 to the space near the bottom. Regardless of whether the liquid level is high, medium, or low, there is a corresponding temperature sensing element 230 that can capture the temperature difference between the upper and lower parts of the liquid surface, ensuring the measurement of the full range of liquid level in the reactor 100.

[0032] In some embodiments, the protective tube 220 is made of Hastelloy C276, which has excellent corrosion resistance and can withstand the erosion of common strong acids, strong alkalis, salt solutions, and various organic media commonly found in the reactor 100. This prevents the tube wall of the protective tube 220 from perforating or breaking due to corrosion, and prevents the temperature sensing element 230 from being damaged by direct contact with corrosive media. Of course, in actual design, the material of the protective tube 220 can be designed according to actual needs.

[0033] Reference Figure 1 , Figure 2In some embodiments, each temperature sensing element 230 has a protrusion 231 on both opposite sides, and the protective tube 220 has multiple grooves, with the protrusion 231 engaging with the corresponding groove. Through the engagement of the protrusion 231 and the groove, the temperature sensing element 230 can be positioned at a preset position along the height direction within the protective tube 220. This prevents displacement of the temperature sensing element 230 due to the installation of the protective tube 220, vibration of the reactor 100, or liquid flow, ensuring that the multiple temperature sensing elements 230 are always arranged in an orderly manner along the height direction of the reactor 100. This avoids temperature acquisition deviations caused by positional shifts of the temperature sensing elements 230, making the temperature data output by the first measuring component 200 more accurately reflect the liquid level boundary, further improving the accuracy of contact measurement.

[0034] Reference Figure 1 , Figure 2 In some embodiments, an insulating filler 260 is provided inside the protective tube 220. The insulating filler 260 covers the temperature sensing element 230. The insulating filler 260 has good thermal insulation properties. The covering of the temperature sensing element 230 and the filling of the gaps between the temperature sensing elements 230 by the insulating filler 260 can block the heat conduction path between adjacent temperature sensing elements 230, preventing the temperature sensing element 230 in the high-temperature area from transferring heat to the temperature sensing element 230 in the low-temperature area, thereby reducing the temperature deviation caused by heat conduction and helping to provide real-time and accurate temperature measurement data. In addition, the insulating filler 260 can cover the temperature sensing element 230. When the reactor 100 is subjected to severe vibration during operation, the insulating filler 260 can absorb the vibration energy through its own deformation, reducing the collision and impact between the temperature sensing element 230 and the inner wall of the protective tube 220.

[0035] In some embodiments, the insulating filler 260 is made of calcium silicate powder with high temperature resistance (≤1050℃) and a thermal conductivity of 0.045~0.07W / (m·K), suitable for the high-temperature operating conditions of the reactor 100 and meeting the insulation requirements. The calcium silicate powder can coat the temperature sensing element 230, blocking the heat conduction path between two adjacent temperature sensing elements 230, preventing heat transfer from the high-temperature region to the low-temperature region, thereby reducing temperature deviation caused by heat conduction. Simultaneously, the calcium silicate powder can withstand temperatures ≤1050℃, making it suitable for the high-temperature reaction environment of the reactor 100 and reducing problems such as melting and degradation due to high temperatures. Furthermore, the insulating filler 260 has a filling density of 600~800 kg / m³, and this high-density filling further enhances the insulation effect, preventing heat penetration due to insufficient filling, reducing heat transfer between the temperature sensing elements 230, and avoiding misjudgments. Of course, in actual design, the material and filling density of the insulating filler 260 can be designed according to actual needs.

[0036] Reference Figure 1 , Figure 2 In some embodiments, a plurality of support sleeves 270 are provided on the outer side of the protective tube 220. These support sleeves 270 are spaced apart, and each support sleeve 270 is connected to the inner wall of the reactor 100. The support sleeves 270 can confine the protective tube 220 to a preset position along the height direction of the reactor 100, enabling the protective tube 220 to resist fluid impacts caused by stirring during reactor 100 operation, solid or liquid impacts during material feeding, and vibrations caused by equipment operation. This prevents the protective tube 220 from bending, tilting, or swinging significantly, ensuring the overall structural stability of the protective tube 220. Furthermore, the spaced arrangement of the multiple support sleeves 270 can distribute the force on the protective tube 220 through multi-point support, reducing the load borne by a single support point and lowering the risk of damage to the protective tube 220 caused by localized stress concentration.

[0037] In some embodiments, multiple support sleeves 270 are spaced apart and arranged in two-thirds of the section from bottom to top of the protective tube 220, so that the protective tube 220 can resist the fluid disturbance force generated by stirring during the operation of the reactor 100, the impact force during feeding and equipment vibration, and prevent the lower key section of the protective tube 220 from bending or tilting, thus ensuring the overall structural stability of the protective tube 220.

[0038] Reference Figure 1 , Figure 2 In some embodiments, the support sleeve 270 includes a head 271 and a tail 272 connected to the head 271. The head 271 is sleeved on the outside of the protective tube 220, and the tail 272 is connected to the inner wall of the reactor 100. The head 271, sleeved on the outside of the protective tube 220, can form a circumferential fit with the protective tube 220, thereby radially limiting the protective tube 220 and restraining its horizontal swaying or displacement. This prevents displacement of the protective tube 220 due to fluid impact generated by stirring in the reactor 100 or the impact force of material feeding, ensuring that the protective tube 220 extends vertically into the reactor 100.

[0039] In some embodiments, the material of the support sleeve 270 is set to Hastelloy C276. Of course, in actual design, the material of the support sleeve 270 can be designed according to the design requirements.

[0040] In some embodiments, the inner wall of the protective tube 220 is provided with an anti-adhesion layer to prevent the adhesion of high-viscosity media. Specifically, the anti-adhesion layer is made of polytetrafluoroethylene (PTFE). PTFE can prevent high-viscosity media from adhering to the inner wall of the protective tube 220, avoiding the formation of a heat-insulating layer due to media accumulation that could affect the temperature sensing element 230's capture of temperature gradients, thus ensuring the accuracy of contact measurement data. Furthermore, the PTFE coating thickness is 50 μm, achieving the anti-adhesion effect while preventing radar signal attenuation. Of course, in actual design, the material and thickness of the anti-adhesion layer can be designed according to actual needs.

[0041] Reference Figure 1 , Figure 2 In some embodiments, multiple temperature sensing elements 230 are spaced apart, and the spacing between two adjacent temperature sensing elements 230 is equal, so that the temperature sensing elements 230 form a uniformly distributed array of temperature monitoring points along the height direction of the protective tube 220, avoiding unclear identification of local temperature gradients due to uneven density of monitoring points.

[0042] In some embodiments, the spacing between two adjacent temperature sensing elements 230 is set to 1 / 3 to 1 / 2 of the height of the temperature sensing element 230. This avoids excessively small installation spacing between the temperature sensing elements 230, which would result in a cramped internal space, hindering the arrangement of the data line 250 and causing low filling density of the insulating filler 260, thus affecting the measurement efficiency of the temperature sensing element 230. Specifically, the spacing between two adjacent temperature sensing elements 230 can be set to any value within the range of 1 / 3, 5 / 12, 1 / 2 of the height of the temperature sensing element 230. In actual design, the spacing between two adjacent temperature sensing elements 230 can be designed to be the height of the temperature sensing element 230 according to actual needs.

[0043] In some embodiments, during assembly, the temperature sensing elements 230 are installed starting from the bottom of the protective tube 220, positioning the first temperature sensing element 230 at a preset lowest monitoring point. As subsequent temperature sensing elements 230 are installed sequentially along the height of the protective tube 220, the bottom-mounted element serves as a reference, improving the accuracy of the installation position and ensuring a uniform distribution of temperature monitoring points along the height of the protective tube 220. Furthermore, after each temperature sensing element 230 is installed, insulating filler 260 is added to form initial support, preventing displacement or tilting of the installed temperature sensing elements 230 during subsequent installation operations.

[0044] In some embodiments, the reactor 100 is equipped with a stirring blade and an inner oil pipe. The protective pipe 220 and the second measuring component 300 are respectively located on opposite sides of the central axis of the reactor 100. The protective pipe 220 and the second measuring component 300 are both located between the stirring blade and the inner oil pipe. This avoids the protective pipe 220 from being too close to the stirring blade and experiencing excessive fluid impact stress, which could cause deformation. It also reduces local heat transfer due to proximity to the inner oil pipe, avoids temperature measurement deviation caused by thermal interference, and prevents the electromagnetic echo of the radar level gauge 310 from being interfered with by the stirring blade and the inner oil pipe, thereby improving the reliability of non-contact measurement.

[0045] Reference Figure 1 In some embodiments, the second measuring component 300 includes a radar level gauge 310, a waveguide 320, and a second connector 330. The radar level gauge 310 is connected to the control component 400, and the radar level gauge 310 is connected to the waveguide 320 via the second connector 330. The waveguide 320 is connected to the reactor 100. The radar level gauge 310 transmits high-frequency linear frequency modulated microwaves into the reactor 100 via an antenna. The control component 400 receives the reflected echo from the liquid surface inside the reactor 100, processes the signal to generate a difference frequency signal, and calculates the original liquid level height. The control component 400 dynamically loads and controls the real-time calculated dielectric constant compensation parameters of the medium. The dielectric constant compensation parameters are generated by the axial average temperature of multiple temperature sensing elements 230 inside the protective tube 220 and the corresponding characteristic formula of the medium, so that the output liquid level height of the radar level gauge 310 is always calibrated by the temperature system, solving the measurement deviation caused by dielectric constant drift under high-temperature conditions.

[0046] It should be noted that the dielectric constant compensation parameter of the medium is generated by the axial average temperature of multiple temperature sensing elements 230 in the protection tube 220 and the characteristic formula of the corresponding medium, so that the output liquid level height of the radar level gauge 310 is always calibrated by the temperature system. This is an existing technology, and this application has not made any improvements to this part, so its principle and process will not be described in detail.

[0047] In some embodiments, the radar level gauge 310 is configured as a high-frequency frequency-modulated continuous wave radar level gauge 310. Of course, in actual design, the type of radar level gauge 310 can be designed according to actual needs.

[0048] In some embodiments, the second connector 330 is configured as a flange. Of course, in actual design, the structure of the second connector 330 can be designed according to actual needs.

[0049] In some embodiments, the control component 400 acquires the temperature signal from the temperature sensing element 230 in real time, dynamically calculates the dielectric constant compensation parameter using the axial average temperature, and calibrates the radar measurement value. When the radar echo intensity suddenly changes by more than 40 dB, the temperature gradient liquid level is automatically switched to the main output value. Simultaneously, the status of each temperature sensing element 230 is continuously monitored. When the temperature difference between adjacent temperature sensing elements 230 in the immersion zone of the reactor 100 exceeds 5°C, or the temperature difference in the non-immersion zone exceeds 5°C to 20°C, the control component 400 immediately triggers an audible and visual alarm to promptly indicate an abnormal temperature field within the reactor 100 or a malfunction of the temperature sensing element 230. Of course, in actual design, the temperature difference threshold can be determined based on the preset process temperature range of the reactor.

[0050] It should be noted that the submerged zone refers to the area inside the reactor 100 that is submerged in liquid, while the non-submerged zone refers to the area inside the reactor 100 that is not submerged in liquid.

[0051] In some embodiments, the control component 400 includes a controller 410 and a host computer 420. The controller 410 is connected to the temperature transmitter 210 via a data transmission line, and the controller 410 is electrically connected to the display screen of the host computer 420 via the data transmission line. The controller 410 has a preset liquid level mapping algorithm. When the temperature difference between two adjacent temperature sensing elements 230 exceeds 2℃~25℃, the controller 410 automatically calculates the vertical distance from the abnormal temperature point to the top of the reactor 100 and generates liquid level coordinates, which are simultaneously displayed on the display screen of the host computer 420 in the form of flashing icons superimposed with digital elevation.

[0052] The working principle of the liquid level measuring device in this application is as follows: the temperature sensing element 230 detects the temperature in real time, which is converted into a digital signal by the temperature transmitter 210 and input to the controller 410. The controller 410 dynamically compares the temperature difference between adjacent temperature sensing elements 230 through a liquid level mapping algorithm. When the temperature difference exceeds 2℃~25℃, it locks the temperature change point to generate liquid level coordinates and calculates the axial average temperature. Based on the dielectric constant characteristic formula of the corresponding medium, it outputs real-time dielectric constant compensation parameters to the radar liquid level gauge 310 to calibrate the measured value. Furthermore, it dynamically weights and fuses the test data from the first measuring component 200 and the second measuring component 300. The system performs real-time dual-level mutual calibration diagnosis. When the difference between the liquid levels of the first measuring component 200 and the second measuring component 300 exceeds a preset threshold (e.g., 0.15m), it determines that the liquid level is abnormal and initiates fault tracing. When the radar echo intensity suddenly changes by more than 40dB or distortion occurs, it marks the radar unit as faulty. When the temperature difference between adjacent temperature sensing elements 230 in the immersion zone exceeds 5℃ or the temperature in the non-immersion zone exceeds 5℃~20℃, it marks the temperature unit as faulty and then switches the normal unit signal as the main output value. When any unit fails, the backup system is intelligently activated and an alarm is triggered, achieving high-precision anti-interference continuous monitoring under all operating conditions.

[0053] It should be noted that the controller 410 uses a liquid level mapping algorithm to dynamically compare the temperature difference between adjacent temperature sensing elements 230 and perform real-time dual liquid level mutual calibration diagnosis, which are existing technologies. This application has not made any improvements to this part, so its principle and process will not be described in detail.

[0054] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A liquid level measuring device, characterized in that, include: Reactor; The first measuring component includes a temperature transmitter and a protective tube. The temperature transmitter is disposed at the top of the reactor. The protective tube is connected to the temperature transmitter. One end of the protective tube away from the temperature transmitter extends into the reactor along the height direction. Multiple temperature sensing elements are disposed inside the protective tube, and all of the multiple temperature sensing elements are connected to the temperature transmitter. A second measuring component is disposed at the top of the reactor, with its test end facing the inside of the reactor to measure the liquid inside the reactor. A control component is connected to both the temperature transmitter and the second measurement component.

2. The liquid level measuring device according to claim 1, characterized in that, Each of the temperature sensing elements has a protrusion on each of its opposite sides, and the protective tube has multiple grooves, with the protrusion engaging with the corresponding groove.

3. The liquid level measuring device according to claim 1, characterized in that, The protective tube is filled with an insulating filler that covers the temperature sensing element and is used to block the heat conduction path between adjacent temperature sensing elements.

4. The liquid level measuring device according to claim 1, characterized in that, Multiple support sleeves are provided on the outside of the protective tube, and the multiple support sleeves are spaced apart. Each support sleeve is connected to the inner wall of the reactor.

5. The liquid level measuring device according to claim 4, characterized in that, The support sleeve includes a head and a tail connected to the head. The head is sleeved on the outside of the protective tube, and the tail is connected to the inner wall of the reactor.

6. The liquid level measuring device according to claim 1, characterized in that, The inner wall of the protective tube is provided with an anti-adhesion layer, which is used to prevent the adhesion of high-viscosity media.

7. The liquid level measuring device according to claim 1, characterized in that, Multiple temperature sensing elements are arranged at intervals, and the distance between any two adjacent temperature sensing elements is equal.

8. The liquid level measuring device according to claim 1, characterized in that, The temperature transmitter is connected to multiple temperature sensing elements via a data cable.

9. The liquid level measuring device according to claim 1, characterized in that, The reactor is equipped with a stirring blade and an inner oil pipe. The protective pipe and the second measuring component are respectively located on opposite sides of the central axis of the reactor. The protective pipe and the second measuring component are both located between the stirring blade and the inner oil pipe.

10. The liquid level measuring device according to claim 1, characterized in that, The second measuring component includes a radar level gauge, a waveguide, and a connector. The radar level gauge is connected to the control component, and the radar level gauge is connected to the waveguide through the connector. The waveguide is connected to the reactor.

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