Temperature and liquid level integrated liquid level meter and measuring method

Abstract

The invention relates to the technical field of liquid level meters, in particular to a temperature and liquid level integrated liquid level meter and a measuring method.The temperature and liquid level integrated liquid level meter mainly comprises an electronic bin, a temperature sensor and a protection mechanism, the electronic bin is in signal connection with the temperature sensor through a lead, and the protection mechanism is arranged below the electronic bin and comprises a first round frame and a removing mechanism; the clearing mechanism is arranged below the first round frame and comprises an arc-shaped brush located below the first round frame. A pull rod is pulled to drive a movable plate to move upwards, the movable plate drives a T-shaped block to move upwards and move horizontally, the T-shaped block drives an adjusting plate and a movable frame to rotate and be opened, meanwhile, the T-shaped block drives an arc-shaped plate to move through a movable column, the arc-shaped plate drives an arc-shaped brush to make contact with the outer wall of an outer pipe, a push rod is pushed, and a supporting plate, a supporting rod and the arc-shaped brush are driven to rotate; the arc-shaped brush is used for removing impurities on the outer wall of the outer pipe, and the impurities are not easy to accumulate and gather on the outer wall of the outer pipe to cause blocking, so that the measurement precision and reliability are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level gauges, and in particular to a temperature-liquid-level integrated liquid level gauge and a measuring method. Background Art

[0002] In recent years, many new liquid level detection methods have emerged, and various oil level measuring instruments have developed rapidly. At present, there are three main development directions for oil level measuring instruments: non-contact measurement, intelligent and miniaturized liquid level instruments, and integration. With the development of science and technology, and the transplantation of the latest achievements in other related fields to oil level measurement, oil level measuring instruments have been more widely used in some special occasions (such as high temperature, high pressure, high vacuum, etc.), and the measurement accuracy has also been further improved.

[0003] However, in practical applications, different types of liquids often contain various impurities, including but not limited to suspended particles, sediments, grease, microorganisms, etc. When these impurities exist in the liquid, they can easily accumulate at the lower end of the level meter, especially at the sensing probe or measurement channel of the level meter. Over time, this accumulation will gradually intensify and may even block the detection of the liquid level, greatly affecting the measurement accuracy and reliability.

[0004] Therefore, a temperature-liquid-level integrated liquid level meter and a measurement method are proposed. Summary of the invention

[0005] The object of the present invention is to provide a temperature-liquid-level integrated liquid level meter and a measurement method to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A temperature-liquid-level integrated level meter, comprising: an electronic compartment and a temperature sensor, wherein the electronic compartment is connected to the temperature sensor signal through a lead wire; A protective mechanism is provided below the electronic compartment, the protective mechanism comprising a round frame 1, a protective plate is fixedly mounted on the bottom surface of the round frame 1, and the protective mechanism is used to protect the liquid level meter; A cleaning mechanism is arranged below the circular frame 1, and the cleaning mechanism comprises an arc-shaped brush located below the circular frame 1, an arc-shaped plate is arranged on one side of the arc-shaped brush, and a movable plate is arranged on one side of the arc-shaped plate. The cleaning mechanism is used to clean impurities on the surface of the liquid level meter.

[0007] Preferably, an outer tube and a glass fiber tube are fixedly installed on the bottom surface of the electronic warehouse, the glass fiber tube and the outer tube are coaxially installed, and the glass fiber tube is located inside the outer tube, an inner electrode is installed inside the glass fiber tube, the glass fiber tube is covered with a conductive layer, the outside of the conductive layer is covered with an insulating skin, and the outer surface of the temperature sensor and the outer surface of the lead are covered with a conductive metal film.

[0008] Preferably, a fixing plate is fixedly installed on the side of the electronic warehouse, the bottom surface of the fixing plate is fixedly connected to the top surface of the circular frame by bolts, and the number of the protective plates is multiple.

[0009] Preferably, a second circular frame is fixedly mounted on the bottom surface of the protective plate, and two movable frames are arranged inside the second circular frame.

[0010] Preferably, two through grooves are formed through the top surfaces of the two circular frames, and adjustment plates are rotatably installed on the inner walls of the two through grooves. The side surfaces of the two adjustment plates are fixedly connected to the side surfaces of the two movable frames, and T-shaped blocks are hinged on the side surfaces of one end of the two adjustment plates. Two movable plates are provided.

[0011] Preferably, the bottom surfaces of the two movable plates are respectively provided with T-shaped grooves, the inner walls of the two T-shaped grooves are respectively slidably connected to the sides of the two T-shaped blocks, a plurality of fixed boxes are fixedly installed on the second top surfaces of the circular frame, and the outer walls of the plurality of fixed boxes are respectively provided with through openings.

[0012] Preferably, semicircular plates are slidably installed on the inner walls of the multiple fixed boxes, connecting blocks are fixedly installed on the outer walls of the multiple semicircular plates, the other side surfaces of the multiple connecting blocks are fixedly connected to the side surfaces of the two movable plates, the side surfaces of the multiple connecting blocks are slidably connected to the inner walls of the multiple through openings, the top surfaces of the multiple semicircular plates are elastically connected to the upper inner walls of the multiple fixed boxes through elastic parts, the top surfaces of the two movable plates are fixedly installed with pull rods, and the upper ends of the two pull rods slide through the bottom surface of the circular frame and extend to the top of the circular frame.

[0013] Preferably, two movable columns are fixedly installed on the side surfaces of the two T-shaped blocks, and two arc plates are provided. The other ends of the multiple movable columns slide through the T-shaped grooves and are fixedly connected to the outer walls of the two arc plates. The top surfaces of the two arc plates are respectively provided with arc grooves, and a rotating plate is slidably installed on the inner walls of the arc grooves. The side surface of the rotating plate is elastically connected to the inner wall of one side of the arc groove through elastic member 2, a supporting column is fixedly installed on the top surface of the rotating plate, a supporting plate is fixedly installed on the upper end of the supporting column, and a push rod is fixedly installed on the top surface of the support plate.

[0014] Preferably, a support rod is fixedly mounted on the side of the support plate, and the other end of the support rod is fixedly connected to the outer wall of the arc-shaped brush.

[0015] A temperature-liquid-level integrated liquid level meter measurement method comprises the following steps: Step 1: S1: The lower end of the liquid level meter is in contact with the liquid, and the electronic compartment is connected to the temperature sensor signal through the lead wire, so that the temperature signal and the liquid level signal of the coaxial capacitor can be obtained; S2: The coaxial capacitor is charged and discharged through the internal measurement unit to accurately obtain the liquid level signal, and the liquid level data is temperature compensated according to the temperature data; Step 2: S3: Protect the outer side of the level gauge by means of a protective plate and a movable frame; Step 3: S4: By pulling the pull rod, the movable frame below is driven to open, and the arc-shaped brush is driven to contact the outer wall of the outer tube; S5: Push the push rod to drive the arc-shaped brush to remove impurities on the outer tube to ensure measurement accuracy.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the moving plate to move upward by pulling the pull rod, and the moving plate drives the T-shaped block to move upward and horizontally, and the T-shaped block drives the adjustment plate and the movable frame to rotate and open, and at the same time the T-shaped block drives the arc plate to move through the moving column, and the arc plate drives the arc brush to contact the outer wall of the outer tube, pushes the push rod, drives the support plate, the support rod and the arc brush to rotate, so that the arc brush removes impurities on the outer wall of the outer tube, and these impurities are not easy to accumulate on the outer wall of the outer tube to cause obstruction, thereby ensuring the accuracy and reliability of measurement; By setting the protective plate and the movable frame, the protective plate protects the outer wall of the outer tube, and the movable frame protects the lower end of the outer tube, thereby comprehensively protecting the outer wall of the outer tube, so that the device is not easily impacted by larger particles in the liquid during measurement, thereby improving the safety and stability of the device; By integrating the electronic compartment, outer tube, glass fiber tube, insulating skin, inner electrode and temperature sensor, the dual precise measurement of liquid level and temperature is achieved. The electronic compartment is connected to the temperature sensor signal through the lead wire, which can obtain the temperature signal and liquid level signal. Through the internal measurement unit, the charging and discharging operation is performed to accurately obtain the liquid level signal, and the liquid level data is temperature compensated according to the temperature data, thereby significantly improving the accuracy and stability of the liquid level measurement, especially in applications under different temperature environments, ensuring the authenticity and reliability of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is an exploded view of the three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the brush of the present invention; Figure 4 It is a cross-sectional schematic diagram of the three-dimensional structure of the circular frame of the present invention; Figure 5 For the present invention Figure 4Enlarged view of point A in the middle; Figure 6 It is a schematic diagram of the three-dimensional structure of the movable frame of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 8 It is a schematic cross-sectional view of the three-dimensional structure of the curved plate of the present invention; Fig. 9 For the present invention Figure 8 Enlarged view of point C in the middle; Fig.10 It is a cross-sectional schematic diagram of the three-dimensional structure of the outer tube of the present invention; Fig.11 This is a measurement principle diagram of the temperature-liquid-level integrated level meter of the present invention; Fig.12 The invention is a schematic diagram of the TDC measurement principle; Fig.13 The sampling principle diagram of the invention; Fig.14 For the invention Fig.13 A line graph of the sampling schematic provided in ; Fig.15 Schematic diagram of temperature measurement for the invention Fig.16 This is a diagram of the TDC measurement time interval of the invention.

[0018] In the figure: Electronic compartment; 101, outer tube; 102, glass fiber tube; 103, insulation skin; 104, temperature sensor; 105, inner electrode; 106, lead wire; 2. Protective mechanism; 201. Fixed plate; 202. Round frame 1; 203. Protective plate; 204. Round frame 2; 205. Movable frame; 3. Cleaning mechanism; 301. Through slot; 302. Adjusting plate; 303. T-shaped block; 304. Moving plate; 305. T-shaped slot; 306. Pull rod; 307. Fixed box; 308. Semicircular plate; 309. Connecting block; 310. Elastic member 1; 311. Arc plate; 312. Arc slot; 313. Rotating plate; 314. Elastic member 2; 315. Support column; 316. Support plate; 317. Push rod; 318. Support rod; 319. Arc brush; 320. Moving column. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] like Figure 1-10 As shown, the present application provides a temperature-liquid-level integrated level meter and a measurement method, including: an electronic compartment 1 and a temperature sensor 104, the electronic compartment 1 is connected to the temperature sensor 104 by a lead 106; Specifically, Figure 1-10 As shown, a measuring unit is provided inside the electronic warehouse 1, an outer tube 101 and a glass fiber tube 102 are fixedly installed on the bottom surface of the electronic warehouse 1, the glass fiber tube 102 and the outer tube 101 are coaxially installed, and the glass fiber tube 102 is located inside the outer tube 101, an inner electrode 105 is installed inside the glass fiber tube 102, the glass fiber tube 102 is covered with a conductive layer, the outside of the conductive layer is covered with an insulating skin 103, the outer surface of the temperature sensor 104 and the outer surface of the lead 106 are covered with a conductive metal film, the glass fiber tube 102 and the outer tube 101 form a coaxial capacitor, the glass fiber tube 102 is a hollow structure, the inner wall is covered with a conductive material, which is used to form the inner core part of the coaxial capacitor and serves as an installation support for the temperature sensor 104, the outer tube 101 is in contact with the liquid, and the liquid level information is fed back to the TDC measurement unit of the electronic warehouse 1 through capacitance changes.

[0022] In this embodiment: the outside of the conductive layer is covered with an insulating skin 3 to ensure electrical insulation between the inner electrode 6 and the outer tube 5. When the liquid height changes, the capacitance between the inner electrode 6 and the outer tube 5 changes, and this capacitance change is converted into liquid level height data through the TDC measurement unit.

[0023] A protection mechanism 2 is provided below the electronic warehouse 1. The protection mechanism 2 is provided below the electronic warehouse 1. The protection mechanism 2 includes a round frame 202. A protection plate 203 is fixedly installed on the bottom surface of the round frame 202. The protection mechanism 2 is used to protect the liquid level meter. Specifically, Figure 1-10 As shown, a fixing plate 201 is fixedly installed on the side of the electronic warehouse 1, and the bottom surface of the fixing plate 201 is fixedly connected to the top surface of the circular frame 202 by bolts, and the number of protective plates 203 is multiple.

[0024] In this embodiment, a plurality of protective plates 203 are provided so as to protect the outer wall of the outer tube 101 and prevent the outer tube 101 from being damaged.

[0025] Specifically, Figure 1-10As shown, a second circular frame 204 is fixedly installed on the bottom surface of the protection plate 203 , and two movable frames 205 are arranged inside the second circular frame 204 .

[0026] In this embodiment, the movable frame 205 is provided to protect the lower end of the outer tube 101, thereby ensuring that the outer tube 101 is fully protected and not easily damaged.

[0027] A cleaning mechanism 3 is arranged below the circular frame 202. The cleaning mechanism 3 includes an arc-shaped brush 319 located below the circular frame 202. An arc-shaped plate 311 is arranged on one side of the arc-shaped brush 319. A movable plate 304 is arranged on one side of the arc-shaped plate 311. The cleaning mechanism 3 is used to clean impurities on the surface of the liquid level meter.

[0028] Specifically, Figure 1-10 As shown, two through slots 301 are formed through the top surface of the second circular frame 204, and adjustment plates 302 are rotatably installed on the inner walls of the two through slots 301. The sides of the two adjustment plates 302 are fixedly connected to the sides of the two movable frames 205 respectively, and T-shaped blocks 303 are hinged on the sides of one end of the two adjustment plates 302 respectively, and two movable plates 304 are provided.

[0029] In this embodiment, the movable frame 205 can be driven to rotate and open by the rotation of the adjusting plate 302 inside the through slot 301, so that impurities on the outer wall of the outer tube 101 are not easily blocked when falling.

[0030] Specifically, Figure 1-10 As shown, the bottom surfaces of the two movable plates 304 are respectively provided with T-shaped grooves 305, the inner walls of the two T-shaped grooves 305 are respectively slidably connected to the sides of the two T-shaped blocks 303, and a plurality of fixed boxes 307 are fixedly installed on the top surface of the circular frame 204, and the outer walls of the plurality of fixed boxes 307 are respectively provided with through openings.

[0031] In this embodiment, the T-shaped block 303 is limited by the T-shaped slot 305 , and when the movable plate 304 moves up and down through the T-shaped slot 305 , the T-shaped block 303 is driven to move horizontally on the inner wall of the T-shaped slot 305 .

[0032] Specifically, Figure 1-10 As shown, semicircular plates 308 are slidably installed on the inner walls of the multiple fixed boxes 307, and connecting blocks 309 are fixedly installed on the outer walls of the multiple semicircular plates 308. The other side surfaces of the multiple connecting blocks 309 are fixedly connected to the side surfaces of the two movable plates 304, and the side surfaces of the multiple connecting blocks 309 are slidably connected to the inner walls of the multiple through openings. The top surfaces of the multiple semicircular plates 308 are elastically connected to the inner walls of the upper ends of the multiple fixed boxes 307 through elastic members 310, and the top surfaces of the two movable plates 304 are fixedly installed with pull rods 306, and the upper ends of the two pull rods 306 slide through the bottom surface of the circular frame 202 and extend to the top of the circular frame 202.

[0033] In this embodiment: an elastic force is applied to the semicircular plate 308 by an elastic member 310, and the movable plate 304 is limited by the side surfaces of a plurality of connecting blocks 309 which are respectively slidably connected to the inner walls of the plurality of openings and cooperate with the semicircular plate 308, thereby ensuring that the movable plate 304 moves more smoothly.

[0034] Specifically, Figure 1-10 As shown, two movable columns 320 are fixedly installed on the sides of the two T-shaped blocks 303, and two arc-shaped plates 311 are provided. The other ends of the multiple movable columns 320 slide through the T-shaped grooves 305 and are fixedly connected to the outer walls of the two arc-shaped plates 311. The top surfaces of the two arc-shaped plates 311 are respectively provided with arc-shaped grooves 312, and a rotating plate 313 is slidably installed on the inner wall of the arc-shaped groove 312. The side of the rotating plate 313 is elastically connected to the inner wall of one side of the arc-shaped groove 312 through an elastic member 314. A supporting column 315 is fixedly installed on the top surface of the rotating plate 313, a supporting plate 316 is fixedly installed on the upper end of the supporting column 315, and a push rod 317 is fixedly installed on the top surface of the support plate 316.

[0035] In this embodiment: the T-block 303 moves, driving the movable column 320 to move, and the movable column 320 drives the arc plate 311 to move, thereby driving the arc brush 319 to move and contact the outer wall of the outer tube 101, and the elastic member 314 is provided to apply elastic force to the rotating plate 313 to ensure that the rotating plate 313 is in the initial position.

[0036] Specifically, Figure 1-10 As shown, a support rod 318 is fixedly installed on the side of the support plate 316, and the other end of the support rod 318 is fixedly connected to the outer wall of the arc-shaped brush 319.

[0037] In this embodiment, by pushing the push rod 317 to rotate, the support plate 316 and the support rod 318 are driven to rotate, and the support rod 318 drives the arc brush 319 to rotate, so that the arc brush 319 removes impurities on the outer wall of the outer tube 101.

[0038] A temperature-liquid-level integrated liquid level meter measurement method comprises the following steps: Step 1: S1: The lower end of the liquid level meter is in contact with the liquid, and the electronic compartment is connected to the temperature sensor signal through the lead wire, so that the temperature signal and the liquid level signal of the coaxial capacitor can be obtained; S2: The coaxial capacitor is charged and discharged through the internal measurement unit to accurately obtain the liquid level signal, and the liquid level data is temperature compensated according to the temperature data; Electronic warehouse 1 obtains the charging and discharging time of the coaxial capacitor and processes it to obtain the liquid level data; Acquire the temperature signal sent by the temperature sensor 104 and process it into temperature data; Perform temperature compensation on the liquid level data according to the temperature data; A data processing unit is provided inside, and final temperature data and final liquid level data are generated through the data processing unit.

[0039] The charge and discharge time of the measured sensing capacitor and the reference capacitor are measured by a high-precision TDC (time-to-digital converter). This measurement process is repeated on the two capacitors. The ratio of the calculated results will give the absolute measurement value and the temperature characteristics of the resistor and comparator. These data do not need to be converted by AD and directly enter the microcontroller for analysis and comprehensive compensation, and then converted into industrial standard signals that are easy to transmit. When the coaxial capacitor is charged, the measuring unit receives a start signal; When the coaxial capacitor is fully charged, the measuring unit receives a stop signal; The time interval between the start signal and the stop signal sent by the coaxial capacitor is acquired and processed by the measuring unit; The TDC measurement unit uses the absolute time delay of the signal through the logic gate to accurately quantify the time interval; the highest resolution of TDC depends on the minimum gate propagation delay time of the chip. The measurement starts with the START signal and ends with the STOP signal. According to the position of the ring oscillator and the value of the coarse counter, the time difference between START and STOP can be calculated; The sensing capacitor and the reference capacitor are connected to a resistor to form a low-pass filter. The sensing capacitor and the reference capacitor have the same range value to reduce the gain error. The capacitor is first charged to the power supply voltage and then discharged through the resistor. The time to discharge to any voltage will be measured by a high-precision TDC (time to digital converter). A signal processor is provided in the electronic compartment 1, and the processor processes the data measured by the measuring unit; The measuring unit further includes a TDC measuring unit and an RLC measuring unit. The TDC measuring unit is used to measure the time interval, and the RLC measuring unit is used to measure the capacitance, inductance and resistance. The signal processor calculates and compensates based on the data measured by the TDC measuring unit and the RLC measuring unit in combination with the temperature data of the temperature sensor 104. When the time difference between the rising and falling measurements of two pulses is tens to hundreds of ns, the traditional pulse counting method for measuring pulse width is no longer applicable. This is because the narrower the pulse to be measured, the higher the clock frequency required, and the higher the chip performance requirements. For example, when a 1ns measurement error is required, the clock frequency needs to be increased to 1GHz. At this time, it is difficult for a general counter chip to work normally, and it will also bring many problems such as circuit board wiring, material selection, and processing. In this embodiment, TDC uses the absolute transmission time of a signal through a logic gate circuit to propose a new time interval measurement method. The time interval between the START signal and the STOP signal is determined by the number of logic gates passed, and the propagation delay time of the logic gate can be accurately determined by the integrated circuit process. At the same time, since the gate circuit transmission time is greatly affected by temperature and power supply voltage, a phase locking and calibration circuit is designed inside the chip; Among them, in the digital sensing unit, the RLC measurement unit is used to measure the values ​​of inductance (L), capacitance (C) and resistance (R), and the RLC counter is used to count the output of the RLC measurement unit, record the electrical parameter values ​​measured by the RLC measurement unit, and provide accurate measurement counting results as basic data for subsequent calculations and signal processing; and there are two TDC measurement units, which are used to measure the charging and discharging time of the coaxial capacitor in the liquid level meter, and then calculate the capacitance change, so as to deduce the liquid level change, and TDC converts the time interval into a digital signal; correspondingly, the coarse value memory is used to store and temporarily save the preliminary measurement data from the RLC measurement unit and TDC; In order to correct the errors in the measurement process, especially when there are temperature changes, environmental noise or other influencing factors, to ensure the accuracy of liquid level and temperature measurement, this embodiment provides a compensation mode: The temperature sensor 104 detects the temperature of the environment where the liquid level meter is located, and transmits the temperature data to the signal processor in the electronic compartment 1; the signal processor corrects the capacitance value of the liquid level measurement according to the temperature data provided by the temperature sensor 104. Since temperature changes may cause the capacitance value of the capacitor to drift, temperature compensation can correct this change to ensure the accuracy of the liquid level data; The temperature compensation calculation is usually performed by the ALU, combining the temperature data and the liquid level measurement data for accurate correction; when the TDC measurement unit performs measurement, it may be affected by external electromagnetic interference or other environmental noise. For this reason, the system will stabilize the measurement signal through the clock divider and PLL phase lock to reduce the impact of noise interference on the measurement results; For the compensation mode: the internal parasitic capacitance is compensated. This parasitic capacitance not only includes the parasitic capacitance on the chip but also includes the compensation of the parasitic capacitance of all components in the circuit after the analog switch. If not compensated, the parasitic capacitance will have a negative impact on the temperature gain error. The compensated gain error range is very small, and the range is <10ppm at full scale.

[0040] The K factor of the temperature sensor 104 strain resistor is temperature-dependent. When the temperature rises, K will decrease. If the temperature of the strain resistor is known, the error can be easily corrected. TDC provides an option to measure temperature by simply connecting the external temperature sensor 104 to the corresponding pin; The measurement accuracy is limited by the quantization error of the measurement result; The quantization error of temperature measurement is 1 / 214=61ppm; the sensitivity of a temperature-sensitive platinum resistor is about 3920ppm / K. In this case, the accuracy of temperature measurement is about 0.015 degrees Celsius, which is sufficient to meet the requirements of compensation resistance strain measurement; of course, other types of temperature sensors 104 can also be used, such as KTY82-210; TDC provides an interface with an 8-bit microcontroller, including an 8-bit data bus, 4-bit address lines that can operate 16 registers, and control lines such as read, write, and chip select. In order to simplify the interface design, an address latch line (ALE) is also provided. TDC uses the propagation delay of the signal through the internal gate circuit to perform high-precision time interval measurement. The pre-matching device is used to expand the maximum measurable time interval in the measurement range, and the resolution remains unchanged. In this mode, the high-speed unit of TDC does not measure the entire time interval, but only measures the interval time from the START or STOP signal to the adjacent reference clock rising edge; Since the temperature sensor 104 and the liquid level sensor operate in different frequency bands, placing a charged conductor in the middle of the capacitive sensor may cause abnormal disturbance of the capacitance. This embodiment provides a shielding method: The measuring unit measures in an alternating manner; the alternating manner includes obtaining a temperature signal once after obtaining two liquid level signals; Firstly, when arranging the temperature sensor 104, a conductive metal film is used to completely cover the temperature sensor 104 and the corresponding wires, which not only meets the temperature attenuation requirements but also realizes electromagnetic shielding; secondly, the capacitance acquisition and temperature measurement are performed alternately, the acquisition capacitance is performed twice and the temperature measurement is performed once, and this cycle is repeated to avoid mutual interference at the same time; finally, an independent measurement circuit design is selected in the circuit board to avoid signal acquisition interference caused by mutual interference between circuits; Step 2: S3: Protect the outer side of the level gauge by means of a protective plate and a movable frame; Step 3: S4: By pulling the pull rod, the movable frame below is driven to open, and the arc-shaped brush is driven to contact the outer wall of the outer tube; S5: Push the push rod to drive the arc-shaped brush to remove impurities on the outer tube to ensure measurement accuracy.

[0041] The specific solution is as follows: the lower end of the liquid level meter is in contact with the liquid, and the electronic compartment 1, the outer tube 101, the glass fiber tube 102, the insulating skin 103, the inner electrode 105 and the temperature sensor 104 are integrated to realize the dual accurate measurement of the liquid level and the temperature. The electronic compartment 1 is connected to the temperature sensor 104 signal through the lead 106, and can obtain the temperature signal and the liquid level signal. Through the internally arranged measuring unit, the charging and discharging operation is performed to accurately obtain the liquid level signal, and the liquid level data is temperature compensated according to the temperature data, thereby significantly improving the accuracy and stability of the liquid level measurement, especially in the application under different temperature environments, ensuring the authenticity and reliability of the data, and setting the protective plate 203 and the movable frame 205, the protective plate 203 protects the outer wall of the outer tube 101, and the movable frame 205 protects the lower end of the outer tube 101, thereby The outer wall of the outer tube 101 can be fully protected, so that the device is not easily hit by larger particles in the liquid during measurement, thereby improving the safety and stability of the device, pulling the pull rod 306 to drive the movable plate 304 to move upward, and the movable plate 304 drives the T-shaped block 303 to move upward and horizontally, and the T-shaped block 303 drives the adjustment plate 302 and the movable frame 205 to rotate and open, and at the same time, the T-shaped block 303 drives the arc plate 311 to move through the movable column 320, and the arc plate 311 drives the arc brush 319 to contact the outer wall of the outer tube 101, and pushes the push rod 317 to drive the support plate 316, the support rod 318 and the arc brush 319 to rotate, so that the arc brush 319 removes impurities on the outer wall of the outer tube 101, and these impurities are not easy to accumulate on the outer wall of the outer tube 101 to cause obstruction, thereby ensuring the accuracy and reliability of measurement.

[0042] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary; within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0043] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A temperature and liquid level integrated level meter, comprising: An electronic warehouse (1) and a temperature sensor (104), wherein the electronic warehouse (1) is connected to the temperature sensor (104) via a lead wire (106) for signal transmission, and is characterized in that: A protection mechanism (2), the protection mechanism (2) being arranged below the electronic compartment (1), the protection mechanism (2) comprising a circular frame (202), a protection plate (203) being fixedly mounted on the bottom surface of the circular frame (202), the protection mechanism (2) being used to protect the liquid level meter; A cleaning mechanism (3), the cleaning mechanism (3) being arranged below the circular frame one (202), the cleaning mechanism (3) comprising an arc-shaped brush (319) located below the circular frame one (202), an arc-shaped plate (311) being arranged on one side of the arc-shaped brush (319), and a movable plate (304) being arranged on one side of the arc-shaped plate (311), the cleaning mechanism (3) being used to clean impurities on the surface of the liquid level meter.

2. The temperature-liquid-level integrated level gauge according to claim 1, characterized in that: An outer tube (101) and a glass fiber tube (102) are fixedly mounted on the bottom surface of the electronic compartment (1); the glass fiber tube (102) and the outer tube (101) are coaxially mounted, and the glass fiber tube (102) is located inside the outer tube (101); an inner electrode (105) is mounted inside the glass fiber tube (102); the glass fiber tube (102) is coated with a conductive layer, and the outside of the conductive layer is coated with an insulating layer (103); and the outer surface of the temperature sensor (104) and the outer surface of the lead wire (106) are coated with a conductive metal film.

3. The temperature-liquid-level integrated level gauge according to claim 1, characterized in that: A fixing plate (201) is fixedly mounted on the side of the electronic warehouse (1); the bottom surface of the fixing plate (201) is fixedly connected to the top surface of the circular frame (202) via bolts; and the number of the protective plates (203) is plural.

4. The temperature-liquid-level integrated level gauge according to claim 3, characterized in that: A second circular frame (204) is fixedly mounted on the bottom surface of the plurality of protection plates (203), and two movable frames (205) are arranged inside the second circular frame (204).

5. The temperature-liquid-level integrated level gauge according to claim 4, characterized in that: The top surface of the second circular frame (204) is provided with two through slots (301), the inner walls of the two through slots (301) are rotatably mounted with adjustment plates (302), the sides of the two adjustment plates (302) are respectively fixedly connected to the sides of the two movable frames (205), the sides of one end of the two adjustment plates (302) are respectively hinged with T-shaped blocks (303), and two movable plates (304) are provided.

6. The temperature-liquid-level integrated level gauge according to claim 5, characterized in that: The bottom surfaces of the two movable plates (304) are respectively provided with T-shaped grooves (305), the inner walls of the two T-shaped grooves (305) are respectively slidably connected to the side surfaces of the two T-shaped blocks (303), and a plurality of fixed boxes (307) are fixedly mounted on the top surface of the second circular frame (204), and the outer walls of the plurality of fixed boxes (307) are respectively provided with through openings.

7. The temperature-liquid-level integrated level gauge according to claim 6, characterized in that: The inner walls of the plurality of fixed boxes (307) are slidably mounted with semicircular plates (308), the outer walls of the plurality of semicircular plates (308) are fixedly mounted with connecting blocks (309), the other side surfaces of the plurality of connecting blocks (309) are fixedly connected to the side surfaces of the two movable plates (304), the side surfaces of the plurality of connecting blocks (309) are slidably connected to the inner walls of the plurality of through openings, the top surfaces of the plurality of semicircular plates (308) are elastically connected to the inner walls of the upper ends of the plurality of fixed boxes (307) through elastic members (310), the top surfaces of the two movable plates (304) are fixedly mounted with pull rods (306), the upper ends of the two pull rods (306) slide through the bottom surface of the circular frame (202) and extend to the top of the circular frame (202).

8. The temperature-liquid-level integrated level gauge according to claim 7, characterized in that: Two movable columns (320) are fixedly mounted on the side surfaces of the two T-shaped blocks (303), two arc-shaped plates (311) are provided, and the other ends of the plurality of movable columns (320) slide through the T-shaped groove (305) and are fixedly connected to the outer walls of the two arc-shaped plates (311), and the top surfaces of the two arc-shaped plates (311) are respectively provided with arc-shaped grooves (312), and a rotating plate (313) is slidably mounted on the inner wall of the arc-shaped groove (312), and the side surface of the rotating plate (313) is elastically connected to the inner wall of one side of the arc-shaped groove (312) through a second elastic member (314), and a supporting column (315) is fixedly mounted on the top surface of the rotating plate (313), and a supporting plate (316) is fixedly mounted on the upper end of the supporting column (315), and a push rod (317) is fixedly mounted on the top surface of the support plate (316).

9. The temperature-liquid-level integrated level gauge according to claim 8, characterized in that: A support rod (318) is fixedly mounted on the side of the support plate (316), and the other end of the support rod (318) is fixedly connected to the outer wall of the arc-shaped brush (319).

10. A method for measuring a temperature-liquid-level integrated liquid level meter, using the temperature-liquid-level integrated liquid level meter according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: S1: The lower end of the liquid level meter is in contact with the liquid, and the electronic compartment is connected to the temperature sensor signal through the lead wire, so that the temperature signal and the liquid level signal of the coaxial capacitor can be obtained; S2: The coaxial capacitor is charged and discharged through the internal measurement unit to accurately obtain the liquid level signal, and the liquid level data is temperature compensated according to the temperature data; Step 2: S3: Protect the outer side of the level gauge by means of a protective plate and a movable frame; Step 3: S4: By pulling the pull rod, the movable frame below is driven to open, and the arc-shaped brush is driven to contact the outer wall of the outer tube; S5: Push the push rod to drive the arc-shaped brush to remove impurities on the outer tube to ensure measurement accuracy.

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