CN212747979U

CN212747979U - Active inspection type liquid level sensing system

Info

Publication number: CN212747979U
Application number: CN202021662707.6U
Authority: CN
Inventors: 张桂林
Original assignee: Wuhan Leishier Photoelectric Information Engineering Co ltd
Current assignee: Wuhan Leishier Photoelectric Information Engineering Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-03-19
Anticipated expiration: 2030-08-12

Abstract

The utility model provides a formula liquid level sensing system is patrolled and examined in initiative. The liquid level sensing system comprises a sensing part and a demodulating part, wherein the sensing part comprises a supporting pipe, an insulating heat conducting core, a stepping motor, a temperature sensor and an electric heating wire, wherein the temperature sensor and the electric heating wire are arranged in the insulating heat conducting core; the insulating heat conducting core is arranged in the supporting tube and is fixed and conducts heat through the heat conducting material filled in the supporting tube, the tail ends of the electric heating wire and the temperature sensor are led out from the through hole end of the supporting tube, and the control end of the stepping motor is connected with the tail end of the temperature sensor; the demodulation part comprises a temperature detection module, a motor driving module, a power regulation module and a control system. The utility model discloses can initiatively patrol and examine and find out liquid gas interface temperature step position, can realize the level measurement of different precisions, can not exert an influence to the normal work of high temperature high-voltage apparatus.

Description

Active inspection type liquid level sensing system

Technical Field

The patent of the utility model relates to a formula liquid level sensing system is patrolled and examined in initiative that can use in high temperature high pressure environment can be used to the liquid level of stabiliser, evaporimeter in the water-cooled reactor nuclear power station to be tracked, and molten salt liquid level in liquid metal liquid level, the molten salt reactor in the metal reactor (sodium-cooled, lead bismuth cooling reactor) belongs to sensing measurement technical field.

Background

The nuclear industry is a strategic industry in China, wherein the measurement of the operating parameters of nuclear reactors is the guarantee for ensuring the safe operation of nuclear power stations. The nuclear reactor adopts coolants such as water, liquid metal, molten salt and the like to lead heat generated by the reactor core out to do work for power generation, and the loss of the coolants in various reactor accidents brings the risk of bare burning of the reactor core due to the loss of cold sources. Therefore, the coolant liquid level in various devices in the nuclear reactor, especially the coolant liquid level in a primary circuit voltage stabilizer, is an operation parameter which needs to be closely monitored by the nuclear reactor, and accurate and reliable liquid level measurement has very important significance.

Along with the development of science and technology, liquid level measurement methods are more, mainly including a capacitance method, a pressure difference method and a magnetic plate turning method, and recently, new methods mainly developed include an ultrasonic method, an optical fiber method and the like. However, the nuclear reactor system is in a complex application environment with high temperature, high pressure, strong radiation and corrosion, for example, the pressure of a primary circuit of a pressurized water reactor reaches 15MPa, and the temperature is above 300 ℃, so that the nuclear reactor system has higher requirements on the complex environment adaptability of a liquid level meter. The magnetic turning plate liquid level meter needs to measure after high-temperature medium in a measured container is drained and cooled, so as to prevent demagnetization at high temperature. Opening drainage to the upper and lower extreme of container has not only increased high temperature high pressure container breaching risk, and measurement accuracy and response speed all have the decline moreover. In the environment that steam exists at the top of a liquid phase of an ultrasonic liquid level meter, which is applied to a voltage stabilizer, an evaporator and the like, high-density steam locally appearing at the top of the liquid phase influences sound wave penetration and seriously interferes a measurement result. In addition, the nuclear reactor system has high requirements on the reliability and the maintenance convenience of the sensor, generally, the service life of the sensor is required to be more than three years, and the sensor has maintainability without influencing the normal operation of the system.

In order to deal with the above complicated and harsh conditions, it is urgently needed to develop a novel liquid level meter for accurately tracking a liquid-gas interface under a high-temperature and high-pressure environment.

Disclosure of Invention

The utility model provides a can be at the initiative formula liquid level sensing system that patrols and examines that high temperature high pressure environment used according to prior art's not enough, this liquid level sensor system can solve the problem that has steam interference measuring result under the high temperature high pressure environment, and influences lessly to the containment structure, has higher reliability and maintainability.

The technical scheme that the utility model adopts for solving its technical problem is an active inspection type liquid level sensing system, the liquid level sensing system includes sensing part and demodulation part, the sensing part includes temperature sensor, heating wire, stay tube, insulating heat conduction core, step motor and sets up the sealing interface on high temperature high-pressure equipment, the stay tube is the metal pipe of one end sealed, one end through-hole, its sealed end stretches into high temperature high-pressure equipment through the sealing interface, the through-hole end lies in high temperature high-pressure equipment outside; the temperature sensor and the heating wire are both arranged in the insulated heat conducting core, the insulated heat conducting core provided with the temperature sensor and the heating wire penetrates into the supporting pipe from top to bottom, and the heat is fixed and conducted through the heat conducting material filled in the supporting pipe, the tail ends of the heating wire and the temperature sensor are both led out from the end, outside the high-temperature and high-pressure equipment, of the through hole of the supporting pipe, the leading-out end of the heating wire and the tail end of the temperature sensor are insulated and isolated from the supporting pipe, the control end of the stepping motor is connected with the tail end of the temperature sensor, and the temperature sensor is controlled to; the demodulation part comprises a temperature detection module, a motor driving module, a power regulation module and a control system, wherein the power regulation module is connected with the heating wire, the temperature detection module is connected with a temperature sensor, the motor driving module is connected with the stepping motor, and the temperature detection module, the motor driving module and the power regulation module are all in communication connection with the control system to receive and control signals.

The utility model discloses further technical scheme: the demodulation part also comprises an alarm system and a liquid level display and operation module which are in communication connection with the control system, and the control system carries out human-computer interaction processing through the liquid level display and operation module; and the alarm system receives the liquid level alarm information sent by the control system, carries out alarm processing and feeds back the result to the control system.

The utility model discloses further technical scheme: the insulating heat conduction core is an insulating ceramic rod, the outer diameter of the insulating heat conduction core is matched with the inner diameter of the supporting tube, the insulating heat conduction core is made of quartz, corundum or mica, the insulating heat conduction core is formed by sequentially splicing a whole ceramic rod or a plurality of ceramic blocks, an electric heating wire through hole is formed in the insulating heat conduction core, one or two or more temperature measurement channels are arranged around the electric heating wire through hole in a surrounding mode, the electric heating wire is arranged in the electric heating wire channel and is fixed through a heat conduction material filled in the electric heating wire channel and conducts heat of the electric heating wire uniformly, and the temperature sensor is arranged in the temperature measurement channels.

The utility model discloses better technical scheme: the stepping motor selects a linear displacement direct current brushless motor or a servo motor, a temperature sensor connecting platform is arranged on the stepping motor, one or two or more temperature sensor mounting fixtures are arranged on the connecting platform, tail end clamping of the corresponding temperature sensor is achieved through the temperature sensor mounting fixtures, the stepping motor is driven through a motor driving module to be used for controlling the temperature sensor to move up and down, and the stroke of the stepping motor is larger than the variation range of the liquid level to be monitored.

The utility model discloses better technical scheme: the sealing interface comprises a base, a sealing gasket and a clamping sleeve, the base is welded or in threaded connection with the high-temperature high-pressure equipment, through holes with the diameters matched with the outer diameters of the supporting pipes are correspondingly formed in the middle of the base, the sealing gasket and the clamping sleeve, the supporting pipes penetrate into the high-temperature high-pressure equipment from the through holes and are sealed and fixed by the sealing gasket and the clamping sleeve, and the sealing gasket is formed by processing annealed red copper, polytetrafluoroethylene or rubber sealing materials.

The utility model discloses better technical scheme: the power adjusting module is directly connected with the tail end of the electric heating wire and controls the heating power of the electric heating wire; the temperature detection module is connected with the tail end of the temperature sensor through a signal wire and used for monitoring the temperature of the temperature sensor.

The utility model discloses better technical scheme: the electric heating wire is a high-temperature-resistant alloy wire selected from any one of high-quality nickel-chromium and iron-chromium-aluminum, the outer diameter of the electric heating wire is tightly matched with the electric heating wire through hole of the insulated heat conducting core, the working temperature of the electric heating wire is controlled by the power adjusting module, and the heat of the electric heating wire is transferred to the supporting tube through the insulated heat conducting core.

The utility model discloses better technical scheme: the heat conduction material is made of any one of heat conduction silicone grease, heat conduction silicone oil, boron nitride or magnesium oxide high-temperature-resistant insulating powder.

The utility model discloses better technical scheme: the supporting tube is made of a hollow stainless steel tube, a copper tube, a nickel alloy tube or a titanium alloy tube, the inner wall and the outer wall of the supporting tube are smooth, and the insulating heat conduction core provided with the temperature sensor and the electric heating wire is arranged in the supporting tube from the open end of the supporting tube until the insulating heat conduction core reaches the bottom of the sealing end.

The utility model discloses better technical scheme: the temperature sensor is an electrical temperature sensor or an optical fiber type temperature sensor, the electrical temperature sensor comprises a thermocouple and a thermal resistor, and the optical fiber type temperature sensor comprises an optical fiber grating and an optical fiber F-P, M-Z; the number of the temperature sensors is one or two or more; when the temperature sensor is single, the stroke of the stepping motor completely covers the variation range of the liquid level to be monitored and a margin is reserved; when the number of the temperature sensors is two or more, the stroke superposition of each temperature sensor completely covers the variation range of the liquid level to be monitored and a margin is reserved; the temperature measuring range of the temperature sensor is larger than the working temperature ranges of high-temperature liquid and electric heating wires in the high-temperature and high-pressure equipment, and the measuring precision of the temperature sensor is higher than the temperature step value at the liquid-gas interface in the high-temperature and high-pressure equipment.

The utility model discloses step motor's stroke and displacement precision can reciprocate through step motor accurate control temperature sensor according to the measuring range and the required precision design of liquid level, find liquid gas interface temperature step position, again based on temperature sensor's initial position and step motor amount of movement to the accuracy obtains current liquid level value. The utility model discloses a control system is based on singlechip or DSP board development design, and its function divide into control power adjusting module heating heater to operating temperature, and control motor drive module reciprocates temperature sensor, receives the temperature information of handling temperature detection module and adjusts the step motor amount of movement according to patrolling and examining algorithm, sends ultralow or super high liquid level early warning and normal liquid level measurement information to and human-computer interaction.

The utility model provides a heating wire is high temperature resistant alloy silk of quality, and its external diameter closely cooperates with the heating wire through-hole of insulating heat conduction core, and its operating temperature is controlled by power adjusting module, and its heat transmits to the stay tube through insulating heat conduction core. The length and the wall thickness of the supporting tube in the utility model can be designed according to the size and the pressure-resistant requirement of the device to be measured, and can be made of stainless steel tubes, copper tubes, nickel alloy tubes, titanium alloy tubes and the like according to the corrosion characteristic requirements of the measured liquid and gas; the inner wall and the outer wall of the supporting tube need to reach certain smoothness, so that the outer wall is not easy to adhere to measuring liquid, and the insulating heat conducting core is easily arranged in the supporting tube.

The working mechanism of the utility model is that: the high-temperature resistant heating wire is electrified to heat, and the heating power of the high-temperature resistant heating wire is controlled by the power regulating module; in the liquid level monitoring, due to the liquid evaporation effect and the difference of specific heat capacity between liquid and other liquid, the heat exchange performance difference of media on two sides of the liquid level at the surface of the supporting tube is caused, so that a temperature step exists between the supporting tube and the insulating heat conduction core at the liquid-gas interface in the axial direction of the supporting tube and the insulating heat conduction core. The temperature sensor is accurately controlled by the stepping motor to move up and down, the temperature step position of the liquid-gas interface is found, and then the current liquid level value is accurately obtained based on the initial position of the temperature sensor and the moving amount of the stepping motor.

The utility model has the advantages that:

(1) the utility model adopts the stepping motor to accurately control the movement of the temperature sensor, actively patrol and find out the temperature step position of the liquid-gas interface, the maturity of the basic technology is high, the system cost is low, and the reliability is good; liquid level measurement with different precision can be realized by adjusting the moving speed and the step pitch of the stepping motor;

(2) the utility model adopts the installation mode of the supporting tube and the sealing component, thus realizing the non-contact measurement between the sensor and the liquid, and not influencing the normal work of the high-temperature and high-pressure equipment when the sensor is overhauled or disassembled and replaced;

(3) the utility model can be used in the environment with high pressure by designing the structure and material of the supporting tube; meanwhile, the liquid level measurement in a high-temperature environment below 1000 ℃ can be met by selecting a proper temperature sensor, an electric heating wire, a heat conduction material and an insulating heat conduction core.

(4) The utility model discloses an insulating heat conduction core installation temperature sensor, its temperature sensor can arrange single or many staggered arrangement, can monitor the liquid level between different regions to reach the purpose that reduces step motor stroke range.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIGS. 2-5 are schematic cross-sectional views of different numbers of sensor installations;

fig. 6 is a schematic structural diagram of the sealing interface of the present invention.

In the figure: 1-temperature sensor, 2-heating wire, 3-stay tube, 4-step motor, 5-sealing interface, 500-base, 501-sealing gasket, 502-cutting ferrule, 503-through hole, 6-high temperature and high pressure equipment, 7-insulating heat conduction core, 8-temperature detection module, 9-motor drive module, 10-power regulation module, 11-control system, 12-alarm system, 13-liquid level display and operation module, 14-heat conduction material.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 6 are drawings of the embodiment, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The utility model provides an initiative inspection type liquid level sensing system, as shown in figure 1, including sensing part and demodulation part, the sensing part includes temperature sensor 1, heating wire 2, stay tube 3, insulating heat conduction core 7, step motor 4 and sets up sealing interface 5 on high temperature high-pressure equipment 6. The supporting tube 3 is a metal round tube which is made of a hollow stainless steel tube, a copper tube, a nickel alloy tube or a titanium alloy tube, one end of the metal round tube is sealed, and the other end of the metal round tube is provided with a through hole, the inner wall and the outer wall of the supporting tube 3 are smooth surfaces, the smoothness is high, it is guaranteed that measuring liquid cannot be adhered to the outer wall easily, and the insulating heat conduction core 7 is arranged in the supporting tube 3 easily. The sealing end of the supporting tube 3 extends into the high-temperature high-pressure equipment 6 through the sealing interface 5, the through hole end is positioned outside the high-temperature high-pressure equipment 6, in order to achieve the sealing effect, the sealing interface 5 adopts a bolt structure, as shown in detail in fig. 3, the sealing interface comprises a base 500, a sealing gasket 501 and a clamping sleeve 502, the base 500 is connected to the interface part on the high-temperature high-pressure equipment 6 in a threaded manner, or a through hole can be formed in the high-temperature high-pressure equipment 6 and is directly welded on the high-temperature high-pressure equipment; the middle parts of the base 500, the sealing gasket 501 and the clamping sleeve 502 are correspondingly provided with through holes 503 with the diameter matched with the outer diameter of the support tube 3, the through holes are slightly larger than the outer diameter of the support tube 3, the support tube 3 penetrates into the high-temperature high-pressure equipment 6 from the through holes, the sealing gasket 501 is extruded by screwing the clamping sleeve 502 and the base 500 to realize the sealing and fixing of the support tube 3, and the sealing gasket 501 is processed by adopting annealed red copper, polytetrafluoroethylene or rubber sealing materials. The sealing interface 5 may also be implemented with other existing sealing assemblies.

The utility model provides an active inspection type liquid level sensing system, wherein an insulating heat conducting core 7 in a sensing part is an insulating ceramic rod, the outer diameter of the insulating heat conducting core is matched with the inner diameter of a supporting tube 3, the insulating heat conducting core is made of quartz, corundum or mica, and the insulating heat conducting core is formed by sequentially splicing an integral ceramic rod or a plurality of ceramic blocks; as shown in fig. 2 to 5, the insulating heat conducting core 7 is provided with a heating wire through hole and one or two or more temperature measuring channels arranged around the heating wire through hole; the electric heating wire 2 is a high-temperature-resistant alloy wire selected from any one of high-quality nickel-chromium and iron-chromium-aluminum, the outer diameter of the electric heating wire 2 is tightly matched with an electric heating wire through hole of the insulated heat conducting core, and the electric heating wire 2 is arranged in an electric heating wire channel and is fixed and uniformly conducts heat of the electric heating wire 2 through a heat conducting material 14 filled in the electric heating wire channel; the temperature sensor 1 is an electrical temperature sensor or an optical fiber type temperature sensor, the electrical temperature sensor comprises a thermocouple and a thermal resistor, and the optical fiber type temperature sensor comprises an optical fiber grating and an optical fiber F-P, M-Z; the number of the temperature sensors 1 is one or two or more; the temperature sensor 1 is arranged in the temperature measuring channel. As shown in fig. 1, an insulating heat conducting core 7 provided with a temperature sensor 1 and a heating wire 2 is installed in a support tube 3 from an open end of the support tube 3 until reaching the bottom of a sealed end, and heat is fixed and conducted through a heat conducting material 14 filled in the support tube 3, tail ends of the heating wire 2 and the temperature sensor 1 are both led out from a through hole end of the support tube 3 outside a high-temperature high-voltage device 6, leading-out ends of the heating wire and the temperature sensor are insulated and isolated from the support tube 3, a control end of a stepping motor 4 is connected with the tail end of the temperature sensor 1, the temperature sensor 1 is controlled by the stepping motor 4 to move up and down along the insulating heat conducting core 7, a liquid-gas interface temperature step position is found, and then the current liquid level value is accurately obtained based on an initial. The heat conduction material is made of any one of heat conduction silicone grease, heat conduction silicone oil, boron nitride or magnesium oxide high-temperature-resistant insulating powder. Step motor 4 chooses for use the brushless DC motor or the servo motor of linear displacement, is equipped with temperature sensor connection platform on step motor 4 to be equipped with one or two or more than two temperature sensor sectional fixture on connection platform, and through the tail end centre gripping of temperature sensor 1 that the temperature sensor sectional fixture will correspond, be used for controlling temperature sensor 1 through 9 drive stepper motor 4 of motor driver module and reciprocate, step motor 4's stroke is greater than the fluctuation range of required monitoring liquid level, and step motor 4's stroke and displacement precision can be based on the measuring range and the required design of precision of liquid level. When the temperature sensor 1 is single, the stroke of the stepping motor 4 completely covers the variation range of the liquid level to be monitored and a margin is reserved; when the number of the temperature sensors 1 is two or more, the stroke superposition of each temperature sensor completely covers the variation range of the liquid level to be monitored and a margin is reserved; the temperature measuring range of the temperature sensor 1 is larger than the working temperature ranges of the high-temperature liquid and the heating wire 2 in the high-temperature and high-pressure equipment 6, and the measuring precision is higher than the temperature step value at the liquid-gas interface in the high-temperature and high-pressure equipment 6.

The utility model provides an active inspection type liquid level sensing system, as shown in figure 1, the demodulation part comprises a temperature detection module 8, a motor driving module 9, a power adjusting module 10, a control system 11, an alarm system 12 and a liquid level display and operation module 13, the tail ends of a heating wire 2 and a temperature sensor 1 are both led out from the through hole end of a supporting tube 3 and are insulated and isolated from the supporting tube 3; the power adjusting module 10 is directly connected with the tail end of the electric heating wire 2, the heating power of the electric heating wire 2 is controlled through the power adjusting module 10, the working temperature of the electric heating wire is controlled, and the heat of the electric heating wire is transferred to the supporting tube 3 through the insulating heat conducting core 7; the temperature detection module 8 is connected with the tail end of the temperature sensor 1 through a signal wire and is used for monitoring the temperature of the temperature sensor 1; the motor driving module 9 is connected with the stepping motor 4 and drives the stepping motor 4 to work. The temperature detection module 8, the motor driving module 9, the power regulation module 10, the alarm system 12 and the liquid level display and operation module 13 are all in communication connection with the control system 11 for signal receiving and control, and the control system 11 performs man-machine interaction processing through the liquid level display and operation module 13; and the alarm system 12 receives the liquid level alarm information sent by the control system 11, performs alarm processing, and feeds back the result to the control system 11.

The utility model discloses combine the embodiment to explain the utility model discloses further, the high temperature high-pressure equipment 6 that awaits measuring in the embodiment is small evaporator, and the high pressure water temperature is about 350 ℃, and vapor pressure is 5MPa, and its liquid level measurement scope is 0 ~ 1000 mm. The temperature sensor 1 adopts 1N-type thermocouple, the number of the thermocouples is 1, the temperature measurement range is 0-650 ℃, the measurement precision is +/-0.3%, the response time is less than 50ms, the outer diameter of the temperature sensor is 1.6mm, the length of the measurement section is 1.5m, and the length of the connecting wire is 0.5 m; the heating wire 2 is made of high-quality nichrome wire, the heat-resisting temperature exceeds 1000 ℃, the outer diameter of the heating wire is 3mm, the length of the heating section is 1m, and the length of the connecting wire is 0.5 m; the insulating heat conducting core 7 is formed by assembling 20 double-hole quartz tubes, the outer diameter of each double-hole quartz tube is 6mm, the length of each double-hole quartz tube is 50mm, the length of the whole insulating heat conducting core is 1m, and double holes in the quartz tubes are respectively a 3.2mm electric heating wire through hole and a 1.8mm temperature measuring channel and are used for distributing electric heating wires and a temperature sensor; the heat conducting material 14 is made of magnesium oxide high-temperature-resistant insulating powder; the material of the supporting tube 3 is hard 316L stainless steel, and has the advantages of smooth wall surface, fast heat transfer, corrosion resistance and the like; the outer diameter is 10mm, the inner diameter is 6.2mm, and the length is 1.1 m; a seal head at one end of the supporting tube 3 adopts a cylindrical stainless steel welding plug mode. The base 500 and the cutting sleeve 502 of the sealing interface 5 are made of stainless steel, and the pipe diameter is 30mm in a mode of matching internal and external threads; seal gasket 501 of sealed interface 5 adopts fusiform annealing red copper gasket, and the mounting hole in aperture 14mm is seted up at red copper gasket center, extrudees the seal gasket mounting hole through screwing up cutting ferrule and base, realizes the sealed fixed of stay tube 3.

In the embodiment, the step motor 4 adopts a direct current brushless motor, the step motor 4 is provided with a temperature sensor mounting clamp, the motion track of the clamp is one-dimensional movement, the stroke range is +/-500 mm, the step precision is +/-1 mm, and the movement speed is 0-10 mm/s. The power regulating module 10 adopts a voltage stabilizing transformer, and controls the heating power of the high-temperature resistant heating wire in a voltage regulating mode, so that the working temperature of the heating wire reaches about 500 ℃. The temperature detection module 8 adopts a voltage acquisition module with 4 channels, 16 bit precision and +/-125 mV. The motor driving module 9 selects a driving controller matched with the brushless dc motor. The control system 11 is developed and designed based on a DSP board, and has the functions of controlling the power adjusting module to heat the heating wire to the working temperature, controlling the motor driving module to move the temperature sensor up and down, receiving and processing temperature information of the temperature detecting module, adjusting the moving amount of the stepping motor according to a routing inspection algorithm, sending ultra-low or ultra-high liquid level early warning and normal liquid level measuring information, and performing man-machine interaction. The alarm system 12 is composed of an alarm lamp and a buzzer. The liquid level display and operation module 13 adopts a touch screen control system based on an ARM processor.

When the sensing system in the embodiment works, the temperature sensor 1 and the heating wire 2 are firstly installed in the insulated heat conducting core 7, the support pipe 3 is installed in the high-temperature high-pressure equipment 6 through the sealing interface 5, the support pipe 3 extends into the liquid bottom of the high-temperature high-pressure equipment 6, then the insulated heat conducting core 7 provided with the temperature sensor 1 and the heating wire 2 is inserted into the support pipe 3 from the upper port of the support pipe 3, and the heat conducting material 14 is filled to fix and evenly transfer heat. The tail ends of the temperature sensor 1 and the electric heating wire 2 are led out of the supporting tube 3, the tail end of the temperature sensor 1 is clamped on the stepping motor 4, the temperature sensor 1 is connected with the temperature detection module 8 and used for monitoring the temperature of the temperature sensor 1, the tail end of the electric heating wire 2 is directly connected with the power adjusting module 10, the heating power of the electric heating wire 2 is controlled through the power adjusting module 10, the working temperature of the electric heating wire is controlled, and the heat of the electric heating wire is transferred to the supporting tube 3 through the insulating heat conducting core 7; the motor driving module 9 is connected with the stepping motor 4, the stepping motor 4 is driven by the motor driving module 9 to accurately control the temperature sensor to move up and down, the temperature step position of the liquid-gas interface is found, and then the current liquid level value is accurately obtained based on the initial position of the temperature sensor 2 and the moving amount of the stepping motor 4.

To sum up, the utility model lists an embodiment, nevertheless the utility model discloses not only be limited to above-mentioned embodiment, as long as reach with any same or similar means the technical effect of the utility model, all should belong to the utility model discloses the scope of protection.

Claims

1. The utility model provides an initiative formula liquid level sensing system of patrolling and examining which characterized in that: the device comprises a sensing part and a demodulation part, wherein the sensing part comprises a temperature sensor (1), an electric heating wire (2), a supporting tube (3), an insulating heat conducting core (7), a stepping motor (4) and a sealing interface (5) arranged on high-temperature and high-pressure equipment (6), the supporting tube (3) is a metal round tube with one end sealed and the other end provided with a through hole, the sealing end of the metal round tube extends into the high-temperature and high-pressure equipment through the sealing interface (5), and the through hole end is positioned outside the high-temperature and high-pressure equipment (6); the temperature sensor (1) and the heating wire (2) are both arranged in an insulated heat conducting core (7), the insulated heat conducting core (7) provided with the temperature sensor (1) and the heating wire (2) penetrates into the supporting pipe (3) from top to bottom, and is fixed and conducts heat through a heat conducting material (14) filled in the supporting pipe (3), the tail ends of the heating wire (2) and the temperature sensor (1) are both led out from a through hole end of the supporting pipe (3) arranged outside the high-temperature high-voltage equipment (6), the leading-out end of the heating wire is insulated and isolated from the supporting pipe (3), the control end of the stepping motor (4) is connected with the tail end of the temperature sensor (1), and the stepping motor (4) controls the temperature sensor (1) to move up and down along the insulated heat conducting core (7); the demodulation part comprises a temperature detection module (8), a motor driving module (9), a power regulation module (10) and a control system (11), the power regulation module (10) is connected with the heating wire (2), the temperature detection module (8) is connected with the temperature sensor (1), the motor driving module (9) is connected with the stepping motor (4), and the temperature detection module (8), the motor driving module (9) and the power regulation module (10) are all in communication connection with the control system (11) to receive and control signals.

2. The active inspection type liquid level sensing system according to claim 1, wherein: the demodulation part also comprises an alarm system (12) and a liquid level display and operation module (13) which are in communication connection with the control system (11), and the control system (11) carries out human-computer interaction processing through the liquid level display and operation module (13); and the alarm system (12) receives the liquid level alarm information sent by the control system (11), performs alarm processing, and feeds back the result to the control system (11).

3. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: insulating heat conduction core (7) are insulating ceramic rod, and its external diameter and stay tube (3) internal diameter phase-match, and the material is quartz, corundum or mica, and its structural style is that a holistic ceramic rod or many ceramic blocks splice in proper order and form, has seted up the heating wire through-hole on insulating heat conduction core (7) and has encircleed the temperature measurement passageway of arranging one or two or more around the heating wire through-hole, heating wire (2) are laid in the heating wire passageway to the heat of heating wire (2) is fixed and evenly conducted through heat conduction material (14) of filling in the heating wire passageway, temperature sensor (1) are laid in the temperature measurement passageway.

4. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: step motor (4) select for use the brushless DC motor or the servo motor of linear displacement, be equipped with temperature sensor connection platform on step motor (4) to be equipped with one or two or more than two temperature sensor sectional fixture on connection platform, and through the tail end centre gripping of temperature sensor (1) that temperature sensor sectional fixture will correspond, be used for controlling temperature sensor (1) through motor drive module (9) drive step motor (4) and reciprocate, the stroke of step motor (4) is greater than the fluctuation range of required monitoring liquid level.

5. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: the sealing interface (5) comprises a base (500), a sealing gasket (501) and a clamping sleeve (502), the base (500) is welded or connected to the high-temperature high-pressure equipment (6) in a threaded mode, a through hole (503) with the diameter matched with the outer diameter of the supporting pipe (3) is correspondingly formed in the middle of the base (500), the sealing gasket (501) and the clamping sleeve (502), the supporting pipe (3) penetrates into the high-temperature high-pressure equipment (6) from the through hole and is sealed and fixed by the sealing gasket (501) and the clamping sleeve (502), and the sealing gasket (501) is formed by processing annealing red copper, polytetrafluoroethylene or rubber sealing materials.

6. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: the power adjusting module (10) is directly connected with the tail end of the electric heating wire (2), and the heating power of the electric heating wire (2) is controlled through the power adjusting module (10); the temperature detection module (8) is connected with the tail end of the temperature sensor (1) through a signal line and is used for monitoring the temperature of the temperature sensor (1).

7. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: the heat conduction material is made of any one of heat conduction silicone grease, heat conduction silicone oil, boron nitride or magnesium oxide high-temperature-resistant insulating powder.

8. The active patrol inspection type liquid level sensing system according to claim 1 or 2, wherein: the support tube (3) is made of a hollow stainless steel tube, a copper tube, a nickel alloy tube or a titanium alloy tube, the inner wall and the outer wall of the support tube (3) are smooth, and an insulating heat conduction core (7) provided with a temperature sensor (1) and an electric heating wire (2) is arranged in the support tube (3) from the open end of the support tube (3) until the bottom of the sealing end is reached.

9. The active inspection type liquid level sensing system according to claim 3, wherein: the electric heating wire (2) is a high-temperature-resistant alloy wire selected from any one of high-quality nickel-chromium and iron-chromium-aluminum, the outer diameter of the electric heating wire is tightly matched with the electric heating wire through hole of the insulating heat conduction core, the working temperature of the electric heating wire is controlled by the power adjusting module, and the heat of the electric heating wire is transferred to the supporting tube through the insulating heat conduction core.

10. The active inspection type liquid level sensing system according to claim 3, wherein: the temperature sensor (1) is an electrical temperature sensor or an optical fiber type temperature sensor, the electrical temperature sensor comprises a thermocouple and a thermal resistor, and the optical fiber type temperature sensor comprises an optical fiber grating and an optical fiber F-P, M-Z; the number of the temperature sensors (1) is one or two or more; when the temperature sensor (1) is single, the stroke of the stepping motor (4) completely covers the variation range of the liquid level to be monitored and a margin is reserved; when the number of the temperature sensors (1) is two or more, the stroke superposition of each temperature sensor completely covers the variation range of the liquid level to be monitored and leaves a margin; the temperature measurement range of the temperature sensor (1) is larger than the working temperature ranges of high-temperature liquid and the heating wire (2) in the high-temperature and high-pressure equipment (6), and the measurement precision is higher than the temperature step value at the liquid-gas interface in the high-temperature and high-pressure equipment (6).