CN115993165A - Liquid level detector and use method thereof - Google Patents

Abstract

The invention is applicable to the technical field of liquid level detectors, and provides a liquid level detector and a use method thereof. This liquid level detector, through setting up ceramic protecting crust, can place the induction electrode in ceramic protecting crust, put into the container with the inductor during the use, can immerse liquid afterwards for liquid soaks the inductor, induction electrode accessible ceramic protecting crust carries out real-time measurement and liquid level detection to liquid, reducible heat is to the influence of induction electrode, make the induction electrode in the inductor can not cause the measurement to influence along with the problem of liquid level, the inductor can be used in humidifier, mopping machine, water purifier, coffee machine, water dispenser, water heater or autoloading production line, make this liquid level detector application scope increase, and can not be because the data of high temperature and corrosivity influence measurement of liquid.

Description

Liquid level detector and use method thereof

Technical Field

The invention belongs to the technical field of liquid level detectors, and particularly relates to a liquid level detector and a use method thereof.

Background

The liquid level, i.e. the position of the interface between the measuring gas and the liquid, is generally determined by taking the bottom surface of the device or the container as or a reference point, i.e. the liquid level, and the purpose of detecting the liquid level is to measure the amount of the substance and monitor or control the continuous production process so as to ensure that the production is safe, economical and smooth, so that the detection of the liquid level is very important.

The principle of the current level detection is that when the device is inserted into the conductive liquid in the container, assuming that the dielectric constant of the intermediate medium is epsilon 3 and the immersed length of the electrode is I, the capacitance of the capacitor is represented by R and R, wherein R and R are the outer radius of the insulating cover layer and the outer radius of the inner electrode respectively, and epsilon 3 is constant, C is proportional to epsilon.2, if a part of the electrode is immersed by the liquid (non-conductive) with dielectric constant epsilon.2, the increment delta C of the capacitance is generated (epsilon.2 > epsilon.1), the capacitance between the two electrodes C=C1+delta C, if the immersed length of the electrode is I, the increment C=C1+delta C, and if the immersed length of the electrode is I, the increment delta C is proportional to the length of the electrode, when epsilon.2, epsilon.1 and R, R are unchanged, the increment delta C is proportional to the capacitance, and the level height is known by measuring the increment delta C.

The existing liquid level detector generally adopts a capacitive liquid level detector, when in use, liquid is required to be immersed for measurement, and the liquid level is calculated by the change of the capacitance or admittance of a detection rod caused by the change of the liquid height, but when the liquid level detector is applied to a sealed container, the detector is easily damaged along with the increase of the pressure in the container or the self-gathering, corrosion function and high-viscosity liquid, so that the numerical deviation detected by the detector is larger, the normal use of the detector is influenced, and the liquid level detector needing the capacitance detection has a smaller application range.

Disclosure of Invention

The invention provides a liquid level detector and a use method thereof, and aims to solve the problems that when the liquid level detector is applied to a sealed container, the detector is easily damaged, the detected value deviation of the detector is larger, and the normal use of the detector is influenced as the pressure in the container increases or the liquid has self-aggregation and corrosion functions and high-viscosity liquid.

The invention is realized in this way, a liquid level detector and a use method thereof, comprising a protection box and a division plate arranged in the inner cavity of the protection box for dividing, wherein the division plate divides the inner cavity of the protection box into a heat dissipation cavity and two protection cavities; the processor is arranged in the heat dissipation cavity and used for processing data, and the protection box is provided with a signal interface electrically connected with the processor; the jack is arranged on the top of the protection cavity and is electrically connected with the processor, the sliding plate is arranged at the bottom of the protection cavity and is used for sliding, the sealing plate is fixedly arranged on the sliding plate, and the movable hole for the sealing plate to move is formed in the separating plate; the protection box is provided with four heat dissipation holes for heat dissipation, and the four heat dissipation holes are provided with filter screens arranged in the heat dissipation holes; a transmission line is arranged in the protection cavity at the top, one end of the transmission line is electrically connected with the jack, and an inductor is arranged at the other end of the transmission line; the sensor comprises a ceramic protective shell for protection, a sealing seat arranged at the top of the ceramic protective shell for installation, and an induction electrode for detection arranged at the bottom of the sealing seat.

Preferably, a sealing groove is arranged on the ceramic protective shell, and a sealing ring for sealing is arranged at the bottom of the sealing seat and positioned on the outer ring of the induction electrode.

Preferably, a sealing ring for sealing is arranged in the movable hole, the inner ring surface of the sealing ring is in contact with the surface of the sealing plate, and a clamping groove matched with the sealing plate is formed in the protection cavity at the top.

Preferably, the protection box is internally provided with a telescopic cavity at one side of the radiating hole, a moving plate which is arranged in the telescopic cavity and used for sliding is arranged in the telescopic cavity, and a second supporting spring is telescopically and transversely arranged between one side of the moving plate and the inner wall surface of the telescopic cavity.

Preferably, the movable plate extending into the heat dissipation hole is fixedly arranged on the other side of the movable plate, a plurality of ventilation holes are formed in the movable plate at intervals along the length direction of the movable plate, and cleaning brushes are arranged on the inner wall surface of the movable plate and on one side of the ventilation holes.

Preferably, the partition plate is made of heat-insulating material.

Preferably, a first supporting spring is vertically arranged between the bottom of the sliding plate and the inner wall of the protection cavity at the bottom in a telescopic mode.

Preferably, the signal interface model on the protection box comprises RS232 and RS485.

A liquid level detector and a use method thereof comprise the following operation steps:

s1, connecting a power supply, and inserting one end of the transmission line into the jack;

s2, sticking the sensor at the other end of the transmission line on the inner wall of the detection container through an adhesive tape;

s3, connecting the liquid level detector with an external temperature sensor through an interface, and then connecting the liquid level detector with a display screen;

s4, pouring liquid into the container, so that the liquid soaks the inductor, and the induction electrode in the inductor senses;

s5, the sensing electrode transmits data to the processor through the transmission line after sensing, and then the processor processes the data;

s6, the processor combines and synchronously processes the data collected by the temperature sensor and the data sensed by the sensor soaked in the container;

and S7, the processor transmits the processed data to a display screen for display through a signal interface.

Preferably, in S2, the sensor is vertically attached to the inner wall of the container, and then the sensor is immersed in the liquid, so that the sensor can perform liquid level sensing.

Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the liquid level detector disclosed by the invention, the induction electrode can be placed in the ceramic protective shell, the sealing seat is attached to the top of the ceramic protective shell to seal the ceramic protective shell, the inductor is placed in the container when the liquid level detector is used, then the liquid can be immersed in the liquid, so that the inductor is immersed in the liquid, the induction electrode can conduct real-time measurement and liquid level detection on the liquid through the ceramic protective shell, the inductor has a corrosion resistance effect through the ceramic design of the ceramic protective shell, the inductor cannot be corroded by the liquid when the liquid is corroded or immersed in the liquid for a long time, the ceramic protective shell has a heat insulation effect, the ceramic protective shell has lower heat transfer property, the influence of heat on the induction electrode can be reduced, the induction electrode in the inductor cannot cause measurement influence along with the liquid level problem, the inductor can be applied to a humidifier, a floor-mopping machine, a water purifier, a coffee machine, a water heater or an automatic feeding production line, the liquid level detector is enabled to be applicable to be enlarged, and the measured data accuracy cannot be increased due to the high temperature and corrosion influence of the liquid is avoided.

(2) According to the liquid level detector, the partition plate is arranged, so that the partition plate can protect the insertion hole, when one end of the transmission line is required to be inserted into the inner cavity of the top protection cavity, the sliding plate is slid downwards, the sliding plate extrudes the first supporting spring, the first supporting spring is contracted and simultaneously has elastic force, the sliding plate drives the sealing plate to release the blocking of the top protection cavity, the transmission line is inserted into the inner cavity of the top protection cavity and connected with the insertion hole, the problem that dust or foreign matters enter the inner part of the top protection cavity to block the insertion hole when the transmission line is not used, normal use of the insertion hole is affected, and the protection performance of the device is improved.

(3) According to the liquid level detector, the filter screen in the heat dissipation holes is used for generating temperature when the processor works, air can enter the inner cavity of the heat dissipation cavity through the heat dissipation holes to dissipate heat of the processor, when air passes through the filter screen in the heat dissipation holes, the filter screen can filter dust in the air to prevent the dust from entering the inner cavity of the heat dissipation cavity, when the surface of the filter screen is blocked due to excessive dust, the movable plate can slide, so that the movable plate drives the brush on the inner side of the movable plate to clean the outer wall of the filter screen, and the problem that the filter screen is blocked and cannot be ventilated normally due to the fact that the dust is adsorbed on the outer wall of the filter screen is avoided.

Drawings

FIG. 1 is a schematic top view of a structure of the present invention;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;

FIG. 3 is an enlarged schematic view of the structure of FIG. 1B according to the present invention;

FIG. 4 is a schematic cross-sectional elevation view of the structure of the inductor of the present invention;

FIG. 5 is a schematic top view of the structure of the present invention;

FIG. 6 is a schematic diagram of a system according to the present invention;

FIG. 7 is a schematic diagram of a system flow of the present invention;

FIG. 8 is a graph of experimental data of the present invention.

In the figure: 1. a protective case; 2. a heat dissipation cavity; 3. a protective cavity; 4. a first support spring; 5. a processor; 6. a partition plate; 7. a jack; 8. a heat radiation hole; 9. a filter screen; 10. a movable plate; 11. a telescopic chamber; 12. a moving plate; 13. a second support spring; 14. a transmission line; 15. a sealing plate; 16. a sliding plate; 17. a seal ring; 18. a movable hole; 19. ventilation holes; 20. a clamping groove; 21. an inductor; 211. a ceramic protective shell; 212. a seal ring; 213. a sealing seat; 214. and an induction electrode.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1-5, the present invention provides a liquid level detector and a technical scheme of a using method thereof: a liquid level detector and a use method thereof comprise a protection box 1, a partition plate 6 arranged in an inner cavity of the protection box 1 and used for separating, and the partition plate 6 divides the inner cavity of the protection box 1 into a heat dissipation cavity 2 and two protection cavities 3.

The division board 6 is T shape setting, and division board 6 can separate the inner chamber of protection box 1 for the inner chamber in heat dissipation chamber 2 is installed to treater 5, installs the jack 7 that is connected with treater 5 electricity at the inner chamber in top protection chamber 3, and when this equipment was used, the inside in top protection chamber 3 was inserted to the one end with transmission line 14 and the inside of jack 7 can be so that electrically connected between inductor 21 and the treater 5.

The processor 5 is arranged in the heat dissipation cavity 2 and used for processing data, and the protection box 1 is provided with a signal interface electrically connected with the processor 5.

Through the signal interface, the device can be additionally connected with a temperature sensor and display equipment, so that the device can be electrified for use.

The jack 7 is arranged on the top protection cavity 3 and is electrically connected with the processor 5, the sliding plate 16 is arranged in the bottom protection cavity 3 and is used for sliding, the sealing plate 15 is fixedly arranged on the sliding plate 16, and the movable hole 18 for the sealing plate 15 to move is formed in the separation plate 6; the heat dissipation holes 8 are arranged on the protection box 1 and used for heat dissipation, the heat dissipation holes 8 are provided with four filter screens 9 arranged in the heat dissipation holes 8.

Through the setting of four louvres 8 for gaseous accessible single filter screen 9 gets into the inner chamber of heat dissipation chamber 2, and the rethread another louvre 8 is got rid of, can produce heat when processor 5 during operation, and the heat that processor 5 produced can be taken away to the gaseous that circulates in heat dissipation chamber 2 inner chamber, thereby makes processor 5 cool down.

When the processor 5 generates temperature during operation, air can enter the inner cavity of the heat dissipation cavity 2 through the heat dissipation holes 8 to dissipate heat of the processor 5, and when air passes through the filter screen 9 in the heat dissipation holes 8, the filter screen 9 can filter dust of the air to prevent the dust from entering the inner cavity of the heat dissipation cavity 2.

A transmission line 14 is arranged in the top protection cavity 3, and a plug electrically connected with the jack 7 is arranged at one end of the transmission line 14.

The processor 5 comprises a signal transmitting module and a signal receiving module for receiving and transmitting signals.

When the sensor 21 is placed in the container and then the container is filled with liquid, the sensor 21 can transmit the detection data to the processor 5 through the transmission line 14, so that the processor 5 analyzes the data and displays the data through a display device connected with the signal interface.

The inductor 21 comprises a ceramic protective shell 211 for protection, a sealing seat 213 arranged at the top of the ceramic protective shell 211 for installation, and an induction electrode 214 for detection arranged at the bottom of the sealing seat 213.

The ceramic protective shell 211 can be used in high temperature and corrosion resistant environments such as electric water heaters.

In this embodiment, through the ceramic protecting shell 211 in the inductor 21, the induction electrode 214 can be placed in the ceramic protecting shell 211 by arranging the ceramic protecting shell 211, then the sealing seat 213 is attached to the top of the ceramic protecting shell 211 for sealing, when in use, the inductor 21 is placed in a container, and then the container can be immersed in liquid, so that the inductor 21 is immersed in the liquid, and the induction electrode 214 can perform real-time measurement and liquid level detection on the liquid through the ceramic protecting shell 211.

Through the ceramic design of ceramic protecting shell 211 for inductor 21 has corrosion-resistant effect, in corroding liquid or when soaking in liquid for a long time, also can not receive liquid corrosion and lead to damaging, and the ceramic setting of ceramic protecting shell 211 has thermal-insulated effect, when the temperature in the liquid risees, the heat transfer nature of ceramic protecting shell 211 is lower, reducible heat can reduce the influence of heat to sensing electrode 214, make the sensing electrode 214 in inductor 21 can not cause the measurement to influence along with the problem of liquid level, inductor 21 can be applied in humidifier, mopping machine, water purifier, coffee machine, water dispenser, water heater or autoloading production line, make this liquid level detector application scope increase, and can not be because the data of the high temperature and corrosiveness influence measurement of liquid, increase the precision of measurement.

The sensor 21 has different ways due to the different media to be measured:

1. when the coaxial simple capacitor is used for thinner non-conductive liquid (such as light oil and the like), the ceramic protective shell 211 is coaxially sleeved outside the induction electrode 214 and covered with a metal shielding layer, and the metal shielding layer is mutually insulated and fixed, so that the measured medium is an intermediate insulating substance to form the coaxial simple capacitor.

2. The capacitor level sensor for measuring conductive liquid is characterized in that a container and the liquid are used as one electrode of the capacitor, an inserted metal electrode is used as the other electrode, an insulating sleeve is used as an intermediate medium, and the capacitor, the container and the liquid form a cylindrical capacitor.

3. When measuring the level of powdery non-conductive solid and the level of viscous non-conductive liquid, a metal electrode can be directly inserted into the center of a cylindrical container, the instrument ground wire is connected with the container, the container is used as an external electrode, and the material or liquid is used as an insulating medium to form the cylindrical capacitor.

The device may select the appropriate sensing electrode 214 based on the actual situation in the field, i.e. the nature of the medium to be tested (conductive properties, viscosity), the type of container (regular/irregular canister, regular/irregular non-canister).

Further, a sealing groove is arranged on the ceramic protective shell 211, and a sealing ring 212 for sealing is arranged at the bottom of the sealing seat 213 and on the outer ring of the induction electrode 214.

In this embodiment, the ceramic protecting shell 211 is a sleeve with an open top, the material of the ceramic protecting shell 211 is high-temperature resistant and corrosion resistant, can be soaked in liquid for a long time, can resist liquid heating, when the ceramic protecting shell 211 has good corrosion resistance when being in contact with corrosive liquid, and the sealing ring 212 is used for sealing the surface of the top of the ceramic protecting shell 211 when the sealing seat 213 drives the induction electrode 214 to be inserted into the ceramic protecting shell 211, and then the sealing seat 213 and the ceramic protecting shell 211 are fixed.

Further, a sealing ring 17 for sealing is arranged in the movable hole 18, an inner ring surface of the sealing ring 17 is in contact with the surface of the sealing plate 15, and a clamping groove 20 matched with the sealing plate 15 is arranged in the top protection cavity 3.

The sealing ring 17 is made of elastic rubber, so that when the sealing plate 15 moves in the inner cavity of the movable hole 18, the sealing ring 17 can generate elasticity and closely contact with the surface of the sealing plate 15, and a gap between the movable hole 18 and the sealing plate 15 is filled and sealed by the sealing ring 17.

In this embodiment, through the sealing ring 17, when the sliding plate 16 drives the sealing plate 15 to move in the inner cavity of the movable hole 18, the sealing ring 17 can be closely attached to the sealing plate 15, so that dust is prevented from entering the bottom protection cavity 3 through the inside of the bottom protection cavity 3, and then the dust enters the top protection cavity 3 through the gap between the movable hole 18 and the sealing plate 15 to affect the jack 7.

Further, the protection box 1 is internally provided with a telescopic cavity 11 at one side of the radiating hole 8, a moving plate 12 which is arranged in the telescopic cavity 11 and used for sliding is arranged, a second supporting spring 13 is telescopically and transversely arranged between one side of the moving plate 12 and the inner wall surface of the telescopic cavity 11, a movable plate 10 which extends into the radiating hole 8 is fixedly arranged at the other side of the moving plate 12, a plurality of ventilation holes 19 are formed in the movable plate 10 at intervals along the length direction of the movable plate 10 in a penetrating manner, and cleaning brushes are arranged on the inner wall surface of the movable plate 10 and one side of the ventilation holes 19.

Through the ventilation holes 19, when the movable plate 10 is unfolded, gas can pass through the movable plate 10 through the ventilation holes 19, so that the movable plate 10 is prevented from blocking the heat dissipation holes 8, and the gas cannot enter through the movable plate 10

In this embodiment, through the second supporting spring 13 in the inner cavity of the telescopic cavity 11, when the dust on the surface of the filter screen 9 is more, the moving plate 12 is slid, so that the moving plate 12 can drive the movable plate 10 to move, the movable plate 10 drives the cleaning brush to clean the filter screen 9, and through the air holes 19 formed in the movable plate 10, when the movable plate 10 is unfolded, the air can pass through the movable plate 10 through the air holes 19 to enter the filter screen 9 for filtering, so that dust-free air enters the inner cavity of the heat dissipation cavity 2 for dissipating heat of the processor 5.

Further, the partition plate 6 is made of a heat insulating material.

In the present embodiment, the heat insulating material of the partition plate 6 prevents the heat generated by the insertion hole 7 and the processor 5 from being mutually propagated.

Further, a first supporting spring 4 is vertically arranged between the bottom of the sliding plate 16 and the inner wall of the bottom protection cavity 3 in a telescopic manner.

In this embodiment, when the sliding plate 16 is pressed down, the first supporting spring 4 can be stressed to shrink and generate elastic force, and the sliding plate 16 drives the sealing plate 15 to move down, so that the sliding plate 16 releases the blocking of the top protection cavity 3, and one end of the transmission line 14 can enter the inner cavity of the top protection cavity 3 and be inserted into the jack 7 for electrical connection.

Further, the signal interface model on the protection box 1 comprises RS232 and RS485.

In this embodiment, the protection box 1 is provided with a plurality of signal interfaces electrically connected to the processor 5, so that the protection box 1 can be connected to a display screen for display operation.

Referring to fig. 6-8, a liquid level detector and a method for using the same include the following steps:

s1, connecting a power supply, and inserting one end of a transmission line 14 into the jack 7;

s2, sticking the sensor 21 at the other end of the transmission line 14 on the inner wall of the detection container through an adhesive tape;

s3, connecting the liquid level detector with an external temperature sensor through an interface, and then connecting the liquid level detector with a display screen;

s4, pouring liquid into the container, so that the liquid soaks the sensor 21, and the sensing electrode 214 in the sensor 21 senses;

s5, the sensing electrode 214 transmits data to the processor 5 through the transmission line 14 after sensing, and then the processor 5 processes the data;

s6, the processor 5 combines and synchronizes the data collected by the temperature sensor with the data sensed by the sensor 21 soaked in the container;

and S7, the processor 5 transmits the processed data to a display screen for display through a signal interface.

In the present embodiment, in step S2, the inductor 21 may be mounted in a closed container or may be placed in an open container.

When the liquid is poured into the container, assuming that the dielectric constant of the intermediate medium is epsilon 3 and the immersed length of the electrode is I, the capacitance between the electrodes is represented by R and R, wherein R and R are the outer radius of the insulating cover layer and the outer radius of the inner electrode respectively, C is proportional to epsilon 3, if a part of the electrode is immersed by the liquid (non-conductive) with the dielectric constant epsilon 2, the increment delta C of the capacitance is generated (as epsilon 2> epsilon 1), the capacitance between the electrodes is represented by C=C1+delta C, if the immersed length of the electrode is represented by epsilon 1), and the capacitance between the electrodes is represented by C=C1+delta C, if the immersed length of the electrode is represented by I, the increment delta C of the capacitance is proportional to the immersed length of the electrode when epsilon 2, epsilon 1 and R, R are unchanged, and the liquid level height can be known by measuring the value of the increment of the capacitance.

Actual measurement data table of the device.

Further, in S2, the sensor 21 is vertically attached to the inner wall of the container, and then the sensor 21 can perform liquid level sensing by immersing the sensor 21 in the liquid.

In this embodiment, the sensor 21 has the ceramic protective shell 211, is safe and corrosion-resistant, and is immersed in liquid during use, so as to measure the liquid volume and the liquid level in real time, thereby effectively avoiding the damage to the detector caused by larger deviation of the value detected by the detector when the pressure in the container increases or the liquid has self-aggregation and corrosion functions and high-viscosity liquid, and affecting the normal use of the detector.

The working principle and the using flow of the invention are as follows: after the invention is installed, the device is connected with a power supply, a display and a temperature sensor, then the sensor 21 is placed in a container, the sliding plate 16 is slid down, the sealing plate 15 is used for unblocking the top protection cavity 3, one end of the transmission line 14 is inserted into the jack 7 for connection, then the sensor 21 is immersed in the liquid by pouring the liquid into the container, the liquid amount and the liquid level are measured in real time, then the sensing electrode 214 is used for transmitting the sensed data into the processor 5 through the transmission line 14, and the display is used for displaying after the data transmitted by the processor 5 combined with the temperature sensor are combined.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. A liquid level detector, characterized in that: the heat radiation type heat radiation device comprises a protection box (1), and a partition plate (6) arranged in an inner cavity of the protection box (1) and used for separating, wherein the partition plate (6) divides the inner cavity of the protection box (1) into a heat radiation cavity (2) and two protection cavities (3);

a processor (5) arranged in the heat dissipation cavity (2) and used for processing data, and a signal interface electrically connected with the processor (5) is arranged on the protection box (1);

the jack (7) is arranged on the top of the protection cavity (3) and is used for being electrically connected with the processor (5), the sliding plate (16) is arranged at the bottom of the protection cavity (3) and is used for sliding, the sealing plate (15) is fixedly arranged on the sliding plate (16), and the movable hole (18) for the sealing plate (15) to move is formed in the separation plate (6);

the protection box (1) is provided with four heat dissipation holes (8) for heat dissipation, and the four heat dissipation holes (8) are provided with filter screens (9) arranged in the heat dissipation holes (8);

a transmission line (14) is arranged in the protection cavity (3) at the top, one end of the transmission line (14) is electrically connected with the jack (7), and an inductor (21) is arranged at the other end of the transmission line (14);

the sensor (21) comprises a ceramic protective shell (211) for protection, a sealing seat (213) arranged at the top of the ceramic protective shell (211) for installation, and an induction electrode (214) for detection is arranged at the bottom of the sealing seat (213).

2. A fluid level gauge as defined in claim 1, wherein: the ceramic protective shell (211) is provided with a sealing groove, and a sealing ring (212) for sealing is arranged at the bottom of the sealing seat (213) and positioned on the outer ring of the induction electrode (214).

3. A fluid level gauge as defined in claim 1, wherein: the inside of movable hole (18) is equipped with sealing washer (17) that are used for sealing, the interior ring face of sealing washer (17) with the surface of closing plate (15) contacts, the top the inside of protection chamber (3) be equipped with draw-in groove (20) of closing plate (15) looks adaptation.

4. A fluid level gauge as defined in claim 1, wherein: the protection box (1) is internally provided with a telescopic cavity (11) at one side of the radiating hole (8), a moving plate (12) which is arranged in the telescopic cavity (11) and used for sliding is arranged, and a second supporting spring (13) is telescopically and transversely arranged between one side of the moving plate (12) and the inner wall surface of the telescopic cavity (11).

5. A fluid level gauge as defined in claim 4, wherein: the movable plate (10) extending into the radiating hole (8) is fixedly arranged on the other side of the movable plate (12), a plurality of ventilation holes (19) are formed in the movable plate (10) at intervals along the length direction of the movable plate (10), and cleaning brushes are arranged on the inner wall surface of the movable plate (10) and located on one side of the ventilation holes (19).

6. A fluid level gauge as defined in claim 1, wherein: the partition plate (6) is made of heat insulation materials.

7. A fluid level gauge as defined in claim 1, wherein: a first supporting spring (4) is vertically arranged between the bottom of the sliding plate (16) and the inner wall of the protection cavity (3) at the bottom in a telescopic mode.

8. A fluid level gauge as defined in claim 1, wherein: the signal interface model on the protection box (1) comprises RS232 and RS485.

9. The method of using a liquid level detector as claimed in claim 1, wherein: s1, connecting a power supply, and inserting one end of the transmission line (14) into the jack (7);

s2, sticking an inductor (21) at the other end of the transmission line (14) on the inner wall of the detection container through an adhesive tape;

s3, connecting the liquid level detector with an external temperature sensor through an interface, and then connecting the liquid level detector with a display screen;

s4, pouring liquid into the container, so that the liquid soaks the sensor (21), and the sensing electrode (214) in the sensor (21) senses;

s5, the sensing electrode (214) transmits data to the processor (5) through the transmission line (14) after sensing, and then the processor (5) processes the data;

s6, the processor (5) performs combination synchronization processing on data collected by the temperature sensor and data sensed by the sensor (21) soaked in the container;

and S7, the processor (5) transmits the processed data to a display screen for display through a signal interface.

10. A fluid level gauge and method of use as defined in claim 1, wherein: in S2, the inductor (21) is vertically attached to the inner wall of the container, and then the inductor (21) can perform liquid level sensing through soaking of liquid into the inductor (21).

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