Liquid level transmitter and self-cleaning structure thereof

Abstract

The invention discloses a liquid level transmitter and a self-cleaning structure thereof, and relates to the technical field of liquid level transmitters. The detector comprises a detector body, one end of the detector body is symmetrically and fixedly connected with cables, one end of each cable is fixedly connected with a sensor, and one end of each cable is fixedly connected with a flange plate. Through cooperative use of the transmission mechanism, the knocking rod and the annular vibration tuning fork, when a driving motor is started to drive a special-shaped reciprocating wheel to form rolling contact with a contact bead, the knocking rod is driven to deflect in a reciprocating manner around a hinge shaft in cooperation with a reset torsion spring, so that the knocking rod continuously impacts the annular vibration tuning fork to generate high-frequency vibration; meanwhile, the transmission mechanism is utilized to drive and cooperate with the resilience characteristic of the elastic annular airbag sheet to generate reciprocating expansion and contraction deformation, so that the elastic annular airbag sheet crushes large dirt deposited on the surface of the sensor, and high-frequency vibration is matched to enable the dirt deposited on the surface of the sensor to fall off; therefore, dirt deposited on the surface of the sensor can be automatically and quickly cleaned.

Description

Technical Field

[0001] The present application relates to the technical field of liquid level transmitters, and in particular to a liquid level transmitter and a self-cleaning structure thereof. Background Art

[0002] As an important equipment in industrial automation control, liquid level transmitter is widely used in many fields such as petroleum, chemical industry, water conservancy, electricity, etc. Its main function is to convert physical quantity into standard electrical signal output by measuring the pressure or liquid level in the liquid medium, so as to realize remote monitoring and automatic control of liquid storage tanks, pipelines and other equipment. With the continuous development of industrial production, higher and higher requirements are put forward for the accuracy, stability and reliability of liquid level measurement. Therefore, it is particularly important to develop a high-performance, easy-to-maintain liquid level transmitter and its self-cleaning structure.

[0003] Traditional liquid level transmitters mostly determine the height of the liquid level by measuring the static pressure of the liquid. Its working principle is mainly based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. It uses the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert the static pressure into an electrical signal. After temperature compensation and linear correction, this electrical signal is converted into a 4-20mADC standard current signal and output to the control system, thereby achieving accurate measurement and automatic control of the liquid level.

[0004] However, although traditional liquid level transmitters can accurately measure the liquid level, in the long-term use process, due to the various impurities and suspended matter contained in the measured medium, these substances are easy to deposit on the sensor probe, forming a thick layer of dirt. This not only increases the measurement error, but may also cause the sensor probe to be completely blocked, causing the transmitter to lose its measurement function. Summary of the invention

[0005] The purpose of the present application is to solve the problem that various impurities and suspended matter in the measured medium are easily deposited on the sensor probe, forming a thick layer of dirt, thereby increasing the measurement error and may also cause the sensor probe to be completely blocked, causing the transmitter to lose its measurement function. The present application provides a liquid level transmitter and its self-cleaning structure.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A liquid level transmitter comprises a detector body, one end of the detector body is symmetrically fixedly connected with a cable, one end of the cable is fixedly connected with a sensor, and one end of the cable is fixedly connected with a flange.

[0007] By adopting the above technical solution and setting the flange and the sensor for use together, it is convenient to guide the sensor to be fixed on one end of the pipeline to be tested through the flange, and then use the pressure applied by the fluid inside the pipeline to the sensor to test the fluid level, and convert it into an electrical signal through a cable and transmit it to the detector body for analysis, so as to realize real-time monitoring of the fluid level inside the pipeline and improve the practicality of the device.

[0008] A self-cleaning structure for a liquid level transmitter comprises an installation bin provided at the bottom of a flange, an annular vibrating tuning fork is fixedly connected to the interior of the installation bin, one end of the sensor is installed inside the annular vibrating tuning fork, a knocking rod is hingedly connected to the interior of the installation bin, a reset torsion spring is sleeved on the hinged end of the knocking rod, one end of the reset torsion spring is in contact with the flange, and the other end of the reset torsion spring is in contact with the knocking rod, a resistance bead is hingedly connected to the top ball of the knocking rod, a special-shaped reciprocating wheel adapted to the resistance bead is rotatably connected to the interior of the installation bin, a driving motor is fixedly connected to the top of the flange, an output end of the driving motor is fixedly connected to the special-shaped reciprocating wheel, an elastic annular airbag sheet is fixedly connected to the bottom of the flange, the inner side of the elastic annular airbag sheet is fixedly connected to the sensor, and a transmission mechanism for driving the elastic annular airbag sheet to shrink and expand is installed inside the installation bin.

[0009] By adopting the above technical scheme, by setting the transmission mechanism and the coordinated use of the knocking rod and the annular vibrating tuning fork, when the driving motor is started to drive the special-shaped reciprocating wheel to form a rolling conflict with the interference bead, the reset torsion spring drives the knocking rod to reciprocate around the hinge shaft, so that the knocking rod continuously hits the annular vibrating tuning fork to generate high-frequency vibration, and at the same time, the transmission mechanism is used to drive the elastic annular airbag sheet to produce reciprocating expansion and contraction deformation in coordination with the rebound characteristics, so that the elastic annular airbag sheet squeezes the large pieces of dirt deposited on the sensor surface, and cooperates with the high-frequency vibration to make the dirt deposited on the sensor surface fall off, thereby facilitating the automatic and rapid cleaning of the dirt deposited on the sensor surface, effectively reducing the detection error of the device, and improving the detection accuracy of the device.

[0010] Furthermore, the transmission mechanism includes an annular compression plate slidably connected to the inside of the installation bin, an annular slide rail is provided on the inner side of the installation bin, an annular slide rail is rotatably connected to the inside of the annular slide rail, a plurality of resistance rods are evenly arranged at the bottom of the annular slide rail, a ball bearing is ball-hinged at the bottom of the resistance rod, a wave ring platform is fixedly connected to the top of the annular compression plate to form a rolling resistance with the ball bearing, and a transmission assembly for driving the annular slide plate to rotate is installed at one end of the special-shaped reciprocating wheel.

[0011] By adopting the above technical scheme, by setting the transmission component for coordinated use with the ball and the wave ring table, when the driving motor is started to drive the special-shaped reciprocating wheel to rotate, the transmission component drives the annular slide plate to rotate and move along the inner wall of the annular slide rail, and the resistance rod drives the ball to form a rolling resistance with the wave ring table, and at the same time, the wave ring table drives the annular compression plate to move downward along the inner wall of the installation bin, and then the air pressure between the elastic annular airbag sheet and the annular compression plate is used to push the annular compression plate to move upward along the inner wall of the installation bin, so that the elastic deformation characteristics of the elastic annular airbag sheet are reciprocated, so that the elastic annular airbag sheet is affected by the air pressure change between the annular compression plate, and produces reciprocating expansion and contraction deformation, thereby squeezing out large pieces of dirt deposited on the sensor surface, thereby further improving the cleaning effect of the dirt deposited on the sensor surface, and improving the practicality of the device.

[0012] Furthermore, the transmission assembly includes a gear ring fixedly connected to the inner side of the annular slide, and the bottom of the special-shaped reciprocating wheel is fixedly connected to a gear meshing with the gear ring.

[0013] By adopting the above technical solution and setting the coordinated use of the gear ring and the gear, when the driving motor is started to drive the special-shaped reciprocating wheel to rotate, the special-shaped reciprocating wheel drives the gear to engage with the gear ring, and drives the gear ring to drive the annular slide plate to rotate along the inner wall of the annular slide rail, thereby facilitating the driving of the annular slide plate to rotate along the inner wall of the annular slide rail, and effectively improving the practicability of the device.

[0014] Furthermore, a return spring is fixedly connected to the interior of the installation bin, and the top of the return spring is fixedly connected to the annular compression plate.

[0015] By adopting the above technical scheme, by setting the return spring and the annular compression plate for use together, it is convenient to utilize the rebound characteristics of the return spring, so that when the rebound characteristics of the elastic annular airbag sheet are used in combination with the air pressure between the annular compression plate to push the annular compression plate to move upward along the inner wall of the installation bin, the rebound deformation generated by the return spring is used to push the annular compression plate to move rapidly upward along the inner wall of the installation bin, thereby effectively improving the return efficiency of the annular compression plate and further improving the practicability of the device.

[0016] Furthermore, a rubber ring gasket is fixedly connected to the interior of the installation bin, and the rubber ring gasket is installed between the annular vibration tuning fork and the sensor.

[0017] By adopting the above technical solution, by arranging the rubber ring pad and the sensor and the annular vibration tuning fork for use in combination, a flexible resistance is formed between the annular vibration tuning fork and the sensor, thereby effectively reducing the wear between the annular vibration tuning fork and the sensor and extending the service life of the device.

[0018] Furthermore, the inner side and the outer side of the annular compression plate are fixedly connected with sealing rubber rings, and the sealing rubber rings form flexible resistance with the inner wall of the installation chamber and the outer side of the sensor respectively.

[0019] By adopting the above technical solution, by setting the sealing rubber ring to be used in conjunction with the sensor and the installation bin, it is convenient to utilize the elastic characteristics of the sealing rubber ring, so that the annular compression plate drives the sealing rubber ring to fit the sensor and one end of the installation bin to move, thereby effectively improving the sealing effect between the annular compression plate and the sensor and the installation bin.

[0020] Furthermore, the surface of the elastic annular airbag sheet is coated with CTPU elastic waterproof and anti-corrosion coating.

[0021] By adopting the above technical solution and setting the CTPU elastic waterproof and anti-corrosion coating, the corrosion resistance of the surface of the elastic annular airbag sheet is effectively improved, thereby extending the service life of the device.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. By setting up the transmission mechanism and cooperating with the knocking rod and the annular vibrating tuning fork, when the driving motor is started to drive the special-shaped reciprocating wheel to form a rolling conflict with the resistance bead, the reset torsion spring drives the knocking rod to reciprocate around the hinge shaft, so that the knocking rod continuously hits the annular vibrating tuning fork to generate high-frequency vibration. At the same time, the transmission mechanism is used to drive the elastic annular airbag sheet to produce reciprocating expansion and contraction deformation in accordance with its rebound characteristics, so that the elastic annular airbag sheet can squeeze the large pieces of dirt deposited on the sensor surface, and the high-frequency vibration can be used to make the dirt deposited on the sensor surface fall off, so as to realize the automatic and rapid cleaning of the dirt deposited on the sensor surface, effectively reduce the detection error of the device, and improve the detection accuracy of the device.

[0023] 2. By setting up the transmission component for use with the ball and the wave ring table, when the driving motor is started to drive the special-shaped reciprocating wheel to rotate, the transmission component drives the annular slide plate to rotate and move along the inner wall of the annular slide rail, and the resistance rod drives the ball to form a rolling resistance with the wave ring table, and at the same time, the wave ring table drives the annular compression plate to move downward along the inner wall of the installation bin, and then the air pressure between the elastic annular airbag sheet and the annular compression plate is used to push the annular compression plate to move upward along the inner wall of the installation bin. In this way, the elastic deformation characteristics of the elastic annular airbag sheet are reciprocated, so that the elastic annular airbag sheet is affected by the air pressure change between the annular compression plate, and produces reciprocating expansion and contraction deformation, thereby squeezing out large pieces of dirt deposited on the sensor surface, thereby further improving the cleaning effect of the dirt deposited on the sensor surface and improving the practicability of the device.

[0024] 3. By setting up the return spring and the annular compression plate for use, it is convenient to utilize the rebound characteristics of the return spring, so that when the rebound characteristics of the elastic annular airbag sheet are used in conjunction with the air pressure between the annular compression plate to push the annular compression plate to move upward along the inner wall of the installation bin, the rebound deformation generated by the return spring is used to push the annular compression plate to move rapidly upward along the inner wall of the installation bin, thereby effectively improving the return efficiency of the annular compression plate and further improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0026] Figure 2 It is a schematic diagram of the internal structure of the installation bin in this application.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 It is an exploded view of the internal structure of the installation bin in this application.

[0029] Description of reference numerals: 1. Detector body; 2. Cable; 3. Sensor; 4. Flange; 5. Mounting compartment; 6. Annular vibration tuning fork; 7. Knocking rod; 8. Reset torsion spring; 9. Resistance bead; 10. Special-shaped reciprocating wheel; 11. Driving motor; 12. Elastic annular airbag sheet; 13. Annular compression plate; 14. Annular slide rail; 15. Annular slide plate; 16. Resistance rod; 17. Ball; 18. Gear ring; 19. Gear; 20. Reset spring; 21. Rubber ring gasket; 22. Sealing rubber ring; 23. Wave ring table. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiments of the present application disclose a liquid level transmitter and a self-cleaning structure thereof.

[0032] Reference Figure 1 and Figure 2 A liquid level transmitter includes a detector body 1, one end of the detector body 1 is symmetrically fixedly connected to a cable 2, one end of the cable 2 is fixedly connected to a sensor 3, and one end of the cable 2 is fixedly connected to a flange 4.

[0033] When in use, the flange 4 is first manually pulled to fix the connection with the pipeline to be tested, and the flange 4 drives the sensor 3 to directly contact the fluid inside the pipeline. Then, the pressure exerted on the sensor 3 by the fluid inside the pipeline is monitored by the sensor 3, and converted into an electrical signal, which is transmitted to the detector body 1 through the cable 2 for analysis, display and remote control, thereby facilitating real-time monitoring of the fluid level inside the pipeline and improving the practicability of the device.

[0034] Reference Figure 2-Figure 4 , a self-cleaning structure of a liquid level transmitter, comprising an installation bin 5 opened at the bottom of a flange 4, an annular vibration tuning fork 6 is fixedly connected inside the installation bin 5, one end of the sensor 3 is installed inside the annular vibration tuning fork 6, a knocking rod 7 is hinged inside the installation bin 5, a reset torsion spring 8 is sleeved on the hinged end of the knocking rod 7, one end of the reset torsion spring 8 is in conflict with the flange 4, and the other end of the reset torsion spring 8 is in conflict with the knocking rod 7, a top ball of the knocking rod 7 is hinged with a conflicting bead 9, a special-shaped reciprocating wheel 10 adapted to the conflicting bead 9 is rotatably connected inside the installation bin 5, a driving motor 11 is fixedly connected to the top of the flange 4, an output end of the driving motor 11 is fixedly connected to the special-shaped reciprocating wheel 10, an elastic annular airbag sheet 12 is fixedly connected to the bottom of the flange 4, the inner side of the elastic annular airbag sheet 12 is fixedly connected to the sensor 3, and a transmission mechanism for driving the elastic annular airbag sheet 12 to shrink and expand is installed inside the installation bin 5; The transmission mechanism includes an annular compression plate 13 slidably connected to the inside of the installation bin 5, an annular slide rail 14 is provided on the inner side of the installation bin 5, an annular slide rail 14 is rotatably connected to the inside of the annular slide rail 14, a plurality of resistance rods 16 are evenly arranged at the bottom of the annular slide rail 15, a ball 17 is spherically hinged at the bottom of the resistance rod 16, a wave ring 23 is fixedly connected to the top of the annular compression plate 13 to form a rolling resistance with the ball 17, and a transmission component for driving the annular slide rail 15 to rotate is installed at one end of the special-shaped reciprocating wheel 10; Furthermore, the transmission assembly includes a gear ring 18 fixedly connected to the inner side of the annular slide plate 15 , and a gear 19 meshing with the gear ring 18 is fixedly connected to the bottom of the special-shaped reciprocating wheel 10 .

[0035] During use, when dirt is deposited on the surface of the sensor 3, the driving motor 11 is started to drive the special-shaped reciprocating wheel 10 to rotate, so that the special-shaped reciprocating wheel 10 forms a rolling conflict with the resistance bead 9, thereby pushing the resistance bead 9 to drive the knocking rod 7 to rotate around the hinge axis, and at the same time, the knocking rod 7 squeezes the reset torsion spring 8 to produce a contraction deformation, and then the special-shaped characteristics of the special-shaped reciprocating wheel 10 are combined with the rebound characteristics of the reset torsion spring 8 to make the reset torsion spring 8 rebound around the hinge axis to push out one end of the knocking rod 7, and make the other end of the knocking rod 7 collide with the annular vibration tuning fork 6, so that the knocking rod 7 continues to collide with the annular vibration tuning fork 6, and then the annular vibration tuning fork 6 generates high-frequency vibration, and at the same time, the high-frequency vibration generated by the annular vibration tuning fork 6 is transmitted to the sensor 3 through the flange 4, so that the dirt deposited on the surface of the sensor 3 falls off, so as to realize automatic and rapid cleaning of the dirt deposited on the surface of the sensor 3, effectively reduce the detection error of the device, and improve the detection accuracy of the device; When the special-shaped reciprocating wheel 10 is driven to rotate, the special-shaped reciprocating wheel 10 drives the gear 19 to rotate, and the gear 19 is meshed with the gear ring 18, so that the gear ring 18 drives the annular slide 15 to rotate, and the annular slide 15 drives the resistance rod 16 to rotate and move along the guide direction of the annular slide rail 14, and at the same time, the resistance rod 16 drives the ball 17 to form a rolling resistance with the wave ring platform 23, and at the same time, the annular compression plate 13 is pushed to move downward along the inner wall of the installation chamber 5 along the guide direction of the wave ring platform 23, and the annular compression plate 13 squeezes the air between the elastic annular airbag sheet 12, so that the elastic The annular airbag sheet 12 is subjected to force to expand and deform, so that the elastic annular airbag sheet 12 pushes the large pieces of dirt deposited on the surface to break and fall off. Then, the elastic annular airbag sheet 12 is used to shrink and deform by utilizing its rebound characteristics, and push the annular compression plate 13 to move upward along the inner wall of the installation bin 5, while restoring the elastic annular airbag sheet 12 to its flatness. In this reciprocating manner, the elastic annular airbag sheet 12 produces continuous expansion and contraction deformation, thereby improving the cleaning efficiency of the dirt deposited on the surface of the sensor 3.

[0036] Reference Figure 2-Figure 4 A return spring 20 is fixedly connected to the interior of the mounting bin 5 , and the top of the return spring 20 is fixedly connected to the annular compression plate 13 .

[0037] During use, when the annular compression plate 13 is driven to move downward along the inner wall of the mounting bin 5, the annular compression plate 13 pressurizes the return spring 20 to produce a contraction deformation, and then the elastic characteristics of the elastic annular airbag sheet 12 are combined with the air pressure between the annular compression plate 13 to push the annular compression plate 13 to move upward along the inner wall of the mounting bin 5, causing the return spring 20 to produce a rebound deformation and push the annular compression plate 13 to move rapidly upward along the inner wall of the mounting bin 5, thereby effectively improving the return efficiency of the annular compression plate 13 and further improving the practicability of the device.

[0038] Reference Figure 2-Figure 4 A rubber ring gasket 21 is fixedly connected to the interior of the mounting chamber 5 , and the rubber ring gasket 21 is installed between the annular vibration tuning fork 6 and the sensor 3 .

[0039] During use, when the knocking rod 7 is driven to knock the annular vibration tuning fork 6 to generate vibration, the annular vibration tuning fork 6 squeezes the rubber ring pad 21 to cause deformation, and the annular vibration tuning fork 6 forms a flexible contact with the sensor 3 through the rubber ring pad 21, thereby effectively reducing the wear between the annular vibration tuning fork 6 and the sensor 3 and extending the service life of the device.

[0040] Reference Figure 2-Figure 4 The inner side and the outer side of the annular compression plate 13 are fixedly connected with a sealing rubber ring 22 , and the sealing rubber ring 22 forms a flexible contact with the inner wall of the installation chamber 5 and the outer side of the sensor 3 respectively.

[0041] During use, when the annular compression plate 13 is driven to move along the inner wall of the mounting bin 5, the annular compression plate 13 drives the sealing rubber ring 22 to form extrusion between the mounting bin 5 and the sensor 3, and utilizes the elastic deformation of the sealing rubber ring 22 to make the sealing rubber ring 22 fit the inner wall of the mounting bin 5 and the outer side of the sensor 3 and move, thereby effectively improving the sealing effect between the annular compression plate 13 and the sensor 3 and the mounting bin 5.

[0042] Reference Figure 2-Figure 4 The surface of the elastic annular airbag sheet 12 is coated with CTPU elastic waterproof and anti-corrosion coating.

[0043] When in use, by coating the surface of the elastic annular airbag sheet 12 with CTPU elastic waterproof and anti-corrosion coating, when the elastic annular airbag sheet 12 is deformed, the CTPU elastic waterproof and anti-corrosion coating forms a comprehensive wrapping protection for the elastic annular airbag sheet 12, thereby effectively improving the corrosion resistance of the surface of the elastic annular airbag sheet 12 and extending the service life of the device.

[0044] The implementation principle of a liquid level transmitter and its self-cleaning structure in this embodiment is as follows: first, the flange 4 is manually pulled to be fixedly connected to the pipeline to be tested, and the flange 4 drives the sensor 3 to directly contact the fluid inside the pipeline, and then the pressure exerted on the sensor 3 by the fluid inside the pipeline is monitored by the sensor 3, and converted into an electrical signal, which is transmitted to the detector body 1 through the cable 2 for analysis, display and remote control; Then, when dirt is deposited on the surface of the sensor 3, the driving motor 11 is started to drive the special-shaped reciprocating wheel 10 to rotate, so that the special-shaped reciprocating wheel 10 forms a rolling conflict with the resistance bead 9, thereby pushing the resistance bead 9 to drive the knocking rod 7 to rotate around the hinge axis, and at the same time, the knocking rod 7 squeezes the reset torsion spring 8 to produce a contraction deformation, and then the special-shaped characteristics of the special-shaped reciprocating wheel 10 are combined with the rebound characteristics of the reset torsion spring 8, so that the reset torsion spring 8 rebounds around the hinge axis to push out one end of the knocking rod 7, and the other end of the knocking rod 7 collides with the annular vibration tuning fork 6, so that the knocking rod 7 continues to collide with the annular vibration tuning fork 6, and then the annular vibration tuning fork 6 generates high-frequency vibration, and at the same time, the high-frequency vibration generated by the annular vibration tuning fork 6 is transmitted to the sensor 3 through the flange 4, so that the dirt deposited on the surface of the sensor 3 falls off; At the same time, the special-shaped reciprocating wheel 10 drives the gear 19 to mesh with the gear ring 18, so that the gear ring 18 drives the annular slide 15 to rotate, and the annular slide 15 drives the contact rod 16 to drive the ball 17 to form a rolling contact with the wave ring platform 23, and at the same time, the annular compression plate 13 is pushed to move downward along the inner wall of the installation bin 5 along the guiding direction of the wave ring platform 23, and the annular compression plate 13 squeezes the air between the elastic annular airbag sheet 12, so that the elastic annular airbag sheet 12 is forced to expand and deform, and then the elastic annular airbag sheet 12 pushes the large pieces of dirt deposited on the surface to break. The annular airbag sheet 13 is forced to break and fall off, and at the same time, the annular compression plate 13 squeezes the reset spring 20 to produce a contraction deformation. Then, the elastic characteristics of the elastic annular airbag sheet 12 are combined with the air pressure between the annular compression plate 13 to push the annular compression plate 13 to move upward along the inner wall of the installation bin 5, causing the reset spring 20 to rebound and push the annular compression plate 13 to move rapidly upward along the inner wall of the installation bin 5. At the same time, the elastic annular airbag sheet 12 is restored to flatness. In this reciprocating manner, the elastic annular airbag sheet 12 produces a continuous expansion and contraction deformation, so as to improve the cleaning efficiency of the dirt deposited on the surface of the sensor 3.

Claims

1. A liquid level transmitter, comprising a detector body (1), characterized in that: One end of the detector body (1) is symmetrically fixedly connected to a cable (2), one end of the cable (2) is fixedly connected to a sensor (3), and one end of the cable (2) is fixedly connected to a flange (4).

2. A liquid level transmitter self-cleaning structure, applicable to a liquid level transmitter as claimed in claim 1, comprising a mounting chamber (5) opened at the bottom of a flange (4), characterized in that: An annular vibration tuning fork (6) is fixedly connected to the interior of the mounting chamber (5), one end of the sensor (3) is mounted inside the annular vibration tuning fork (6), a knocking rod (7) is hingedly connected to the interior of the mounting chamber (5), a hinged end sleeve of the knocking rod (7) is provided with a reset torsion spring (8), one end of the reset torsion spring (8) is in contact with the flange (4), and the other end of the reset torsion spring (8) is in contact with the knocking rod (7), a top ball of the knocking rod (7) is hingedly connected with a resisting bead (9), and the mounting chamber (5) A special-shaped reciprocating wheel (10) adapted to the abutment bead (9) is rotatably connected inside the flange (4), a driving motor (11) is fixedly connected to the top of the flange (4), an output end of the driving motor (11) is fixedly connected to the special-shaped reciprocating wheel (10), an elastic annular airbag sheet (12) is fixedly connected to the bottom of the flange (4), the inner side of the elastic annular airbag sheet (12) is fixedly connected to the sensor (3), and a transmission mechanism for driving the elastic annular airbag sheet (12) to shrink and expand is installed inside the installation bin (5).

3. The self-cleaning structure of a liquid level transmitter according to claim 2, characterized in that: The transmission mechanism comprises an annular compression plate (13) slidably connected to the inside of the installation bin (5); an annular slide rail (14) is provided on the inner side of the installation bin (5); an annular slide rail (14) is rotatably connected to the inside of the annular slide rail (14); a plurality of abutment rods (16) are evenly arranged at the bottom of the annular slide rail (15); a ball bearing (17) is spherically hinged at the bottom of the abutment rod (16); a wave ring platform (23) is fixedly connected to the top of the annular compression plate (13) to form rolling abutment with the ball bearing (17); and a transmission assembly for driving the annular slide rail (15) to rotate is installed at one end of the special-shaped reciprocating wheel (10).

4. The self-cleaning structure of a liquid level transmitter according to claim 3 is characterized in that: The transmission assembly comprises a toothed ring (18) fixedly connected to the inner side of the annular slide plate (15), and a gear (19) meshing with the toothed ring (18) is fixedly connected to the bottom of the special-shaped reciprocating wheel (10).

5. The self-cleaning structure of a liquid level transmitter according to claim 2, characterized in that: A return spring (20) is fixedly connected inside the installation bin (5), and the top of the return spring (20) is fixedly connected to the annular compression plate (13).

6. The self-cleaning structure of a liquid level transmitter according to claim 2, characterized in that: A rubber ring gasket (21) is fixedly connected to the interior of the installation bin (5), and the rubber ring gasket (21) is installed between the annular vibration tuning fork (6) and the sensor (3).

7. The self-cleaning structure of a liquid level transmitter according to claim 2, characterized in that: The inner side and the outer side of the annular compression plate (13) are both fixedly connected with a sealing rubber ring (22), and the sealing rubber ring (22) forms a flexible contact with the inner wall of the installation chamber (5) and the outer side of the sensor (3) respectively.

8. The self-cleaning structure of a liquid level transmitter according to claim 2, characterized in that: The surface of the elastic annular airbag sheet (12) is coated with CTPU elastic waterproof and anti-corrosion coating.

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