Liquid level measuring device

Abstract

The utility model provides a liquid level measuring device which comprises a liquid level meter, a connecting flange, a container and a purging unit, and the liquid level meter is communicated with the container through the connecting flange. The connecting flange comprises an upper connecting flange and a lower connecting flange, the lower connecting flange is connected with the top of the container, a supporting cylinder is arranged between the upper connecting flange and the lower connecting flange, the bottom of the liquid level meter is connected with the upper connecting flange through a liquid level meter flange, and the upper connecting flange is connected with the lower connecting flange through a bolt; and a probe of the liquid level meter extends into the supporting cylinder. The purging unit comprises a purging gas storage tank, a purging gas input pipe, a purging gas ring pipe and spray heads, the two ends of the purging gas input pipe are connected with the purging gas storage tank and the purging gas ring pipe respectively, the purging gas ring pipe is connected with the inner wall of the supporting cylinder, the spray heads are communicated with the purging gas ring pipe in the circumferential direction at equal intervals, and the spray heads all face the liquid level meter probe. According to the invention, accurate measurement of the liquid level is realized.

Description

Technical Field

[0001] The present application relates to the technical field of measuring equipment, and in particular to a liquid level measuring device. Background Art

[0002] In the boiler feed water system, water needs to be stored in a water tank first, and then the water in the water tank is transported to the boiler for water replenishment to ensure that the boiler water level remains at a certain height and maintain the stable operation of the boiler. The water tank refers to a clean water tank, a fresh water tank, and a demineralized water tank. During operation, it is necessary to set a liquid level gauge in the clean water tank, the fresh water tank, and the demineralized water tank to detect the liquid level in the water tank in real time to keep the boiler running continuously. Among them, there are many types of liquid level gauges to choose from, and in the prior art, radar level gauges are mostly used to detect the liquid level. The radar level gauge is a non-contact liquid level gauge, a measuring instrument based on the time travel principle. The radar wave runs at the speed of light, and the running time can be converted into a level signal through electronic components. The probe emits a high-frequency pulse that propagates at the speed of light in space. When the pulse encounters the surface of the material, it is reflected back and received by the receiver in the instrument, and the distance signal is converted into a level signal.

[0003] During use, since water evaporates easily or there is steam, condensation will quickly form on the radar probe. During normal operation, liquid level measurement jumps often occur, affecting the measurement accuracy of the liquid level and having a great impact on the operation and monitoring of the operating personnel. Utility Model Content

[0004] The present application provides a liquid level measuring device to solve the above-mentioned problems mentioned in the background technology.

[0005] The present application provides a liquid level measuring device, comprising: a liquid level meter, a connecting flange, a container and a purge unit, wherein the liquid level meter is connected to the container via the connecting flange.

[0006] The connecting flange includes an upper connecting flange and a lower connecting flange, the lower connecting flange is connected to the top of the container, a supporting tube is arranged between the upper connecting flange and the lower connecting flange, the bottom of the liquid level meter is connected to the upper connecting flange via the liquid level meter flange, the upper connecting flange and the lower connecting flange are connected via bolts, and the liquid level meter probe extends into the supporting tube.

[0007] The purge unit includes a purge gas storage tank, a purge gas input pipe, a purge gas ring pipe and a nozzle. The two ends of the purge gas input pipe are respectively connected to the purge gas storage tank and the purge gas ring pipe. The purge gas ring pipe is connected to the inner wall of the support tube. The purge gas ring pipe is connected to nozzles at equal distances along the circumference, and the nozzles are all facing the liquid level meter probe.

[0008] Optionally, the purge unit is connected to a lifting mechanism, which includes a motor, a rotating shaft, a spur gear and a rack. The motor is arranged outside the support tube, and both ends of the rotating shaft are respectively connected to the output end of the motor and the center axis of the spur gear, and the spur gear is meshingly connected to the rack.

[0009] A long strip hole is opened on the side wall of the support cylinder, and a connecting rod is fixedly arranged in the middle part of the side of the rack away from the spur gear. The connecting rod passes through the long strip hole and is fixedly connected to the purge gas ring pipe. The purge gas input pipe extends into from the side of the rack and passes through the connecting rod to be connected with the purge gas ring pipe.

[0010] Optionally, a vertical slide groove is provided on the inner wall of the support tube, and a protrusion is fixedly provided on the outer side of the purge air ring tube, and the protrusion is embedded in the slide groove.

[0011] Optionally, a solvent barrel is further provided on the outside of the support tube, and the solvent barrel is connected to the purge gas input pipe through a solvent pipeline.

[0012] Optionally, the output port of the purge gas storage tank is provided with a gas regulating valve, and the output port of the solvent barrel is provided with a solvent regulating valve.

[0013] Optionally, a heater is provided at a position of the purge gas input pipe close to the rack.

[0014] Optionally, a pressure pump is connected to the purge gas input pipe.

[0015] The liquid level measuring device provided in the present application realizes accurate measurement of the liquid level and has the following beneficial effects compared with the prior art:

[0016] (1) The level gauge is connected to the container through the connecting flange, and the level gauge flange connects the level gauge to the upper connecting flange. This arrangement facilitates the disassembly and installation of the level gauge. A support cylinder is provided between the upper connecting flange and the lower connecting flange, and is connected to the purge unit through the support cylinder, so that the purge unit can purge gas to the level gauge probe. The gas evaporated from the liquid in the material in the container adheres to the surface of the level gauge probe. The purge unit can blow away the condensed liquid condensed on the surface of the level gauge probe to keep the surface of the level gauge probe free of condensed liquid, thereby avoiding the influence of condensed liquid on the level gauge probe during the measurement process and improving the accuracy of the level gauge in measuring the liquid level.

[0017] (2) The purge unit is raised and lowered by setting a lifting mechanism to adapt to liquid level gauge probes of different heights. The lifting mechanism includes a motor, a rotating shaft, a spur gear and a rack. The motor drives the rotating shaft to rotate, and the rotating shaft drives the spur gear to rotate. The spur gear is meshed with the rack. The rotation of the gear drives the rack to perform a linear motion of rising or falling, and then the rack drives the connecting rod to move, and the connecting rod drives the purge gas ring pipe to rise or fall. This makes it easy to set liquid level gauge probes of different heights in the container as needed, making the setting of the liquid level gauge more convenient. At the same time, it helps to adjust the purge unit according to the height of the liquid level gauge probe, thereby improving the convenience of the purge unit.

[0018] (3) A vertical slide groove is provided on the inner wall of the support tube, and the protrusion on the purge air ring tube is embedded in the slide groove, which is used to provide a sliding track for the purge air ring tube during the lifting process, so that the purge air ring tube can move in the vertical direction, avoiding the direction of the purge air ring tube from being offset, which is beneficial to the stable lifting and lowering of the purge air ring tube, ensuring the removal of condensate on the liquid level gauge probe, and improving the measurement accuracy and reliability of the liquid level gauge.

[0019] (4) A solvent barrel is set up, and the solvent is input into the purge gas input pipe through the solvent pipeline, and then the solvent is sprayed toward the level gauge probe through the purge gas ring pipe and the nozzle. After the attachments on the surface of the level gauge probe are dissolved and fall into the container, the purge gas in the purge gas storage tank is input into the purge gas ring pipe and the nozzle through the purge gas input pipe to blow away the residual solvent. The solvent in the solvent barrel is the solvent in the slurry placed in the container, so that the purpose of removing the attachments on the surface of the level gauge probe is achieved without introducing new solvent, and having no effect on the properties of the slurry to be measured in the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a liquid level measuring device provided in one embodiment of the present application;

[0022] Figure 2 A schematic structural diagram of a liquid level measuring device provided in another embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a lifting mechanism provided in one embodiment of the present application;

[0024] Figure 4A schematic structural diagram of a liquid level measuring device provided in yet another embodiment of the present application;

[0025] Description of reference numerals:

[0026] 1: Liquid level meter, 2: Connecting flange, 3: Container, 7: Booster pump, 110: Liquid level meter flange, 120: Liquid level meter probe, 210: Upper connecting flange, 220: Lower connecting flange, 230: Support cylinder, 231: Long strip hole, 232: Slide, 410: Purge gas storage tank, 411: Gas regulating valve, 420: Purge gas input pipe, 430: Purge gas ring pipe, 431: Bump, 440: Nozzle, 510: Motor, 520: Rotating shaft, 530: Gear, 531: Connecting rod, 540: Rack, 610: Solvent barrel, 611: Solvent regulating valve, 620: Solvent pipeline, 630: Heater. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0028] like Figure 1 , Figure 2 As shown, the present application provides a liquid level measuring device, including: a liquid level meter 1, a connecting flange 2, a container 3 and a purge unit, and the liquid level meter 1 is connected to the container 3 through the connecting flange 2.

[0029] The connecting flange 2 includes an upper connecting flange 210 and a lower connecting flange 220. The lower connecting flange 220 is connected to the top of the container 3. A support tube 230 is arranged between the upper connecting flange 210 and the lower connecting flange 220. The bottom of the liquid level gauge 1 is connected to the upper connecting flange 210 via the liquid level gauge flange 110. The upper connecting flange 210 and the lower connecting flange 220 are connected via bolts. The liquid level gauge probe 120 extends into the support tube 230.

[0030] The purge unit includes a purge gas storage tank 410, a purge gas input pipe 420, a purge gas ring pipe 430 and a nozzle 440. The two ends of the purge gas input pipe 420 are respectively connected to the purge gas storage tank 410 and the purge gas ring pipe 430. The purge gas ring pipe 430 is connected to the inner wall of the support tube 230. The purge gas ring pipe 430 is connected to the nozzles 440 at equal distances along the circumferential direction. The nozzles 440 are all facing the liquid level meter probe 120.

[0031] Specifically, the connecting flange 2 is used to connect the liquid level meter 1 and the container 3. The liquid level meter 1 is a radar liquid level meter. The connecting flange 2 includes an upper connecting flange 210 and a lower connecting flange 220. The liquid level meter flange 110 is used to connect the liquid level meter 1 and the upper connecting flange 210. This arrangement facilitates the disassembly and installation of the liquid level meter 1. A support cylinder 230 is provided between the upper connecting flange 210 and the lower connecting flange 220. The support cylinder 230 is connected to the purge unit so that the purge unit can purge gas to the liquid level meter probe 120. The gas evaporated from the liquid in the material in the container 3 adheres to the surface of the liquid level meter probe 120. The purge unit can blow away the condensed liquid condensed on the surface of the liquid level meter probe 120 to keep the surface of the liquid level meter probe 120 free of condensed liquid, thereby avoiding the influence of the condensed liquid on the liquid level meter probe 120 during the measurement process, and improving the accuracy of the liquid level measurement of the liquid level meter 1.

[0032] The purge unit includes a purge gas storage tank 410, a purge gas input pipe 420, a purge gas ring pipe 430 and a nozzle 440. The purge gas storage tank 410 provides purge gas, and the gas is transmitted to the purge gas ring pipe 430 through the purge gas input pipe 420. Finally, the purge gas is blown toward the liquid level gauge probe 120 through the nozzle 440. In this arrangement, the condensate attached to the liquid level gauge probe 120 can be blown off in time through the impact force of the purge gas, thereby improving the detection accuracy of the liquid level gauge 1. At the same time, it is beneficial for the staff to replenish the container 3 according to the measurement result of the liquid level gauge 1, which is convenient for the staff to operate.

[0033] The purge gas ring pipe 430 is connected to the inner wall of the support tube 230, and the nozzles 440 are all directed toward the liquid level gauge probe 120. This can improve the purge gas's purge efficiency on the condensate on the liquid level gauge probe 120, and also reduce the amount of purge gas used, saving costs.

[0034] The present application realizes accurate measurement of liquid level through the above scheme. The liquid level meter is connected to the container through the connecting flange, and the liquid level meter flange connects the liquid level meter to the upper connecting flange. Such a configuration facilitates the disassembly and installation of the liquid level meter. A support cylinder is provided between the upper connecting flange and the lower connecting flange, and is connected to the purge unit through the support cylinder, so that the purge unit can purge gas to the liquid level meter probe. The gas evaporated from the liquid in the material in the container adheres to the surface of the liquid level meter probe. The purge unit can blow away the condensed liquid condensed on the surface of the liquid level meter probe to keep the surface of the liquid level meter probe free of condensed liquid, thereby avoiding the influence of condensed liquid on the liquid level meter probe during the measurement process and improving the accuracy of the liquid level measurement by the liquid level meter.

[0035] like Figure 2 and Figure 3As shown, optionally, the purge unit is connected to a lifting mechanism, which includes a motor 510, a rotating shaft 520, a spur gear 530 and a rack 540. The motor 510 is arranged outside the support cylinder 230, and the two ends of the rotating shaft 520 are respectively connected to the output end of the motor 510 and the central axis of the spur gear 530, and the spur gear 530 is meshingly connected to the rack 540.

[0036] A long strip hole 231 is opened on the side wall of the support cylinder 230, and a connecting rod 531 is fixedly arranged in the middle part of the side of the rack 540 away from the spur gear 530. The connecting rod 531 passes through the long strip hole 231 and is fixedly connected to the purge gas ring pipe 430. The purge gas input pipe 420 extends from the side of the rack 540 and passes through the connecting rod 531 to be connected with the purge gas ring pipe 430.

[0037] Specifically, the lifting mechanism is used to lift the purge unit so as to adapt to different heights of the liquid level gauge probe 120. The lifting mechanism includes a motor 510, a rotating shaft 520, a spur gear 530 and a rack 540. The motor 510 is arranged outside the support cylinder 230 to provide power to the lifting mechanism. The two ends of the rotating shaft 520 are respectively connected to the output end of the motor 510 and the central axis of the spur gear 530 to transmit the power of the motor 510 to the spur gear 530. The motor 510 drives the rotating shaft 520 to rotate, and the rotating shaft 520 drives the spur gear 530 to rotate. The length direction of the rack 540 is parallel to the height direction of the support cylinder 230, and the spur gear 530 is parallel to the height direction of the support cylinder 230. 30 is meshedly connected with the rack 540. The rotation of the gear 530 can drive the rack 540 to perform a linear motion of rising or falling, so that the rack 540 drives the connecting rod 531 to move, and the connecting rod 531 drives the purge air ring tube 430 to rise or fall. This makes it easy to set liquid level gauge probes 120 of different heights in the container 3 as needed, making the setting of the liquid level gauge 1 more convenient. At the same time, it helps to adjust the purge unit according to the height of the liquid level gauge probe 120, thereby improving the convenience of the purge unit.

[0038] Among them, the purge gas input pipe 420 extends from the side of the rack 540 and passes through the connecting rod 531 to be connected with the purge gas ring pipe 430. The purge gas input pipe 420 has a sufficient length between the purge gas storage tank 410 and the rack 540 so that the purge gas input pipe 420 can move along with the purge gas ring pipe 430 during the lifting process, which is beneficial to the stable output of the purge gas.

[0039] like Figure 2 and Figure 3 As shown, optionally, a vertical slide groove 232 is provided on the inner wall of the support tube 230 , and a protrusion 431 is fixedly provided on the outer side of the purge air ring tube 430 , and the protrusion 431 is embedded in the slide groove 232 .

[0040] Specifically, a vertical slide groove 232 is provided on the inner wall of the support tube 230, and the protrusion 431 of the purge air ring tube 430 is embedded in the slide groove 232, which is used to provide a sliding trajectory for the purge air ring tube 430 during the lifting process, so that the purge air ring tube 430 can move in the vertical direction, avoiding the direction of the purge air ring tube 430 from being offset, which is beneficial to the stable lifting and lowering of the purge air ring tube 430, ensuring the removal of condensate on the liquid level meter probe 120, and improving the measurement accuracy of the liquid level meter 1.

[0041] like Figure 4 As shown, optionally, a solvent barrel 610 is further disposed outside the support cylinder 230 , and the solvent barrel 610 is connected to the purge gas input pipe 420 through a solvent pipeline 620 .

[0042] Specifically, water is usually placed in the container 3, and the level meter 1 is used to detect the liquid level of the water surface. The water vapor generated in the water moves upward and condenses on the surface of the level meter probe 120. The purge unit is used to blow away the condensed water on the surface of the level meter probe 120. Since the viscosity of the condensed water is relatively low, it is convenient for the purge unit to blow it away through the purge gas. However, if a slurry with a relatively high viscosity is placed in the container 3, the condensation on the surface of the level meter probe 120 will form a substance with a certain viscosity or a crystalline substance. In this case, it is necessary to spray the solvent to the surface of the level meter probe 120 through the solvent pipeline 620, dissolve the condensate on the surface of the level meter probe 120 and make it fall with the solvent, and then purge it by introducing the purge gas to complete the removal of the attachments on the surface of the level meter probe 120, so as to ensure the accuracy of the measurement data of the level meter 1. The solvent in the solvent barrel 610 is the solvent in the slurry placed in the container 3, so that the purpose of removing the attachments on the surface of the liquid level meter probe 120 is achieved without introducing new solvent, and the properties of the slurry to be measured in the container 3 are not affected. At the same time, the solvent is sprayed toward the liquid level meter probe 120 through the nozzle 440, which not only reduces the amount of solvent used, but also has little effect on the liquid level in the container 3.

[0043] The solvent is input into the purge gas input pipe 420 through the solvent pipeline 620, and then the solvent is sprayed toward the liquid level meter probe 120 through the purge gas ring pipe 430 and the nozzle 440. After the attachments on the surface of the liquid level meter probe 120 are dissolved and fall into the container 3, the purge gas in the purge gas storage tank 410 is input to the purge gas ring pipe 430 and the nozzle 440 through the purge gas input pipe 420 to blow away the residual solvent, thereby ensuring the cleanliness of the liquid level meter probe 120, which is beneficial to the measurement accuracy of the liquid level meter 1.

[0044] Optionally, a gas regulating valve 411 is provided at the output port of the purge gas storage tank 410 , and a solvent regulating valve 611 is provided at the output port of the solvent barrel 610 .

[0045] Specifically, the flow rate of the purge gas is adjusted by the gas regulating valve 411, and the amount of the solvent entering the purge gas ring pipe 430 is adjusted by the solvent regulating valve 611, thereby improving the convenience of use of the purge unit.

[0046] Optionally, a heater 630 is provided at a position of the purge gas input pipe 420 close to the rack 540 .

[0047] Specifically, the heater 630 is used to heat the purge gas or solvent entering the purge gas input pipe 420. The purge gas with a certain temperature can improve the efficiency of blowing off the condensate on the surface of the liquid level meter probe 120 and accelerate the falling of the condensate. At the same time, the heater 630 can heat the solvent entering the purge gas input pipe 420 in a low temperature environment to avoid the problem of the solvent freezing at low temperature, which is conducive to the stable operation of the purge unit.

[0048] Optionally, a pressure pump 7 is connected to the purge gas input pipe 420 .

[0049] Specifically, the setting of the pressure pump 7 can increase the pressure of the purge gas or solvent in the purge gas inlet pipe 420, thereby increasing the pressure of the purge gas or solvent sprayed out by the nozzle 440, and increasing the impact force of the purge gas or solvent spraying, which is beneficial to the falling of the condensate on the surface of the liquid level meter probe 120, thereby ensuring the cleanliness of the liquid level meter probe 120.

[0050] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0051] The operation flow of the liquid level measuring device in this embodiment during specific operation is as follows:

[0052] The liquid level meter 1 is connected to the upper connecting flange 210, the upper connecting flange 210 and the lower connecting flange 220 are connected by bolts, and a support tube 230 is arranged between the upper connecting flange 210 and the lower connecting flange 220, the lower connecting flange 220 is connected to the top side of the container 3, and the liquid level meter probe 120 extends into the support tube 230. The material to be measured is placed in the container 3. The gas regulating valve 411 is opened, and the gas in the purge gas storage tank 410 is transmitted to the purge gas ring pipe 430 through the purge gas input pipe 420, and finally the purge gas is blown to the liquid level meter probe 120 through the nozzle 440. This arrangement can timely blow off the condensate attached to the liquid level meter probe 120, improve the accuracy of the detection of the liquid level meter 1, and at the same time, it is beneficial for the staff to replenish the container 3 according to the measurement result of the liquid level meter 1, which is convenient for the staff to operate.

[0053] The motor 510 drives the rotating shaft 520 to rotate, and the rotating shaft 520 drives the spur gear 530 to rotate. The length direction of the rack 540 is parallel to the height direction of the support tube 230, and the spur gear 530 is meshingly connected with the rack 540. The rotation of the gear 530 can drive the rack 540 to perform a linear motion of rising or falling, and then the rack 540 drives the connecting rod 531 to move, and the connecting rod 531 drives the purge air ring tube 430 to rise or fall in the direction of the slide groove 232 in the support tube 230, which makes the setting of the liquid level meter 1 more convenient, helps to adjust the purge unit according to the height of the liquid level meter probe 120, and improves the convenience of the purge unit.

[0054] If a slurry with high viscosity is placed in the container 3, condensation on the surface of the liquid level meter probe 120 will form a substance with a certain viscosity or a crystalline substance. The solvent regulating valve 611 is opened, and the solvent is input into the purge gas input pipe 420 through the solvent pipeline 620. The solvent is then sprayed toward the liquid level meter probe 120 through the purge gas ring pipe 430 and the nozzle 440. After the attachments on the surface of the liquid level meter probe 120 are dissolved and fall into the container 3, the gas regulating valve 411 is opened again, and the purge gas in the purge gas storage tank 410 is input to the purge gas ring pipe 430 and the nozzle 440 through the purge gas input pipe 420 to blow away the residual solvent and ensure the cleanliness of the liquid level meter probe 120.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid level measuring device, characterized in that: include: A liquid level meter (1), a connecting flange (2), a container (3), and a purge unit, wherein the liquid level meter (1) is connected to the container (3) via the connecting flange (2); The connecting flange (2) comprises an upper connecting flange (210) and a lower connecting flange (220); the lower connecting flange (220) is connected to the top of the container (3); a supporting tube (230) is provided between the upper connecting flange (210) and the lower connecting flange (220); the bottom of the liquid level gauge (1) is connected to the upper connecting flange (210) via the liquid level gauge flange (110); the upper connecting flange (210) and the lower connecting flange (220) are connected via bolts; and the liquid level gauge probe (120) extends into the supporting tube (230); The purge unit comprises a purge gas storage tank (410), a purge gas input pipe (420), a purge gas ring pipe (430) and a nozzle (440); the two ends of the purge gas input pipe (420) are respectively connected to the purge gas storage tank (410) and the purge gas ring pipe (430); the purge gas ring pipe (430) is connected to the inner wall of the support cylinder (230); the purge gas ring pipe (430) is connected to the nozzles (440) at equal distances along the circumferential direction; the nozzles (440) are all directed toward the liquid level meter probe (120).

2. The liquid level measuring device according to claim 1, characterized in that: The purge unit is connected to a lifting mechanism, the lifting mechanism comprising a motor (510), a rotating shaft (520), a spur gear (530) and a rack (540), the motor (510) being arranged outside the support cylinder (230), the two ends of the rotating shaft (520) being respectively connected to the output end of the motor (510) and the central axis of the spur gear (530), and the spur gear (530) being meshingly connected to the rack (540); A long strip hole (231) is provided on the side wall of the support cylinder (230); a connecting rod (531) is fixedly provided at the middle of a side of the rack (540) away from the spur gear (530); the connecting rod (531) passes through the long strip hole (231) and is fixedly connected to the purge gas ring pipe (430); the purge gas input pipe (420) extends from the side of the rack (540) and passes through the connecting rod (531) to be connected to the purge gas ring pipe (430).

3. The liquid level measuring device according to claim 2, characterized in that: A vertical slide groove (232) is provided on the inner wall of the support cylinder (230), and a protrusion (431) is fixedly provided on the outer side of the purge gas ring tube (430), and the protrusion (431) is embedded in the slide groove (232).

4. The liquid level measuring device according to any one of claims 1 to 3, characterized in that: A solvent barrel (610) is also provided outside the support cylinder (230), and the solvent barrel (610) is connected to the purge gas input pipe (420) via a solvent pipeline (620).

5. The liquid level measuring device according to claim 4, characterized in that: The output port of the purge gas storage tank (410) is provided with a gas regulating valve (411), and the output port of the solvent barrel (610) is provided with a solvent regulating valve (611).

6. The liquid level measuring device according to claim 3, characterized in that: A heater (630) is provided at a position of the purge gas input pipe (420) close to the rack (540).

7. The liquid level measuring device according to claim 6, characterized in that: The purge gas input pipe (420) is connected to a pressure pump (7).

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