Double-layer filter auxiliary structure of liquid level meter based on working cylinder structure

Abstract

The utility model discloses a liquid level meter double -deck filter auxiliary structure based on work cylinder structure, including work cylinder, work cylinder is provided with coarse filter screen and fine filter screen side by side, the mesh of fine filter screen is smaller than the mesh of coarse filter screen, the both ends of coarse filter screen, the both ends of fine filter screen all are pasted with the inner wall of work cylinder, the lateral wall of one side work cylinder of coarse filter screen is equipped with liquid inlet, and the lateral wall of one side work cylinder of fine filter screen is equipped with liquid outlet, liquid inlet is used for connecting the liquid level device of measurement, and liquid outlet is used for connecting the communication pipe type liquid level meter, the utility model discloses through the filter work cylinder of building independently in main liquid level meter, and adopts coarse / fine double -deck filter screen grading filtration structure and gradually traps different particle size impurities, and respectively effectively intercepts the particle of different particle size in liquid, silt and the crystallization of separation, and from the source, blocks the impurity into the liquid level meter core measuring unit, and the liquid level meter failure rate is reduced significantly, ensures the data accuracy and system stability under the condition of long -term unattended.

Description

Technical Field

[0001] This utility model relates to the field of industrial process detection and control technology, and more specifically, to a double-layer filter auxiliary structure for a level gauge based on a working cylinder structure. Background Technology

[0002] In industrial production, level gauges are critical process parameter monitoring devices, and their accuracy directly affects the stability and safety of the process flow. Currently widely used connecting pipe level gauges (including magnetic float level gauges and double-flange level gauges) rely on a direct connection between the measured liquid and the measuring pipeline to transmit the liquid level. Their working principle is that the medium enters the working cylinder of the level gauge directly through the connecting pipe and acts on the float. The up-and-down movement of the float causes a strong magnetic field on the float to actuate the magnetic float on the display panel, showing the height of the liquid level in the container.

[0003] In practical applications, the following significant technical bottlenecks have been found in this type of connecting pipe level gauge: (1) High sensitivity to impurities: When the liquid being measured contains solid particles, fibrous impurities or precipitates, the impurities are easily carried into the internal channel of the level gauge by the fluid, causing the float to get stuck, the magnetic components to fail or the pressure port to be blocked, resulting in distorted level display or even complete failure; (2) High maintenance costs: Traditional level gauges lack an effective pretreatment structure and require frequent shutdowns to disassemble and clean internal impurities, which not only increases the frequency of manual intervention but may also cause production losses due to shutdowns; (3) Poor long-term stability: The accumulation of impurities will accelerate the wear of the seals and shorten the service life of the equipment, especially in high viscosity or corrosive media environments.

[0004] While adding a simple external filter can slightly alleviate the problem in some scenarios, conventional filters generally have drawbacks such as low filtration accuracy, easy secondary clogging, and inconvenient sewage discharge operations, which cannot meet the high reliability requirements of continuous production.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] The technical problem this invention aims to solve is that current external filtration structures for level gauges suffer from drawbacks such as low filtration accuracy, susceptibility to secondary clogging, and inconvenient sewage discharge, failing to meet the high reliability requirements of continuous production. The goal is to provide a dual-layer filtration auxiliary structure for level gauges based on a working cylinder structure. By constructing a filtration working cylinder independent of the main level gauge and employing a coarse / fine dual-layer filter structure to progressively intercept impurities of different particle sizes, this structure effectively intercepts particulate matter, silt, and precipitated crystals of varying sizes in the liquid. This prevents impurities from entering the core measurement unit of the level gauge at the source, allowing sufficient space for impurity deposition, delaying saturation time, significantly reducing the level gauge failure rate, and ensuring data accuracy and system stability under long-term unattended operation conditions.

[0007] This utility model is achieved through the following technical solution: A level gauge dual-layer filtration auxiliary structure based on a working cylinder includes a working cylinder, on which a coarse filter screen and a fine filter screen are arranged side by side; the mesh size of the fine filter screen is smaller than that of the coarse filter screen. Both ends of the coarse filter screen and both ends of the fine filter screen are in contact with the inner wall of the working cylinder; An inlet is provided on the side wall of the working cylinder on the side where the coarse filter is located, and an outlet is provided on the side wall of the working cylinder on the side where the fine filter is located. The inlet is used to connect to the liquid level device to be measured, and the outlet is used to connect to the connecting tube type liquid level gauge.

[0008] This invention constructs a filter working cylinder independent of the main liquid level gauge and adopts a coarse / fine double-layer filter structure to progressively intercept impurities of different particle sizes. It effectively intercepts particulate matter, silt, and precipitated crystals of different sizes in the liquid, blocking impurities from entering the core measuring unit of the liquid level gauge at the source. It also provides sufficient space for impurity deposition, delays saturation time, significantly reduces the failure rate of the liquid level gauge, and ensures data accuracy and system stability under long-term unattended conditions.

[0009] The working cylinder can be designed with a larger volume, 1.5 times the diameter of the original level gauge, allowing ample space for filtered impurities to settle and delaying saturation. Furthermore, a two-layer filter system is used: a coarse filter at the front of the inlet, with a larger mesh size, quickly traps large particles; a fine filter at the rear, in the middle of the working cylinder, with a higher mesh size, precisely captures fine particles and colloidal substances. This allows impurities to be stratified and retained on the dual-layer filter based on their particle size, preventing instantaneous overload clogging of a single filter and effectively avoiding blockage of the working cylinder, thus extending the maintenance cycle. Moreover, the filter can be replaced individually, shortening maintenance time and reducing maintenance costs.

[0010] This invention ensures the sensitive response of measuring mechanisms such as magnetic flip plates and differential pressure by physically isolating impurities from the level gauge measuring elements (such as floats and diaphragms), with a level indication error of ≤±2mm, meeting the requirements of high-precision control and providing accurate input for automated control systems.

[0011] This utility model's structure is compatible with existing mainstream liquid level gauge models (such as side-mounted magnetic flip-type and remote transmission flange type), and can be directly embedded as a standardized accessory without changing the original process flow.

[0012] In one specific embodiment, a drain port is provided at the bottom of the working cylinder.

[0013] In one specific embodiment, a quick-opening drain valve is installed at the drain outlet.

[0014] In one specific embodiment, the drain outlet has a conical structure that is larger at the top and smaller at the bottom.

[0015] This invention, by setting a conical drain outlet and a quick-opening drain valve, can utilize the conical contraction structure to quickly settle and discharge impurities deposited in the working cylinder through gravity acceleration, facilitating the cleaning of impurities in the working cylinder and realizing online discharge of impurities without the need to shut down the equipment or open the cover, reducing maintenance time by 70%; the drain outlet can be connected to a dedicated collection pipe to prevent secondary pollution.

[0016] In one specific embodiment, the coarse filter screen has a mesh size of 80-100 mesh, used to trap large particle size impurities > 0.1 mm, while the fine filter screen has a mesh size of 200-300 mesh, used to trap fine particles and colloidal substances. The specific selection of the mesh size combination of the coarse and fine filter screens can be flexibly adjusted according to the characteristics of the liquid medium being tested.

[0017] In one specific embodiment, both the coarse filter and the fine filter are arranged parallel to the axis of the working cylinder, and the coarse filter and the fine filter are arranged in parallel.

[0018] In one specific embodiment, both the coarse filter and the fine filter are arranged parallel to the axis of the working cylinder. The coarse filter and the fine filter are not parallel and are arranged at a certain angle. The distance between one side of the coarse filter and one side of the fine filter is greater than the distance between the other side of the coarse filter and the other side of the fine filter.

[0019] By setting the coarse and fine filters at a certain angle in the transverse direction, the space between the coarse and fine filters can be relatively increased, thus reserving more space for fine particles and colloidal substances to deposit, and avoiding the situation where the fine filter is more easily clogged due to its small mesh size.

[0020] In one specific embodiment, the coarse filter screen is arranged parallel to the axis of the working cylinder, and the fine filter screen is arranged at a certain angle to the coarse filter screen. The distance between the upper end of the fine filter screen and the upper end of the coarse filter screen is smaller than the distance between the lower end of the fine filter screen and the lower end of the coarse filter screen.

[0021] By setting the coarse and fine filter screens at a certain angle in the longitudinal direction, a space with a smaller top and a larger bottom is formed between the coarse and fine filter screens. This leaves more space at the bottom of the working cylinder, preventing impurities from accumulating too much or being squeezed too tightly at the bottom, which would affect the flow of liquid. At the same time, the fine filter screen is set at an angle, which makes it easier for the impurities to fall to the bottom of the working cylinder under their own weight, preventing them from being discharged from the drain port.

[0022] In one specific embodiment, a liquid inlet connecting pipe is vertically installed at the liquid inlet on the outside of the working cylinder, connecting the working cylinder to the liquid level device to be measured. A liquid outlet connecting pipe is installed at the liquid outlet on the outside of the working cylinder, connecting the working cylinder to the through-tube type level gauge. In this invention, the liquid inlet connecting pipe is designed with a tangential inlet, which allows the liquid to enter the working cylinder and descend in a spiral motion, thereby enhancing the impurity separation efficiency through centrifugal force.

[0023] In addition, the inlet and outlet connecting pipes are located in the lower half of the working cylinder, and the upper half of the working cylinder is also equipped with connecting pipes on both sides, which are respectively connected to the liquid level device to be measured and the connecting pipe type liquid level gauge, so as to ensure the connection and uniformity of the air pressure between the two.

[0024] In one specific embodiment, the inner wall of the working cylinder has a smooth mirror surface structure, which can reduce the dead zones of turbulence in the liquid within the working cylinder, thereby reducing the growth of microorganisms.

[0025] In one specific embodiment, the top of the working cylinder has a maintenance port, and an end cover can be detachably installed at the maintenance port. During maintenance, the end cover can be opened from the top to clean or replace the filter screen.

[0026] When installing the filter auxiliary structure of this utility model, the working cylinder is installed between the level gauge and the container. Then, the valve of the upper and lower connecting pipe is opened. After checking for leaks, it is ready. Sewage can be discharged on schedule, and the filter screen can be cleaned or replaced every year.

[0027] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. The dual-layer filter auxiliary structure for a level gauge based on a working cylinder structure provided in this utility model embodiment constructs a filter working cylinder independent of the main level gauge and adopts a coarse / fine dual-layer filter screen hierarchical filtration structure to intercept impurities of different particle sizes step by step. It effectively intercepts particulate matter, silt, and precipitated crystals of different particle sizes in the liquid, blocking impurities from entering the core measurement unit of the level gauge from the source, reserving sufficient space for impurity deposition, delaying saturation time, significantly reducing the failure rate of the level gauge, and ensuring data accuracy and system stability under long-term unattended conditions; 2. The dual-layer filtration auxiliary structure of the level gauge based on the working cylinder structure provided in this utility model embodiment can intercept more than 95% of impurities of different particle sizes through the two-layer filtration design. The coarse filter screen is set at the front end of the liquid inlet direction and adopts a larger mesh size to quickly intercept large particle size impurities. The fine filter screen is located at the rear end of the liquid inlet direction, in the middle of the working cylinder, and adopts a higher mesh size to accurately capture fine particles and colloidal substances. This allows impurities to be layered and retained on the dual-layer filter screen according to their different particle sizes, avoiding instantaneous overload clogging of the single-layer filter screen, effectively avoiding clogging of the working cylinder, and extending the cycle of single maintenance in the working cylinder. 3. The dual-layer filter auxiliary structure of the level gauge based on the working cylinder structure provided in this embodiment of the utility model, by setting a conical drain port and a quick-opening drain valve, can utilize the conical contraction structure to quickly settle and discharge the impurities deposited in the working cylinder through the acceleration of gravity, which is convenient for cleaning the impurities in the working cylinder, realizes online discharge of impurities, and eliminates the need to stop the equipment or open the cover for operation, reducing maintenance time by 70%; 4. The dual-layer filter auxiliary structure for level gauges based on the working cylinder structure provided in this embodiment of the utility model solves the core pain point that restricts the reliable application of level gauges in unattended, high-risk and complex media scenarios through innovative improvements to the mechanical structure, and has both technological advancement and engineering practicality. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the connection structure between the double-layer filter auxiliary structure and the level gauge provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the internal structure of the working cylinder provided in an embodiment of the present utility model; Figure 3 A top view of the coarse and fine filter screens arranged opposite each other in an embodiment of this utility model; Figure 4 This is a side view of the coarse filter and fine filter provided in an embodiment of the present invention.

[0030] The attached diagram shows the markings and corresponding component names: 1-Working cylinder, 2-Coarse filter screen, 3-Fine filter screen, 4-Inlet, 5-Outlet, 6-Connecting tube type level gauge, 7-Quick-opening drain valve, 8-End cap. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0032] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures are not specifically described in order to avoid obscuring the present invention.

[0033] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. Example

[0035] like Figures 1-4 As shown in the figure, the liquid level gauge double-layer filter auxiliary structure based on the working cylinder structure provided by this utility model includes a working cylinder 1, wherein a coarse filter 2 and a fine filter 3 are arranged side by side in the working cylinder 1; the mesh size of the fine filter 3 is smaller than that of the coarse filter 2. Both ends of the coarse filter 2 and both ends of the fine filter 3 are in contact with the inner wall of the working cylinder 1; An inlet 4 is provided on the side wall of the working cylinder 1 on the side where the coarse filter 2 is located, and an outlet 5 is provided on the side wall of the working cylinder 1 on the side where the fine filter 3 is located. The inlet 4 is used to connect to the liquid level device to be measured, and the outlet 5 is used to connect to the connecting tube type liquid level gauge 6.

[0036] This invention constructs a filter working cylinder independent of the main liquid level gauge and adopts a coarse / fine double-layer filter structure to progressively intercept impurities of different particle sizes. It effectively intercepts particulate matter, silt, and precipitated crystals of different sizes in the liquid, blocking impurities from entering the core measuring unit of the liquid level gauge at the source. It also provides sufficient space for impurity deposition, delays saturation time, significantly reduces the failure rate of the liquid level gauge, and ensures data accuracy and system stability under long-term unattended conditions.

[0037] The working cylinder can be designed with a larger volume, 1.5 times the diameter of the original level gauge, allowing ample space for filtered impurities to settle and delaying saturation. Furthermore, a two-layer filter system is used: a coarse filter at the front of the inlet, with a larger mesh size, quickly traps large particles; a fine filter at the rear, in the middle of the working cylinder, with a higher mesh size, precisely captures fine particles and colloidal substances. This allows impurities to be stratified and retained on the dual-layer filter based on their particle size, preventing instantaneous overload clogging of a single filter and effectively avoiding blockage of the working cylinder, thus extending the maintenance cycle. Moreover, the filter can be replaced individually, shortening maintenance time and reducing maintenance costs.

[0038] This invention ensures the sensitive response of measuring mechanisms such as magnetic flip plates and differential pressure by physically isolating impurities from the level gauge measuring elements (such as floats and diaphragms), with a level indication error of ≤±2mm, meeting the requirements of high-precision control and providing accurate input for automated control systems.

[0039] This utility model's structure is compatible with existing mainstream liquid level gauge models (such as side-mounted magnetic flip-type and remote transmission flange type), and can be directly embedded as a standardized accessory without changing the original process flow.

[0040] In one specific embodiment, a drain port is provided at the bottom of the working cylinder 1.

[0041] In one specific embodiment, a quick-opening drain valve 7 is installed at the drain outlet.

[0042] In one specific embodiment, the drain outlet has a conical structure that is larger at the top and smaller at the bottom.

[0043] This invention, by setting a conical drain outlet and a quick-opening drain valve, can utilize the conical contraction structure to quickly settle and discharge impurities deposited in the working cylinder through gravity acceleration, facilitating the cleaning of impurities in the working cylinder and realizing online discharge of impurities without the need to shut down the equipment or open the cover, reducing maintenance time by 70%; the drain outlet can be connected to a dedicated collection pipe to prevent secondary pollution.

[0044] In one specific embodiment, the coarse filter 2 has a mesh size of 80-100 mesh, used to trap large particle impurities with a size >0.1mm, while the fine filter 3 has a mesh size of 200-300 mesh, used to trap fine particles and colloidal substances. The specific selection of the mesh size combination of the coarse and fine filters can be flexibly adjusted according to the characteristics of the liquid medium being tested.

[0045] In one specific embodiment, both the coarse filter 2 and the fine filter 3 are arranged parallel to the axis of the working cylinder 1, and the coarse filter 2 and the fine filter 3 are arranged in parallel.

[0046] In one specific embodiment, both the coarse filter 2 and the fine filter 3 are arranged parallel to the axis of the working cylinder 1. The coarse filter 2 and the fine filter 3 are not parallel and are arranged at a certain angle. The distance between one side of the coarse filter 2 and one side of the fine filter 3 is greater than the distance between the other side of the coarse filter 2 and the other side of the fine filter 3.

[0047] By setting the coarse filter and the fine filter at a certain angle in the transverse direction, the space between the coarse filter and the fine filter 3 can be relatively increased, thereby reserving more space for the deposition of fine particles and colloidal substances, and avoiding the situation where the fine filter 3 is more easily clogged due to its small mesh size.

[0048] In one specific embodiment, the coarse filter 2 is arranged parallel to the axis of the working cylinder 1, and the fine filter 3 is arranged at a certain angle to the coarse filter 2. The distance between the upper end of the fine filter 3 and the upper end of the coarse filter 2 is smaller than the distance between the lower end of the fine filter 3 and the lower end of the coarse filter 2.

[0049] By setting the coarse and fine filter screens at a certain angle in the longitudinal direction, a space with a smaller upper part and a larger lower part is formed between the coarse and fine filter screens, thus reserving more space at the bottom of the working cylinder and avoiding impurities from accumulating too much or being squeezed too tightly at the bottom, which would affect the flow of liquid. At the same time, the fine filter screen 3 is set at an angle, which makes it easier for the impurities trapped to fall to the bottom of the working cylinder under their own weight, preventing them from being discharged from the drain port.

[0050] In one specific embodiment, a liquid inlet connecting pipe is vertically installed at the external liquid inlet 4 of the working cylinder 1, through which the working cylinder 1 is connected to the liquid level measuring device. An outlet connecting pipe is installed at the external liquid outlet 5 of the working cylinder 1, through which the working cylinder 1 is connected to the connecting pipe type liquid level gauge 6. In this invention, the liquid inlet connecting pipe is designed with a tangential inlet, which allows the liquid to enter the working cylinder and descend in a spiral motion, thereby enhancing the impurity separation efficiency through centrifugal force.

[0051] In addition, the inlet and outlet connecting pipes are located in the lower half of the working cylinder, and the upper half of the working cylinder 1 is also equipped with connecting pipes on both sides, which are respectively connected to the liquid level device to be measured and the connecting pipe type liquid level gauge, so as to ensure the connection and uniformity of the air pressure between the two.

[0052] In one specific embodiment, the inner wall of the working cylinder 1 has a smooth mirror surface structure, which can reduce the dead angle of turbulence of liquid in the working cylinder, thereby reducing the growth of microorganisms.

[0053] In one specific embodiment, the top of the working cylinder 1 has a maintenance port, and an end cover 8 is detachably installed at the maintenance port. During maintenance, the end cover can be opened from the top to clean or replace the filter screen.

[0054] When installing the filter auxiliary structure of this utility model, the working cylinder is installed between the level gauge and the container. Then, the valve of the upper and lower connecting pipe is opened. After checking for leaks, it is ready. Sewage can be discharged on schedule, and the filter screen can be cleaned or replaced every year.

[0055] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A level gauge with a double-layer filter auxiliary structure based on a working cylinder structure, characterized in that, The device includes a working cylinder (1), on which a coarse filter screen (2) and a fine filter screen (3) are arranged side by side; the mesh size of the fine filter screen (3) is smaller than that of the coarse filter screen (2). Both ends of the coarse filter (2) and both ends of the fine filter (3) are in contact with the inner wall of the working cylinder (1); An inlet (4) is provided on the side wall of the working cylinder (1) on the side where the coarse filter (2) is located, and an outlet (5) is provided on the side wall of the working cylinder (1) on the side where the fine filter (3) is located. The inlet (4) is used to connect to the liquid level device to be measured, and the outlet (5) is used to connect to the connecting tube type liquid level gauge (6).

2. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, The bottom of the working cylinder (1) is provided with a drain port.

3. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 2, characterized in that, A quick-opening drain valve (7) is installed at the drain outlet.

4. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 3, characterized in that, The sewage outlet has a cone-shaped structure that is wider at the top and narrower at the bottom.

5. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, The coarse filter (2) has a mesh size of 80-100 mesh, and the fine filter (3) has a mesh size of 200-300 mesh.

6. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, Both the coarse filter (2) and the fine filter (3) are arranged parallel to the axis of the working cylinder (1).

7. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 6, characterized in that, The coarse filter (2) and the fine filter (3) are arranged in parallel.

8. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 6, characterized in that, The coarse filter (2) and the fine filter (3) are set at a certain angle, and the distance between one side of the coarse filter (2) and one side of the fine filter (3) is greater than the distance between the other side of the coarse filter (2) and the other side of the fine filter (3).

9. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, The coarse filter (2) is set parallel to the axis of the working cylinder (1), and the fine filter (3) is set at a certain angle to the coarse filter (2). The distance between the upper end of the fine filter (3) and the upper end of the coarse filter (2) is smaller than the distance between the lower end of the fine filter (3) and the lower end of the coarse filter (2).

10. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, The inner wall of the working cylinder (1) has a smooth mirror surface structure.

11. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, The top of the working cylinder (1) has a maintenance port, and an end cap (8) can be detachably installed at the maintenance port.

12. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, A liquid inlet connecting pipe is installed at the external liquid inlet (4) of the working cylinder (1) to connect the working cylinder (1) with the liquid level device to be measured.

13. The level gauge double-layer filter auxiliary structure based on the working cylinder structure according to claim 1, characterized in that, A liquid outlet connecting pipe is installed at the liquid outlet (5) outside the working cylinder (1) to connect the working cylinder (1) with the connecting pipe type liquid level gauge (6).

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