Pressure type liquid level gauge applicable to easily silted environment and preventing backflow of external water and its usage method

Abstract

The present invention provides a pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water, and a usage method. The controller is connected to a waterproof conduit, and the other end of the waterproof conduit is connected to a pressure sensor; a signal amplifier and an analog-to-digital converter are arranged inside the controller, and the signal amplifier and the analog-to-digital converter are electrically connected to the controller; the signal amplifier is electrically connected to the pressure sensor and is used for amplifying the analog signal output by the pressure sensor; the analog-to-digital converter converts the amplified analog signal into a digital signal, the controller converts the digital signal into a corresponding value, and displays it through a display. The present invention adds an anti-siltation auxiliary pipe and an anti-siltation auxiliary bin at the lower part of the pressure type liquid level gauge to solve the problem of inaccurate or delayed numerical values caused by siltation, and reforms the air hole connecting the upper part of the pressure type liquid level gauge to the negative pressure chamber so that the air hole of the negative pressure chamber can be automatically emptied even if water enters, avoiding the problem of inaccurate liquid level numerical values caused by water entering the air hole of the negative pressure chamber.

Description

Technical Field

[0001] The present invention belongs to the fields of municipal drainage engineering and water environment, and particularly relates to a pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water, and a using method thereof, which is applicable to the monitoring of the liquid level of water bodies. Background Art

[0002] The operation and maintenance of municipal drainage pipe networks, especially intelligent management, and other water environment projects all require the monitoring of the liquid level of water bodies in drainage pipe networks. Sometimes, ultrasonic liquid level gauges with sensitive signals are used. However, ultrasonic liquid level gauges are greatly affected by water vapor, vortices, bubbles, floating scum, etc. on the water surface, and the liquid level monitoring in restricted spaces is inaccurate when the water level is high. Generally, the signals of pressure type liquid level gauges are relatively stable and accurate. However, after the probe is covered by siltation, or when external water backflows into the air holes of the negative pressure chamber due to the rising water level, the liquid level data information may be greatly delayed or inaccurate. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water, and a using method thereof. The present invention adds an anti-siltation auxiliary pipe and an anti-siltation auxiliary chamber at the lower part of the pressure type liquid level gauge to solve the problem of inaccurate or delayed numerical values caused by siltation. The present invention reforms the air holes connecting the upper part of the pressure type liquid level gauge with the negative pressure chamber, so that even if water enters the air holes of the negative pressure chamber, it can be automatically emptied, avoiding the problem of inaccurate liquid level numerical values caused by water entering the air holes of the negative pressure chamber, which can significantly extend the reliable monitoring period of the liquid level gauge and reduce the maintenance frequency.

[0004] To achieve the above technical features, the object of the present invention is realized as follows: A pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water, which includes a controller. The controller is connected to a waterproof conduit, and the other end of the waterproof conduit is connected to a pressure sensor;

[0005] A signal amplifier and an analog-to-digital converter are arranged inside the controller, and the signal amplifier and the analog-to-digital converter are electrically connected to the controller;

[0006] The signal amplifier is electrically connected to the pressure sensor and is used to amplify the analog signal output by the pressure sensor;

[0007] The analog-to-digital converter converts the amplified analog signal into a digital signal, and the controller converts the digital signal into a corresponding numerical value and displays it through a display.

[0008] The controller includes an outer housing. The outer housing adopts a sealed and water-impermeable structure. An air chamber is arranged inside the outer housing. The air chamber is arranged obliquely. The upper part of the air chamber is connected to a ventilation pipe, the ventilation pipe is connected to the waterproof conduit, and the lower part of the air chamber is connected to an air port. The air port is arranged outside the outer housing.

[0009] The outer housing is made of metal or plastic;

[0010] The air chamber is made of a transparent material and has a certain strength to ensure that it is not easily deformed under external force.

[0011] The diameter of the ventilation pipe is the same as that of the waterproof conduit;

[0012] The air inlet is made of the same material as the ventilation pipe;

[0013] The cross-sectional size of the air inlet is larger than that of the ventilation pipe to ensure that the external water in the air chamber can be automatically discharged under the action of gravity.

[0014] The waterproof conduit is a hollow impermeable pipe with a certain strength, not easily shriveled and deformed under external extrusion, and is made of metal, plastic or rubber according to needs;

[0015] The waterproof conduit is in a straight non-bendable form or a bendable and coiled form;

[0016] The upper part of the waterproof conduit is connected to the lower part of the controller and is connected to the ventilation pipe, and the interface is sealed and impermeable; the lower part of the waterproof conduit is connected to the negative pressure chamber of the pressure sensor, and the interface is sealed and impermeable.

[0017] The pressure sensor consists of three parts: a pressure sensing structure located in the upper part of the pressure sensor, an anti-siltation auxiliary chamber located in the lower part of the pressure sensor, and an anti-siltation auxiliary pipe.

[0018] The negative pressure chamber in the upper part of the pressure sensing structure is connected to the waterproof conduit, and the interface is sealed and impermeable. The positive pressure chamber in the lower part is connected to the anti-siltation auxiliary chamber through a certain number of water-permeable holes arranged at intervals. A certain number of water-permeable holes are arranged at intervals in the lower part of the anti-siltation auxiliary chamber. The upper side of the anti-siltation auxiliary chamber is connected to the anti-siltation auxiliary pipe, and pores are arranged at intervals on the anti-siltation auxiliary pipe, so that the inside and outside of the anti-siltation auxiliary pipe are connected.

[0019] The pores should not be too large and their width should be significantly smaller than the inner diameter of the anti-siltation auxiliary pipe to reduce the debris entering the inside of the anti-siltation auxiliary pipe and reduce the possibility of pipeline blockage.

[0020] The anti-siltation auxiliary chamber is made of a corrosion-resistant material and has a certain strength and is not easily deformed;

[0021] The anti-siltation auxiliary pipe is made of corrosion-resistant metal, plastic or rubber;

[0022] The width of the pores is smaller than the inner diameter of the anti-siltation auxiliary pipe to reduce the debris entering the inside of the anti-siltation auxiliary pipe and reduce the possibility of pipeline blockage.

[0023] Usage method of a pressure type liquid level gauge applicable to easily silted environments and preventing backflow of external water:

[0024] Under normal working conditions:

[0025] At this time, there is no siltation or the siltation does not exceed the bottom of the pressure sensor, and the liquid level of the water body to be monitored does not exceed the air port of the controller. At this time, the working mode of the pressure type liquid level gauge is the same as that of a conventional pressure type liquid level gauge;

[0026] At this time, due to the narrow pores of the anti-siltation auxiliary pipe, less debris and finer particles enter the anti-siltation auxiliary pipe, and it will not cause blockage of the anti-siltation auxiliary pipe. If debris enters the anti-siltation auxiliary pipe, it will settle in the anti-siltation auxiliary pipe and finally enter the anti-siltation auxiliary bin, flowing out from the water permeable holes at the lower part of the anti-siltation auxiliary bin;

[0027] Under severely silted working conditions:

[0028] At this time, the siltation exceeds the pores at the bottom of the pressure sensor, resulting in the inability of the pressure sensor to be effectively connected to the water body to be monitored through the water permeable holes at the bottom. However, the pressure sensor can maintain close connection with the water body to be monitored through the anti-siltation auxiliary pipe, ensuring the normal operation and accurate numerical value of this pressure type liquid level gauge;

[0029] Due to external siltation, the water permeable holes at the lower part of the anti-siltation auxiliary bin are blocked. The anti-siltation auxiliary bin can store the debris that has settled from the anti-siltation auxiliary pipe, ensuring the normal operation and accurate numerical value of this pressure type liquid level gauge;

[0030] Under the flooded condition:

[0031] At this time, the water body to be monitored floods the air port of the controller, and even causes a certain amount of external water to enter the air port. Since the air chamber and the air port are set in an obliquely downward direction, the external water cannot directly backflow into the negative pressure chamber of the pressure sensor. As the water level of the water body to be monitored further rises, the external water enters the air chamber through the air port. The internal space of the air chamber is large. As the external water further enters the air chamber, the air pressure in the air chamber rises sharply, preventing the external water from further entering. After the water level of the water body to be monitored drops, the water in the air chamber and the air port automatically drains under the action of gravity, ensuring that this pressure type liquid level gauge can resume normal operation and the data information is accurate.

[0032] The present invention has the following beneficial effects:

[0033] 1. When the bottom of the pressure sensor of an ordinary pressure - type liquid level gauge is covered by sediment, as the sediment depth increases, the connection between the positive - pressure chamber of the pressure - sensing structure and the monitored water body weakens, resulting in inaccurate monitoring data of the pressure - type liquid level gauge or a large delay in data information when the liquid level of the monitored water body suddenly changes. By setting up an anti - sediment auxiliary chamber and an anti - sediment auxiliary pipe, the present invention can ensure that even under sediment conditions, the positive - pressure chamber of the pressure - sensing structure can still be effectively connected to the monitored water body, ensuring the accuracy and timeliness of the data information of this pressure - type liquid level gauge.

[0034] 2. At the same time, when the present invention realizes the functions of the above - mentioned ordinary pressure - type liquid level gauge, it has a simple structure, convenient operation, low cost, and maintains almost the same measurement range as the original pressure - type liquid level gauge.

[0035] 3. When the water level of the monitored water body suddenly rises and exceeds, sewage may back - flow from the air port into the air pipe connected to the negative - pressure chamber or even enter the negative - pressure chamber, resulting in inaccurate readings of the pressure - type liquid level gauge and the need for repair. Due to the setting of the air chamber and the air port in the present invention, after the air port of the controller is submerged or external water enters the air port and the air chamber, it can prevent further entry of external water through the internal air pressure. After the water level of the monitored water body drops, the water in the air chamber and the air port automatically drains, ensuring that this pressure - type liquid level gauge can automatically resume normal operation and the data information is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following further explains the present invention with reference to the drawings and embodiments.

[0037] Figure 1 It is a schematic diagram of the pressure - type liquid level gauge of the present invention.

[0038] Figure 2 For the present invention Figure 1 View a in

[0039] Figure 3 It is a schematic diagram of the use of this pressure - type liquid level gauge under normal operating conditions of the present invention.

[0040] Figure 4 It is a schematic diagram of the situation of this pressure - type liquid level gauge under the condition of relatively serious sedimentation of the present invention.

[0041] Figure 5 It is a schematic diagram of the situation of this pressure - type liquid level gauge under the condition of being submerged of the present invention.

[0042] In the figure: controller 1, waterproof conduit 2, pressure sensor 3;

[0043] Vent pipe 11, air chamber 12, air port 13, outer housing 14;

[0044] Pressure - sensing structure 31, anti - sediment auxiliary chamber 32, anti - sediment auxiliary pipe 33, permeable holes 34, pores 35. Detailed implementation manners

[0045] The following further describes the implementation manners of the present invention with reference to the accompanying drawings.

[0046] See Figure 1-2 , a pressure type liquid level gauge applicable to an easily silted environment and preventing backflow of external water, which includes a controller 1. The controller 1 is connected to a waterproof conduit 2, and the other end of the waterproof conduit 2 is connected to a pressure sensor 3. A signal amplifier and an analog-to-digital converter are arranged inside the controller 1, and the signal amplifier and the analog-to-digital converter are electrically connected to the controller. The signal amplifier is electrically connected to the pressure sensor 3 and is used to amplify the analog signal output by the pressure sensor 3. The analog-to-digital converter converts the amplified analog signal into a digital signal, and the controller converts the digital signal into a corresponding value and displays it through a display. In the present invention, an anti-silting auxiliary pipe and an anti-silting auxiliary bin are added to the lower part of the pressure type liquid level gauge to solve the problem of inaccurate or delayed values caused by siltation. The present invention reforms the air hole connecting the upper part of the pressure type liquid level gauge to the negative pressure chamber, so that even if water enters the air hole of the negative pressure chamber, it can be automatically emptied, avoiding the problem of inaccurate liquid level values caused by water entering the air hole of the negative pressure chamber, significantly prolonging the reliable monitoring period of the liquid level gauge, and reducing the maintenance frequency. During the specific use process, the monitored pressure signal is transmitted to the signal amplifier through the pressure sensor 3, the analog signal is transmitted to the analog-to-digital converter through the signal amplifier, the analog signal is converted into a digital signal through the analog-to-digital converter, and the digital signal is converted into a corresponding value through the controller.

[0047] Among them, the signal amplifier and the analog-to-digital converter can select general components on the market.

[0048] Further, the controller 1 includes an outer housing 14. The outer housing 14 adopts a sealed and water-impermeable structure. An air chamber 12 is arranged inside the outer housing 14. The air chamber 12 is arranged obliquely. The upper part of the air chamber 12 is connected to a ventilation pipe 11, and the ventilation pipe 11 is connected to the waterproof conduit 2. The lower part of the air chamber 12 is connected to an air port 13, and the air port 13 is arranged outside the outer housing 14. By adopting the obliquely arranged air chamber 12, it is ensured that when the water level of the monitored water body suddenly rises and exceeds, even if the air port 13 of the controller 1 is submerged or external water enters the air port 13 and the air chamber 12, the further entry of external water can be blocked by the internal air pressure. After the water level of the monitored water body drops, the water in the air chamber 12 and the air port 13 automatically drains out, ensuring that the pressure type liquid level gauge can automatically resume normal operation and the data information is accurate.

[0049] Further, the outer housing 14 is made of metal or plastic; the air chamber 12 is made of a transparent material and has a certain strength to ensure that it is not easily deformed by external forces. Through the above-mentioned air chamber 12, it is convenient for inspection and observation, and through the above-mentioned outer housing 14, the internal components can be effectively protected.

[0050] Furthermore, the diameter of the ventilation pipe 11 is the same as that of the waterproof conduit 2. The above-mentioned dimensional coordination facilitates the docking of the two.

[0051] Furthermore, the air port 13 is made of the same material as the ventilation pipe 11. The above-mentioned material facilitates the connection of the two.

[0052] Furthermore, the cross-sectional dimension of the air port 13 is larger than that of the ventilation pipe 11, ensuring that the external water in the air chamber 12 can automatically drain under the action of gravity.

[0053] Furthermore, the waterproof conduit 2 is a hollow watertight pipe, having a certain strength, not easily shriveled and deformed under external force extrusion, and made of metal, plastic or rubber according to needs.

[0054] Furthermore, the waterproof conduit 2 is in a straight non-bendable form or a bendable and coiled form. Through the above-mentioned external structure, its adaptability is enhanced.

[0055] Furthermore, the upper part of the waterproof conduit 2 is connected to the lower part of the controller 1 and is connected to the ventilation pipe 11, and the interface is sealed and watertight; the lower part of the waterproof conduit 2 is connected to the negative pressure chamber of the pressure sensor 3, and the interface is sealed and watertight. By transforming the air hole connecting the upper part of the pressure type liquid level gauge and the negative pressure chamber through the waterproof conduit 2, even if water enters the air hole of the negative pressure chamber, it can be automatically emptied, avoiding the problem of inaccurate liquid level values caused by water entering the air hole of the negative pressure chamber, significantly prolonging the reliable monitoring period of the liquid level gauge, and reducing the maintenance frequency.

[0056] Furthermore, the pressure sensor 3 consists of three parts: a pressure sensing structure 31 located in the upper part of the pressure sensor 3, an anti-silting auxiliary chamber 32 located in the lower part of the pressure sensor 3, and an anti-silting auxiliary pipe 33. The negative pressure chamber in the upper part of the pressure sensing structure 31 is connected to the waterproof conduit 2, and the interface is sealed and watertight. The positive pressure chamber in the lower part is connected to the anti-silting auxiliary chamber 32 through a certain number of water-permeable holes arranged at intervals. A certain number of water-permeable holes 34 are arranged at intervals in the lower part of the anti-silting auxiliary chamber 32. The upper side of the anti-silting auxiliary chamber 32 is connected to the anti-silting auxiliary pipe 33, and pores 35 are arranged at intervals on the anti-silting auxiliary pipe 33, making the inside and outside of the anti-silting auxiliary pipe 33 communicate with each other. By adding the anti-silting auxiliary pipe 33 and the anti-silting auxiliary chamber 32, the problem of inaccurate numerical values or delays caused by silting is well solved.

[0057] Furthermore, the pores 35 should not be too large and their width should be significantly smaller than the inner diameter of the anti-silting auxiliary pipe 33 to reduce the debris entering the inside of the anti-silting auxiliary pipe and reduce the possibility of pipeline blockage.

[0058] Furthermore, the anti-silting auxiliary bin 32 is made of corrosion-resistant material, has a certain strength and is not easily deformed.

[0059] Furthermore, the anti-silting auxiliary pipe 33 is made of corrosion-resistant metal, plastic or rubber material.

[0060] Furthermore, the width of the pore 35 is smaller than the inner diameter of the anti-silting auxiliary pipe 33 to reduce the sundries entering the interior of the anti-silting auxiliary pipe 33 and reduce the possibility of pipeline blockage.

[0061] Furthermore, the sundries are mainly mud and sand.

[0062] Embodiment 2:

[0063] Usage method of the pressure type liquid level gauge applicable to easily silted environment and preventing backflow of external water:

[0064] Refer to Figure 3 , under normal working conditions:

[0065] At this time, there is no siltation or the siltation does not exceed the bottom of the pressure sensor 3, and the liquid level of the water body to be monitored does not exceed the air port 13 of the controller 1. At this time, the working mode of the pressure type liquid level gauge is the same as that of the conventional pressure type liquid level gauge;

[0066] At this time, due to the narrow pore 35 of the anti-silting auxiliary pipe 33, there are few sundries and fine particles entering the anti-silting auxiliary pipe 33, which will not cause blockage of the anti-silting auxiliary pipe 33. If there are sundries entering the anti-silting auxiliary pipe 33, they will settle in the anti-silting auxiliary pipe 33 and finally flow out from the water permeable hole 34 at the lower part of the anti-silting auxiliary bin 32;

[0067] Embodiment 3:

[0068] Refer to Figure 4 , under the condition of serious siltation:

[0069] At this time, the siltation exceeds the pore 35 at the bottom of the pressure sensor 3, resulting in the inability of the pressure sensor 3 to be effectively connected to the water body to be monitored through the water permeable hole 34 at the bottom. However, the pressure sensor 3 can be closely connected to the water body to be monitored through the anti-silting auxiliary pipe 33 to ensure the normal operation and accurate numerical value of this pressure type liquid level gauge;

[0070] Due to external siltation, the water permeable hole 34 at the lower part of the anti-silting auxiliary bin 32 is blocked. The anti-silting auxiliary bin 32 can store the sundries settled from the anti-silting auxiliary pipe 33 to ensure the normal operation and accurate numerical value of this pressure type liquid level gauge;

[0071] Embodiment 4:

[0072] Refer to Figure 5 , under the flooded condition:

[0073] At this time, the air port 13 of the controller 1 is submerged by the water body to be monitored, and even a certain amount of external water enters the air port 13. Since the air chamber 12 and the air port 13 are arranged in an obliquely downward direction, the external water cannot directly backflow into the negative pressure chamber of the pressure sensor 3. As the water level of the water body to be monitored further rises, the external water enters the air chamber 12 through the air port 13. The internal space of the air chamber 12 is large. As the external water further enters the air chamber 12, the air pressure in the air chamber 12 rises sharply, preventing the external water from further entering. After the water level of the water body to be monitored drops, the water in the air chamber 12 and the air port 13 automatically drains under the action of gravity, ensuring that the pressure type liquid level gauge can resume normal operation and the data information is accurate.

Claims

1. Method of using a pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water. The pressure type liquid level gauge applicable to an environment prone to siltation and preventing backflow of external water includes a controller (1), the controller (1) is connected to a waterproof conduit (2), and the other end of the waterproof conduit (2) is connected to a pressure sensor (3); Inside the controller (1), a signal amplifier and an analog-to-digital converter are provided, and the signal amplifier and the analog-to-digital converter are electrically connected to the controller; The signal amplifier is electrically connected to the pressure sensor (3) and is used to amplify the analog signal output by the pressure sensor (3); The analog-to-digital converter converts the amplified analog signal into a digital signal, and the controller converts the digital signal into a corresponding value and displays it through a display; The controller (1) includes an outer casing (14), the outer casing (14) adopts a sealed and waterproof structure. Inside the outer casing (14), an air chamber (12) is provided. The air chamber (12) is arranged obliquely. The upper part of the air chamber (12) is connected to a ventilation pipe (11), the ventilation pipe (11) is connected to the waterproof conduit (2), and the lower part of the air chamber (12) is connected to an air port (13), and the air port (13) is arranged outside the outer casing (14); The pressure sensor (3) consists of three parts: a pressure sensing structure (31) located at the upper part of the pressure sensor (3), an anti-siltation auxiliary chamber (32) located at the lower part of the pressure sensor (3), and an anti-siltation auxiliary pipe (33); The negative pressure chamber at the upper part of the pressure sensing structure (31) is connected to the waterproof conduit (2), and the interface is sealed and waterproof. The positive pressure chamber at the lower part is communicated with the anti-siltation auxiliary chamber (32) through a certain number of water-permeable holes arranged at intervals. A certain number of water-permeable holes (34) are arranged at intervals at the lower part of the anti-siltation auxiliary chamber (32). The upper side of the anti-siltation auxiliary chamber (32) is connected to the anti-siltation auxiliary pipe (33), and pores (35) are arranged at intervals on the anti-siltation auxiliary pipe (33) so that the inside and outside of the anti-siltation auxiliary pipe (33) are communicated; It is characterized in that The said method of use: Under normal working conditions: At this time, there is no siltation or the siltation does not exceed the bottom of the pressure sensor (3), and the liquid level of the water body to be monitored does not exceed the air port (13) of the controller (1). At this time, the working mode of the pressure type liquid level gauge is the same as that of a conventional pressure type liquid level gauge; At this time, due to the narrow pores (35) of the anti-siltation auxiliary pipe (33), less debris and finer particles enter the anti-siltation auxiliary pipe (33), and it will not cause blockage of the anti-siltation auxiliary pipe (33). If debris enters the anti-siltation auxiliary pipe (33), it will settle in the anti-siltation auxiliary pipe (33) and finally enter the anti-siltation auxiliary chamber (32) and flow out from the water-permeable holes (34) at the lower part of the anti-siltation auxiliary chamber (32); Under severe siltation working conditions: At this time, the siltation exceeds the pores (35) at the bottom of the pressure sensor (3), resulting in the inability of the pressure sensor (3) to be effectively communicated with the water body to be monitored through the water-permeable holes at the bottom. However, the pressure sensor (3) can maintain close communication with the water body to be monitored through the anti-siltation auxiliary pipe (33), ensuring the normal operation and accurate numerical value of this pressure type liquid level gauge; Due to external siltation, the water-permeable holes (34) at the lower part of the anti-siltation auxiliary bin (32) are blocked. The anti-siltation auxiliary bin (32) can store the sundries that settle down from the anti-siltation auxiliary pipe (33), ensuring the normal operation and accurate numerical values of this pressure type liquid level gauge. Under the flooded condition: At this time, the air port (13) of the controller (1) is flooded by the monitored water body, and even a certain amount of external water enters the air port (13). Since the air chamber (12) and the air port (13) are arranged in an obliquely downward direction, the external water cannot directly backflow into the negative pressure chamber of the pressure sensor (3). As the water level of the monitored water body further rises, the external water enters the air chamber (12) through the air port (13). The internal space of the air chamber (12) is large. As the external water further enters the air chamber (12), the air pressure inside the air chamber (12) rises sharply, preventing the external water from further entering. After the water level of the monitored water body drops, the water in the air chamber (12) and the air port (13) automatically drains under the action of gravity, ensuring that this pressure type liquid level gauge can resume normal operation and the data information is accurate.

2. The usage method of the pressure type liquid level gauge applicable to an environment prone to siltation and preventing external water backflow according to claim 1, characterized in that: The outer housing (14) is made of metal or plastic material; The air chamber (12) is made of transparent material and has a certain strength to ensure that it is not easily deformed by external forces.

3. The usage method of the pressure type liquid level gauge applicable to an environment prone to siltation and preventing external water backflow according to claim 1, characterized in that: The diameter of the ventilation pipe (11) is the same as that of the waterproof conduit (2); The air port (13) is made of the same material as the ventilation pipe (11); The cross-sectional dimension of the air port (13) is larger than the cross-sectional dimension of the ventilation pipe (11), ensuring that the external water in the air chamber (12) can automatically drain under the action of gravity.

4. The usage method of the pressure type liquid level gauge applicable to an environment prone to siltation and preventing external water backflow according to claim 1, characterized in that: The waterproof conduit (2) is a hollow water-impermeable pipe with a certain strength, not easily shriveled and deformed under external force extrusion, and is made of metal, plastic or rubber materials as required; The waterproof conduit (2) is in a straight non-bendable type or a bendable and coiled type; The upper part of the waterproof conduit (2) is connected to the lower part of the controller (1) and is connected to the ventilation pipe (11), and the interface is sealed and water-impermeable; the lower part of the waterproof conduit (2) is connected to the negative pressure chamber of the pressure sensor (3), and the interface is sealed and water-impermeable.

5. The usage method of the pressure type liquid level gauge applicable to an environment prone to siltation and preventing external water backflow according to claim 1, characterized in that: The pore (35) should not be too large and its width should be significantly smaller than the inner diameter of the anti-siltation auxiliary pipe (33) to reduce the sundries entering the anti-siltation auxiliary pipe and reduce the possibility of pipeline blockage.

6. The usage method of the pressure type liquid level gauge applicable to an environment prone to siltation and preventing external water backflow according to claim 1, characterized in that: The anti-siltation auxiliary bin (32) is made of corrosion-resistant material, has a certain strength and is not easily deformed; The anti-siltation auxiliary pipe (33) is made of corrosion-resistant metal, plastic or rubber material; The width of the pore (35) is smaller than the inner diameter of the anti-silting auxiliary pipe (33) to reduce the debris entering the interior of the anti-silting auxiliary pipe (33) and lower the possibility of pipeline blockage.

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