Liquid level measuring device for low-level container

Abstract

The utility model relates to the technical field of liquid level measurement, in particular to a liquid level measuring device for a low-level container, which comprises a low-level liquid inlet pipe, an L-shaped bypass pipe, a first liquid passing pipe and a liquid level meter, one end of the low-position liquid inlet pipe is communicated to the bottom of the container; the communicating L-shaped bypass pipe and the first liquid pipe are respectively communicated with the other end of the low-position liquid inlet pipe; the L-shaped bypass pipe is vertically arranged, the higher end of the L-shaped bypass pipe is communicated to a liquid level measuring cavity of the liquid level meter, and the lower end of the L-shaped bypass pipe is communicated to the low-position liquid inlet pipe; the first liquid passing pipe and the low-position liquid inlet pipe are the same in height and are transversely arranged, and the two ends of the first liquid passing pipe are communicated to the bottom end of the liquid level measuring cavity and the low-position liquid inlet pipe respectively; according to the utility model, the liquid level measurement response is more timely when the liquid level of the container is low, so that measurement errors can be avoided; the deposition of slag or impurities can be reduced, and the blockage frequency of the bottom of the liquid level meter is reduced; and the use performance is better.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measurement, in particular to a liquid level measuring device for a low-level container. Background Art

[0002] Liquid level measurement is widely used in the field of tobacco equipment, and is increasingly used for measuring the liquid level of containers and tanks. For example, the condensate tank (water storage tank) of the tocopherol dryer is a device for recovering the condensate generated by the steam system of the entire tocopherol dryer without back pressure. The commonly used water level gauge for this type of container is a glass tube water level gauge. By setting a measurement switch or manual measurement at the high and low water level positions of the glass tube water level gauge, the glass tube of this type of water level gauge is dirty after long-term use, making it difficult to observe the water level; and the bottom surface of this type of low-level container is close to the ground, and the low-level liquid inlet needs to be connected to the bottom of the container to measure the low liquid level of the container. The commonly used low-level liquid inlet pipe is usually higher than the bottom, so the bottom of the commonly used liquid level gauge is installed below the ground, and the ground needs to be processed for installation, which is very inconvenient to install.

[0003] In order to solve the above-mentioned installation limitation problem, there is currently a liquid level measuring device that allows the bottom of the liquid level to be installed on the ground by setting a bypass pipe higher than the bottom surface to feed liquid into the liquid level measuring cavity. Although this type of liquid level meter can be easily installed above the ground, since the higher end of the bypass pipe is higher than the bottom by a certain distance, there is a vertical pipe at the bottom of the liquid level meter where liquid cannot flow, resulting in the inability to measure the liquid level in time when the liquid level in the container is lower than the height of the bypass pipe; and, since the liquid in the section of the liquid level meter that is lower than the highest end of the bypass pipe cannot flow, it is easy for slag or impurities to deposit at the bottom of the liquid level meter. When the liquid level is low, the float will often be blocked at the bottom of the liquid level meter, resulting in measurement failure and measurement errors. Utility Model Content

[0004] The utility model aims to provide a liquid level measuring device for a low-level container, which is aimed at the problem that the bypass pipe of the liquid level gauge in the prior art is higher than the bottom of the liquid level gauge by a certain distance, so that the liquid level in the container cannot be measured in time when the liquid level is lower than the bypass pipe, or slag or impurities are easily deposited, resulting in measurement failure or liquid level measurement error. The utility model comprises: a low-level liquid inlet pipe, an L-shaped bypass pipe, a first liquid-passing pipe and a liquid level gauge; one end of the low-level liquid inlet pipe is used to be connected to the bottom of the container; the L-shaped bypass pipe and the first liquid-passing pipe are respectively connected to the other end of the low-level liquid inlet pipe; the L-shaped bypass pipe is vertically arranged, the higher end of the L-shaped bypass pipe is connected to the liquid level measurement cavity of the liquid level gauge, and the lower end of the L-shaped bypass pipe is connected to the low-level liquid inlet pipe; the first liquid-passing pipe and the low-level liquid inlet pipe are at the same height and are arranged horizontally, and the two ends of the first liquid-passing pipe are respectively connected to the bottom end of the liquid level measurement cavity and the low-level liquid inlet pipe; the first liquid-passing pipe is provided with a sewage outlet.

[0005] The solution of the utility model is to set an L-shaped bypass pipe and a first liquid-passing pipe, and make both of them connected to the low-position liquid inlet pipe, and then set the L-shaped bypass pipe vertically, and the first liquid-passing pipe and the low-position liquid inlet pipe are at the same height and are arranged horizontally, so that when the liquid level in the container is lower than the height of the L-shaped bypass pipe, the liquid in the container can flow through the low-position liquid inlet pipe and the first liquid-passing pipe, and then flow into the liquid level measurement cavity, and the float can start to float up when the liquid level is lower than the L-shaped bypass pipe, so that the liquid level measurement response is more timely, and measurement errors or failure to measure in time are avoided. When a low liquid level is measured, a situation occurs; and, through the first liquid-passing pipe, the liquid at the bottom of the level gauge can flow back from the first liquid-passing pipe to the low-level liquid inlet pipe, so that the liquid at the bottom of the level gauge cavity can be in a flowing state, reducing the deposition of slag or impurities, thereby reducing the frequency of blockage at the bottom of the level gauge; when the liquid level in the container is higher than the L-shaped bypass pipe, it can flow into the level gauge from the L-shaped bypass pipe, even if the first liquid-passing pipe is blocked, it will not affect the level gauge's measurement of the liquid level of the container that is higher than the highest end of the L-shaped bypass pipe, thereby improving the performance of the measuring device.

[0006] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the first liquid pipe is an inverted T-shaped pipe, and one vertical end of the first liquid pipe is connected to the bottom end of the liquid level measuring cavity; one transverse end of the first liquid pipe is connected to the low-level liquid inlet pipe, and the other transverse end of the first liquid pipe forms a first sewage pipe.

[0007] As a preferred embodiment of the present invention, the first liquid-passing pipe is an inverted T-shaped pipe, with one horizontal end and one vertical end connected to each other, and can provide circulating measuring liquid for the liquid level gauge. Even if slag or impurities are deposited at the bottom of the liquid level gauge, the liquid pressure at the vertical end is less than the pressure of the horizontal pipe, and the horizontal pipe has lower fluidity than the vertical pipe. Since slag or impurities are usually deposited in pipes with lower flow rates, this arrangement allows the slag or impurities to be deposited as much as possible in the first horizontal liquid-passing pipe, increasing the deposition area and further reducing the possibility of blockage. Furthermore, by forming a first drain pipe at the other horizontal end of the first liquid-passing pipe, even if slag or impurities are deposited at the bottom of the liquid level gauge, the flow rate at the end of the first drain pipe is the smallest, and the slag or impurities are usually deposited at the first drain pipe position, and the slag or impurities can be discharged in time through the first drain pipe, further improving the anti-blocking performance of the liquid level measuring device, facilitating the discharge of slag or impurities and maintenance, and optimizing the use function.

[0008] Preferably, in the liquid level measuring device for a low-level container described in the utility model, a second sewage pipe is provided at a position of the first liquid passage away from the liquid level measuring chamber; and the second sewage pipe is provided with a filter.

[0009] As a preferred solution of the utility model, a second sewage pipe is arranged at a position of the first liquid passing pipe away from the liquid level measuring chamber. Since the second sewage pipe has a path for liquid to flow through, liquid with more slag or impurities can be deposited in the second sewage pipe, reducing the deposition of slag or impurities at the bottom of the first liquid passing pipe and the liquid level measuring chamber, further reducing the probability of blockage; and, a filter is arranged in the second sewage pipe to discharge water filtered out of harmful substances from the second sewage pipe to avoid sewage discharge. The filtered water can be continuously discharged outward through the second sewage pipe, thereby eliminating the need for manual sewage collection, saving labor costs, and improving production efficiency.

[0010] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the second sewage pipe is arranged at the portion of the first liquid passage pipe located between the L-shaped bypass pipe and the liquid level measuring chamber.

[0011] As a preferred solution of the utility model, by arranging the second sewage pipe between the L-shaped bypass pipe and the liquid level measuring chamber, since the L-shaped bypass pipe can be at a high liquid level, slag or impurity deposition is not easy to occur, while the first liquid flow pipe is horizontal and is in a low liquid level flow path, slag or impurity deposition is easy to occur. On the one hand, the efficiency of collecting slag or impurities by the second sewage pipe is made higher, and on the other hand, an on-off valve can be provided between the L-shaped bypass pipe and the second sewage pipe. The maintenance process of the second sewage pipe for sewage discharge or filter replacement will not affect the on-off of the L-shaped bypass pipe, and the liquid level measuring device can be kept working, thereby enhancing the applicability of the liquid level measuring device.

[0012] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the angle between the second sewage pipe and the first liquid passage pipe is an acute angle.

[0013] As a preferred solution of the utility model, by setting the second sewage pipe at an acute angle with the first liquid passing pipe, since the flow direction of the liquid in the first liquid passing pipe is horizontal, the liquid flowing toward the liquid level measuring chamber can more easily enter the second sewage pipe in the flow direction, so that more liquid in the first liquid passing pipe can be intercepted by the second sewage pipe, and then circulate in the first liquid passing pipe after passing through the second sewage pipe, thereby enhancing the filtering effect of the liquid in the first liquid passing pipe and further reducing the risk of blockage of the liquid level measuring chamber.

[0014] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the L-shaped bypass pipe comprises: a curved pipe section and a straight pipe section; the curved pipe section is a right-angle bend; the curved pipe section is connected to the first liquid-passing pipe through a first flexible joint; one end of the straight pipe section is connected to the curved pipe section through a second flexible joint, and the other end of the straight pipe section is connected to the liquid level measuring chamber.

[0015] As a preferred solution of the utility model, by configuring the L-shaped bypass pipe to be a split L-shaped bypass pipe, the first joint and the second joint can be disassembled during maintenance or inspection, so that both ends of the curved pipe section and the straight pipe section can be viewed, which is convenient for unblocking blockages and checking the location of blockages, and also facilitates the alignment of the joint position during installation, improves the sealing performance during installation, thereby facilitating installation, inspection and maintenance, and further improving the performance of the liquid level measuring device.

[0016] Preferably, the liquid level measuring device for a low-level container described in the utility model comprises a high-level connecting pipe located above the low-level liquid inlet pipe; both ends of the high-level connecting pipe are respectively connected to the top of the container and the liquid level measuring cavity.

[0017] As a preferred embodiment of the present invention, pressure vessels also require liquid level measurement. The pressure vessel is not connected to the atmosphere and is a closed container. According to the communicating vessel principle, the upper part of the container and the upper part of the liquid level measuring cavity are filled with air, and the lower part of the container and the lower part of the liquid level measuring cavity are filled with liquid. By setting a high-level communicating pipe, the liquid in the container flows through the liquid level measuring cavity, and the gas in the liquid level measuring cavity flows to the container, thereby keeping the pressure vessel and the liquid level measuring cavity in a flowing state, so that the liquid level measuring device can be used for liquid level measurement of pressure vessels, thereby broadening the scope of application of the liquid level measuring device.

[0018] Preferably, in the liquid level measuring device for a low-level container described in the utility model, one end of the high-level connecting pipe connected to the liquid level measuring cavity is higher than the end connected to the top of the container.

[0019] As a preferred solution of the utility model, by setting one end of the high-level connecting pipe connected to the liquid level measuring cavity higher and the other end connected to the top of the container lower, according to the connecting vessel principle, the highest liquid level in the container is always lower than the top of the liquid level measuring cavity, and the liquid level in the liquid level measuring cavity is lower than or equal to the height of the high-level connecting pipe, thereby avoiding the liquid level in the liquid level measuring cavity being higher than the measuring range, further reducing the risk of damage to the liquid level measuring device due to the liquid level exceeding the measuring range, and enhancing the durability of the liquid level measuring device.

[0020] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the liquid level meter is a magnetic flap liquid level meter; a plurality of sensors with different heights are provided in the liquid level measuring chamber; the positions of the plurality of sensors are higher than the height of the L-shaped bypass pipe; the sensor electrical signal is connected to a control system, and the control system is used to receive the sensor signal and display the height of the liquid level.

[0021] As a preferred solution of the utility model, by arranging multiple sensors in the liquid level measuring chamber, the position of the float in the liquid level measuring chamber can be measured, and the signal can be transmitted to the control system through an electrical signal connection. By monitoring the liquid level height fed back by the control system, the staff can make timely adjustments and perform regular discharges to avoid safety accidents caused by the liquid level in the container exceeding the maximum liquid level, thereby further improving the safety performance of the liquid level measuring device.

[0022] Preferably, in the liquid level measuring device for a low-level container described in the utility model, the low-level liquid inlet pipe is provided with a second valve.

[0023] As a preferred solution of the utility model, by providing a second valve in the low-level liquid inlet pipe, the circulation of the liquid in the low-level liquid inlet pipe can be cut off or reduced. When maintenance or sewage discharge is required, the circulation of the liquid in the low-level liquid inlet pipe can be cut off to avoid sewage discharge, which is convenient for maintenance. The flow rate of the liquid in the liquid inlet pipe can also be reduced, which is conducive to adjusting the working conditions of the liquid level measuring device according to actual conditions and further improving the applicability of the liquid level measuring device.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0025] 1. By setting the L-shaped bypass pipe and the first liquid-passing pipe, when the liquid level in the container is lower than the height of the L-shaped bypass pipe, the liquid in the container can flow through the low-level liquid inlet pipe, through the first liquid-passing pipe, and then flow into the liquid level measurement chamber. The float can start to float up when the liquid level is lower than the L-shaped bypass pipe, so that the liquid level measurement response is more timely, avoiding measurement errors or failure to measure the low liquid level in time;

[0026] 2. By setting the first liquid-passing pipe, the liquid at the bottom of the liquid level gauge can flow back from the first liquid-passing pipe to the low-level liquid inlet pipe, so that the liquid at the bottom of the liquid level gauge cavity can be in a flowing state, reducing the deposition of slag or impurities, thereby reducing the frequency of blockage at the bottom of the liquid level gauge; when the liquid level in the container is higher than the L-shaped bypass pipe, it can flow into the liquid level gauge from the L-shaped bypass pipe. Even if the first liquid-passing pipe is blocked, it will not affect the liquid level gauge's measurement of the liquid level of the container higher than the highest end of the L-shaped bypass pipe, thereby improving the performance of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0028] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0029] Icons: 1. Low-level liquid inlet pipe; 11. Second valve; 2. L-shaped bypass pipe; 21. Bend section; 211. First joint; 22. Straight section; 222. Second joint; 3. First liquid pipe; 4. Liquid level gauge; 41. Liquid level measuring chamber; 42. Sensor; 43. Float; 5. First sewage pipe; 6. Second sewage pipe; 61. Filter; 62. First valve; 7. High-level connecting pipe. DETAILED DESCRIPTION

[0030] The utility model is described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] Example 1

[0033] like Figure 1 As shown, the utility model is a liquid level measuring device for a low-level container, comprising: a low-level liquid inlet pipe 1, an L-shaped bypass pipe 2, a first liquid pipe 3 and a liquid level gauge 4; one end of the low-level liquid inlet pipe 1 is used to be connected to the bottom of the container; the L-shaped bypass pipe 2 and the first liquid pipe 3 are respectively connected to the other end of the low-level liquid inlet pipe 1, the higher end of the L-shaped bypass pipe 2 is connected to the liquid level measuring cavity 41 of the liquid level gauge 4, and the lower end of the L-shaped bypass pipe 2 is connected to the low-level liquid inlet pipe 1; the first liquid pipe 3 and the low-level liquid inlet pipe 1 are at the same height and are arranged horizontally, and the two ends of the first liquid pipe 3 are respectively connected to the bottom end of the liquid level measuring cavity 41 and the low-level liquid inlet pipe 1; the first liquid pipe 3 is provided with a sewage outlet.

[0034] Specifically, Figure 1 As shown, the low-level liquid inlet pipe 1 of the liquid level measuring device and the low-level connecting pipe of the container or tank can be at the same horizontal position, with a large distance from the ground or the mounting platform, and there will be no installation difficulties, so that the entire liquid level measuring device can be installed in more low-level installation conditions.

[0035] It should be noted that the sewage outlet can be arranged at the side of the first liquid pipe 3, for example, at the end of the first liquid pipe 3 close to one end of the liquid level measurement chamber 41, and a valve is arranged at the end, and the sewage of the first liquid pipe 3 can be discharged by opening the valve. Figure 1 and Figure 2 No more details will be shown in the following; Figure 1As shown, the first liquid pipe 3 is an inverted T-shaped pipe, and one vertical end of the first liquid pipe 3 is connected to the bottom end of the liquid level measuring chamber 41; one horizontal end of the first liquid pipe 3 is connected to the low-position liquid inlet pipe 1, and the other horizontal end of the first liquid pipe 3 forms a first sewage discharge pipe 5; through the setting of the inverted T-shaped pipe, on the one hand, the three-way connection function of the first liquid pipe 3 is met, and on the other hand, the bottom of the liquid level measuring chamber 41 is subjected to the vertical pressure of the liquid to be the position where the liquid flow rate is the largest, thereby avoiding the deposition of slag or impurities at the bottom of the liquid level measuring chamber 41.

[0036] Specifically, the first liquid-passing pipe 3 is provided with a second drain pipe 6 at a position away from the liquid level measuring chamber 41; the second drain pipe 6 is provided with a filter 61; it should be noted that, since the first liquid-passing pipe 3 is provided to pass liquid in a horizontal direction, the second drain pipe 6 can be provided horizontally, which can prevent a large amount of liquid from accumulating in the second drain pipe 6 at a low level; Figure 1 As shown, the second sewage pipe 6 can be preferably arranged at a section of the first liquid pipe 3 between the L-shaped bypass pipe 2 and the liquid level measurement chamber 41; it can also be preferred that the angle between the second sewage pipe 6 and the first liquid pipe 3 is an acute angle, for example Figure 1 As shown, the second sewage pipe 6 and the end of the first liquid passage 3 close to the liquid level detection chamber form an angle ranging from 45° to 60°.

[0037] Specifically, Figure 2 As shown, by setting a filter 61, a filter screen is installed inside the filter 61, and a discharge port is provided at the rear end of the filter 61. A first valve 62 can be provided at the rear end of the second sewage pipe 6 located at the filter 61. The first valve 62 can realize timely discharge of slag or impurities deposited in the liquid by opening the first valve 62 without disassembling the filter 61. The first valve 62 is in a closed state during the use of the liquid level measuring device; according to the degree of cleanliness of the liquid, the first valve 62 can be selected as a manual valve or an automatic valve. When it is a manual valve, it can be discharged regularly to keep the first liquid pipe 3 unobstructed. When it is an automatic valve, it can be discharged regularly through the control system or at the beginning of the equipment operation, the first valve 62 is opened to discharge impurities for a period of time and then closed to keep the first liquid pipe 3 unobstructed; even in special circumstances, if the filter 61 is blocked, the liquid can enter the liquid level measuring chamber 41 through the L-shaped bypass pipe 2, and the liquid level measuring device will not be unusable.

[0038] Specifically, the L-shaped bypass pipe 2 includes: a curved pipe section 21 and a straight pipe section 22; the curved pipe section 21 is a right-angle bend; the curved pipe section 21 is connected to the first liquid pipe 3 through a first flexible joint 211; one end of the straight pipe section 22 is connected to the curved pipe section 21 through a second flexible joint 222, and the other end of the straight pipe section 22 is connected to the liquid level measuring chamber 41.

[0039] It should be noted that the first flexible joint 211 and the second flexible joint 222 are professional terms for pipe fittings, which are understood to be components that can be sealed and connected to the pipe wall of the pipe through threads at both ends and make the pipes interconnected. Specifically, the L-shaped bypass pipe 2 can be a 304 stainless steel pipe with a diameter of 60.3 mm and a thickness of 2 mm, with a pressure resistance of up to 4.0 MPa and a temperature resistance of up to 450°C.

[0040] In this embodiment, the liquid level measuring device for a low-level container further includes a high-level connecting pipe 7 located above the low-level liquid inlet pipe 1; both ends of the high-level connecting pipe 7 are respectively connected to the top of the container and the liquid level measuring chamber 41.

[0041] Specifically, one end of the high-level connecting pipe 7 connected to the liquid level measuring chamber 41 is higher than the end connected to the top of the container.

[0042] In this embodiment, specifically, the liquid level meter 4 is a magnetic flap liquid level meter 4; a plurality of sensors 42 of different heights are arranged in the liquid level measurement chamber 41; the positions of the plurality of sensors 42 are all higher than the height of the L-shaped bypass pipe 2; the electrical signals of the sensors 42 are connected to the control system, and the control system is used to receive the signals of the sensors 42 and display the height of the liquid level. Specifically, the low-level liquid inlet pipe 1 is provided with a second valve 11.

[0043] The liquid level measuring chamber 41 is connected to the high-position pipe and the low-position pipe of the container or tank through the high-position connecting pipe 7 and the low-position liquid inlet pipe 1, respectively. The high-position pipe and the low-position pipe are respectively located at the top and the bottom of the container or tank. The float 43 inside the liquid level measuring chamber 41 of the liquid level meter 4 has a built-in magnetic steel, which is used to cooperate with the liquid level meter 4 to measure the liquid level; the float 43 with the built-in magnetic steel floats up through the liquid in the liquid level measuring chamber 41 and is located at different positions of the liquid level measuring chamber 41. Through the magnetic cooperation, the height of the liquid level can be displayed on the magnetic flip column, so that the liquid level can be measured without clear Indicates the liquid level in the tank; specifically, the float 43 or the float ball can be 52 in diameter and 200 mm in length, made of 316L stainless steel, with a temperature resistance of up to 200°C; the sensor 42 can be a magnetostrictive liquid level sensor 42, which can transmit an analog signal of the liquid level height to the control system according to the built-in magnetic steel of the float 43, and the liquid level status can be observed manually through the magnetic flip column, and the magnetic flip column is not connected to the bypass pipe and the condensate tank, thereby avoiding the safety risk of leakage, and the entire liquid level measuring device is more sturdy and durable.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid level measuring device for a low-level container, characterized in that: include: A low-position liquid inlet pipe (1), an L-shaped bypass pipe (2), a first liquid passage pipe (3) and a liquid level gauge (4); one end of the low-position liquid inlet pipe (1) is used to be connected to the bottom of the container; the L-shaped bypass pipe (2) and the first liquid passage pipe (3) are respectively connected to the other end of the low-position liquid inlet pipe (1); the L-shaped bypass pipe (2) is arranged vertically, the higher end of the L-shaped bypass pipe (2) is connected to the liquid level measurement chamber (41) of the liquid level gauge (4), and the lower end of the L-shaped bypass pipe (2) is connected to the low-position liquid inlet pipe (1); the first liquid passage pipe (3) and the low-position liquid inlet pipe (1) are at the same height and are arranged horizontally, and the two ends of the first liquid passage pipe (3) are respectively connected to the bottom end of the liquid level measurement chamber (41) and the low-position liquid inlet pipe (1); the first liquid passage pipe (3) is provided with a sewage outlet.

2. The liquid level measuring device for a low-level container according to claim 1, characterized in that: The first liquid passage pipe (3) is an inverted T-shaped pipe, one vertical end of the first liquid passage pipe (3) is connected to the bottom end of the liquid level measuring chamber (41); one horizontal end of the first liquid passage pipe (3) is connected to the low-position liquid inlet pipe (1), and the other horizontal end of the first liquid passage pipe (3) forms a first sewage discharge pipe (5).

3. The liquid level measuring device for a low-level container according to claim 1, characterized in that: A second sewage discharge pipe (6) is provided at a position of the first liquid passage pipe (3) away from the liquid level measurement chamber (41); the second sewage discharge pipe (6) is provided with a filter (61).

4. The liquid level measuring device for a low-level container according to claim 3, characterized in that: The second sewage discharge pipe (6) is arranged at a portion of the first liquid passage pipe (3) located between the L-shaped bypass pipe (2) and the liquid level measurement chamber (41).

5. The liquid level measuring device for a low-level container according to claim 3, characterized in that: The included angle between the second sewage discharge pipe (6) and the first liquid passage pipe (3) is an acute angle.

6. The liquid level measuring device for a low-level container according to claim 1, characterized in that: The L-shaped bypass pipe (2) comprises: a curved pipe section (21) and a straight pipe section (22); the curved pipe section (21) is a right-angle bend; the curved pipe section (21) is connected to the first liquid-passing pipe (3) via a first flexible joint (211); one end of the straight pipe section (22) is connected to the curved pipe section (21) via a second flexible joint (222), and the other end of the straight pipe section (22) is connected to the liquid level measuring chamber (41).

7. The liquid level measuring device for a low-level container according to any one of claims 1 to 6, characterized in that: It comprises a high-position connecting pipe (7) located above the low-position liquid inlet pipe (1); two ends of the high-position connecting pipe (7) are respectively connected to the top of the container and the liquid level measuring chamber (41).

8. The liquid level measuring device for a low-level container according to claim 7, characterized in that: One end of the high-level connecting pipe (7) connected to the liquid level measuring chamber (41) is higher than the end connected to the top of the container.

9. The liquid level measuring device for a low-level container according to any one of claims 1 to 6, characterized in that: The liquid level meter (4) is a magnetic flap liquid level meter (4); a plurality of sensors (42) of different heights are arranged in the liquid level measurement cavity (41); the sensors (42) are used to cooperate with the float (43) of the liquid level meter to measure the liquid level height in the corresponding liquid level measurement cavity; the electrical signal of the sensor (42) is connected to a control system; the control system is used to receive the signal of the sensor (42) and display the liquid level height.

10. The liquid level measuring device for a low-level container according to any one of claims 1 to 6, characterized in that: The low-position liquid inlet pipe (1) is provided with a second valve (11).

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