Intelligent weighing type liquid level meter and medium liquid level and density measuring method thereof

Abstract

The invention discloses an intelligent weighing type liquid level meter and a medium liquid level and density measuring method thereof.The intelligent weighing type liquid level meter comprises a perforated pipe shell, a weighing sensor, a weighing transmitter, an acquisition communication terminal, a sinking body and a power supply module, and the weighing sensor is installed on the inner side of the top of the perforated pipe shell and electrically connected with the weighing transmitter; the sinking body is hung on the weighing sensor through a flexible wire, the weighing transmitter is electrically connected with the acquisition communication terminal, and the power supply module supplies power to the weighing sensor, the weighing transmitter and the acquisition communication terminal. According to the invention, accurate liquid level monitoring of the to-be-measured liquid under the condition of unknown density or variable density can be realized, and the method can be applied to complex scenes such as the industry with variable solute concentration and the water conservancy industry with complex river sediment conditions, and has relatively high popularization and application values.

Description

Technical Field

[0001] The invention relates to the field of agricultural environment monitoring, and in particular to an intelligent weighing liquid level meter and a measuring method thereof. Background Art

[0002] Liquid level monitoring is one of the most common needs in various fields such as industry, environment, hydrology, water conservancy, agriculture, etc. Liquid level meters are mainly divided into non-contact and contact types based on the measurement form. Non-contact types mainly include laser level meters, radar wave level meters, ultrasonic level meters, etc. The advantage of these level meters is that they are not affected by changes in liquid density, but laser level meters require reflectors for most liquids. Radar wave level meters generally have larger beams and are difficult to adapt to measurements in narrow spaces. The measurement accuracy of ultrasonic level meters is greatly affected by air temperature and humidity. Among the contact level gauges, the most commonly used ones are float type, magnetic flap, pressure type and other forms. The float type uses an encoder motor to drag the float ball to contact the liquid surface, which can achieve accurate measurement, but there are more moving parts and high power consumption. The magnetic flap type has poor resolution. The pressure type generally has low power consumption and high accuracy, but with the increase of years, it is easy to cause clogging and drift. The biggest problem is that the core principle of the pressure level gauge to measure the liquid level is P = ρgH, which is closely related to the density of the measured liquid. It is only suitable for liquids with known and constant density. It is difficult to cope with the changes in the density of the measured liquid caused by factors such as changes in the solute concentration of the measured liquid in industrial scenarios and changes in river sediment in the water conservancy industry. In addition, the current costs of the above-mentioned types of level gauges are generally high, which is not conducive to the promotion of liquid level monitoring. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an intelligent weighing level meter and a measuring method thereof which can accurately measure the liquid level and simultaneously measure the density of the measured liquid.

[0004] Technical solution: An intelligent weighing liquid level meter of the present invention includes a porous tube shell, a weighing sensor, a weighing transmitter, a data collection and communication terminal, a sinker, and a power supply module. The weighing sensor is installed on the inner side of the top of the porous tube shell, the weighing sensor is electrically connected to the weighing transmitter, the weighing transmitter is electrically connected to the data collection and communication terminal, the sinker is suspended on the weighing sensor, and the power supply module supplies power to the weighing transmitter and the data collection and communication terminal.

[0005] Furthermore, the outside of the porous tube shell is wrapped with a geotextile that is permeable to water but impermeable to mud and sand.

[0006] Furthermore, the sinker is suspended on a weighing sensor via a flexible wire.

[0007] Furthermore, the density of the sinker is greater than that of the liquid medium being measured.

[0008] Furthermore, a plurality of liquid level sensing modules are axially arranged on the sinker, and the liquid level sensing modules are electrically connected to the data collection and communication terminal.

[0009] Furthermore, the connection line between the liquid level sensing module and the acquisition communication terminal is a multi-strand soft wire that suspends a sinker on the weighing sensor.

[0010] A method for measuring liquid level and density of a medium based on an intelligent weighing liquid level meter, using the intelligent weighing liquid level meter as described above, specifically comprises the following steps:

[0011] S1: Install the intelligent weighing level meter in the medium of the liquid level to be measured. The radius of the sinker is r, the mass is W0, the material density is ρ0, the distance between any two liquid level sensing modules is L, the medium density of the liquid level to be measured is ρ1, and the sinker material density ρ0> the medium density ρ1;

[0012] S2: The collection communication terminal collects the weight of the sinker and the situation of the liquid level sensing module being submerged by the medium through the weighing transmitter and the liquid level sensing module. The height of the liquid level sensing module on the sinker is set to U1, U2, ..., U n ;

[0013] S3: When the medium density ρ1 is set to be known, the acquisition communication terminal collects the status of each liquid level sensing module and the weighing transmitter data W in real time. At this time, the real-time medium liquid level H is calculated as follows:

[0014] H=(W0-W) / ρ1 / (π· r 2 ) (1)

[0015] S4: When the medium density ρ1 is unknown or changes during the monitoring process, when the medium liquid surface passes through two consecutive liquid level sensing modules, the current liquid density can be measured in combination with the weighing change ΔW in the corresponding period. The liquid density calculation method is:

[0016]

[0017] Then, by substituting ρ1 into formula (1), the medium level can be calculated.

[0018] Furthermore, in S3, the data acquisition and communication terminal calculates the liquid level change according to the collected state of the liquid level sensing module to form a series of discrete liquid level data with a resolution of L. Based on this, the real-time liquid level data calculated by weighing is corrected. When the deviation of the liquid level change measured by the liquid level sensing module and the weighing sensor in the same period is greater than the set deviation threshold, it indicates that there is a fault in the system and the data acquisition and communication terminal will sound an alarm.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following advantages: the present invention realizes accurate measurement of liquid level by combining a weighing sensor with a liquid level sensing module, and can simultaneously measure the density of the liquid to be measured, and is particularly suitable for complex liquid level measurement under changes in the density of the liquid to be measured caused by factors such as changes in the solute concentration of the liquid to be measured and changes in river sediment in the water conservancy industry in industrial scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the weighing liquid level meter of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0022] An intelligent weighing liquid level meter and a measuring method thereof according to the present invention are as follows: Figure 1 As shown, it includes a porous tube shell 1, a weighing sensor 2, a weighing transmitter 3, a data acquisition and communication terminal 4, a sinker 5, and a power supply module 6. The weighing sensor 2 is installed on the inner side of the top of the porous tube shell 1, the weighing sensor 2 is electrically connected to the weighing transmitter 3, the weighing transmitter 3 is electrically connected to the data acquisition and communication terminal 4, the sinker 5 is suspended on the weighing sensor 2 through a soft wire, and the power supply module 6 is electrically connected to the weighing transmitter 2, the weighing transmitter 3, and the data acquisition and communication terminal 4.

[0023] In some embodiments, in order to prevent sediment accumulation during liquid level monitoring from affecting the liquid level measurement result, the porous tube shell 1 is wrapped with a geotextile 7 that is permeable to water but not permeable to sediment.

[0024] In some embodiments, to ensure that the sinker can be smoothly immersed in the liquid to be measured, the density of the sinker 5 is greater than the liquid medium to be measured.

[0025] In some embodiments, in order to correct the measurement error caused by weighing type real-time measurement of liquid level, and to realize accurate measurement of liquid level when the density of the liquid to be measured changes or is unknown, a plurality of liquid level sensing modules 8 are axially arranged on the sinker 5, and the liquid level sensing modules 8 are electrically connected to the acquisition communication terminal 4. Among them, the connection line between the liquid level sensing module 8 and the acquisition communication terminal 4 is a plurality of soft wires that suspend the sinker 5 on the weighing sensor 2.

[0026] A method for measuring liquid level and density of a medium based on an intelligent weighing liquid level meter specifically comprises the following steps:

[0027] S1: Install the intelligent weighing level meter in the medium of the liquid level to be measured. The radius of the sinker is r, the mass is W0, the material density is ρ0, the distance between any two liquid level sensing modules is L, and the density of the medium of the liquid level to be measured is ρ1;

[0028] S2: The communication terminal collects the weight of the sinker and the situation of the liquid level sensing module being submerged by the medium through the weighing transmitter and the liquid level sensing module. The height of the liquid level sensing module on the sinker is set to U1, U2, ..., U n ;

[0029] S3: When the medium density ρ1 is set to be known, the acquisition communication terminal collects the status of each liquid level sensing module and the weighing transmitter data W in real time. At this time, the real-time medium liquid level H is calculated as follows:

[0030] H=(W0-W) / ρ1 / (π·r 2 ) (1) S: When the medium density ρ1 is unknown or changes during the monitoring process, when the medium liquid surface passes through two consecutive liquid level sensing modules, the current liquid density can be measured in combination with the weighing change ΔW in the corresponding period. The liquid density calculation method is:

[0031]

[0032] Then, by substituting ρ1 into formula (1), the medium level can be calculated.

[0033] In some embodiments, the data collection and communication terminal calculates the liquid level change according to the collected status of the liquid level sensing module to form a series of discrete liquid level data with a resolution of L. Based on this, the real-time liquid level data calculated by weighing is corrected. When the deviation of the liquid level change measured by the liquid level sensing module and the weighing sensor in the same period is greater than the set deviation threshold, it indicates that there is a fault in the system and the data collection and communication terminal will alarm.

Claims

1. An intelligent weighing liquid level meter, characterized in that: The invention comprises a porous tube shell (1), a weighing sensor (2), a weighing transmitter (3), a data acquisition and communication terminal (4), a sinker (5), and a power supply module (6); the weighing sensor (2) is mounted on the inner side of the top of the porous tube shell (1); the weighing sensor (3) is electrically connected to the weighing transmitter (3); the weighing transmitter (3) is electrically connected to the data acquisition and communication terminal (4); the sinker (5) is suspended on the weighing sensor (2); and the power supply module (6) supplies power to the weighing transmitter (3) and the data acquisition and communication terminal (4).

2. The weighing level gauge according to claim 1, characterized in that: The porous tube shell is wrapped with a geotextile (7) that is permeable to water but not permeable to mud and sand.

3. The weighing level gauge according to claim 1, characterized in that: The sinker (5) is suspended on the weighing sensor (2) via a flexible wire.

4. The weighing level meter according to claim 1, characterized in that: The density of the sinker (5) is greater than that of the liquid medium to be measured.

5. The weighing liquid level meter according to claim 1, characterized in that: A plurality of liquid level sensing modules (8) are axially arranged on the sinker (5), and the liquid level sensing modules (8) are electrically connected to the data collection and communication terminal (4).

6. The weighing level meter according to claim 5, characterized in that: The connection line between the liquid level sensing module (8) and the data acquisition communication terminal (4) is a multi-strand soft wire that suspends the sinker (5) on the weighing sensor (2).

7. A method for measuring liquid level and density of a medium based on an intelligent weighing liquid level meter, characterized in that: Using the intelligent weighing liquid level meter as claimed in claim 5 specifically comprises the following steps: S1: Install the intelligent weighing level meter in the medium of the liquid level to be measured. The radius of the sinker is r, the mass is W0, the material density is ρ0, the distance between any two liquid level sensing modules is L, the medium density of the liquid level to be measured is ρ1, and the sinker material density ρ0> the medium density ρ1; S2: The communication terminal collects the weight of the sinker and the situation of the liquid level sensing module being submerged by the medium through the weighing transmitter and the liquid level sensing module. The height of the liquid level sensing module on the sinker is set to U1, U2, ..., U n ; S3: When the medium density ρ1 is set to be known, the acquisition communication terminal collects the status of each liquid level sensing module and the weighing transmitter data W in real time. At this time, the real-time medium liquid level H is calculated as follows: H=(W0-W) / ρ1 / (π·r 2 ) (1) S4: When the medium density ρ1 is unknown or changes during the monitoring process, when the medium liquid surface passes through two consecutive liquid level sensing modules, the current liquid density can be measured in combination with the weighing change ΔW in the corresponding period. The liquid density calculation method is: Then, by substituting ρ1 into formula (1), the medium level can be calculated.

8. The method for measuring liquid level and density of a medium based on an intelligent weighing liquid level meter according to claim 7, characterized in that: In S3, the acquisition communication terminal calculates the liquid level change according to the collected state of the liquid level sensing module to form a series of discrete liquid level data with a resolution of L. Based on this, the real-time liquid level data calculated by weighing is corrected. When the deviation of the liquid level change measured by the liquid level sensing module and the weighing sensor in the same period is greater than the set deviation threshold, it indicates that there is a fault in the system and the acquisition communication terminal will alarm.

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