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

Abstract

The application discloses a kind of intelligent weighing type liquid level meter and medium liquid level, density measurement method, including porous pipe shell, weighing sensor, weighing transmitter, acquisition communication terminal, sink, power supply module, weighing sensor is installed in the inside of porous pipe shell top, and is electrically connected with heavy transmitter, sink is hung on the weighing sensor by flexible line, weighing transmitter is electrically connected with acquisition communication terminal, and power supply module is powered to weighing sensor, weighing transmitter, acquisition communication terminal.The application can realize the accurate liquid level monitoring under the unknown density or variable density of the liquid to be measured, can be applied to the complex scene such as solute concentration change industry, complex water conservancy industry such as river silt condition, and has high popularization and application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural environment monitoring, in particular to an intelligent weighing type liquid level meter and a measuring method thereof. BACKGROUND

[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 in terms of measurement form. Non-contact types mainly include laser liquid level meters, radar wave liquid level meters, ultrasonic liquid level meters, etc. These liquid level meters have the advantage of being not affected by the density change of the liquid, but the laser liquid level meter needs to set a reflector for most liquids, the radar wave liquid level meter generally has a large beam, and it is difficult to adapt to the measurement of narrow spaces, and the measurement accuracy of the ultrasonic liquid level meter is greatly affected by air temperature and humidity. In the contact type liquid level meter, the most commonly used types are float type, magnetic reed type, pressure type, etc. The float type can achieve accurate measurement by dragging the float ball to contact the liquid surface through the coded motor, but it has many moving parts and high power consumption. The resolution of the magnetic reed type is poor, and the pressure type generally has low power consumption and high accuracy, but it is prone to blockage, drift, etc. in the field with the increase of service life. The biggest problem is that the core principle of the pressure type liquid level meter for measuring liquid level is P = pgH, which is closely related to the density of the measured liquid, and it is only suitable for liquids with known and constant density, and it is difficult to cope with the density change of the measured liquid caused by factors such as the change of solute concentration in the industrial scene and the change of river sediment in the water conservancy industry. In addition, the cost of the above-mentioned several types of liquid level meters is generally high, which is not conducive to the popularization of liquid level monitoring. SUMMARY

[0003] The present application aims to provide an intelligent weighing type liquid level meter and a measuring method thereof which can accurately measure the liquid level and measure the density of the measured liquid at the same time.

[0004] Technical solution: The intelligent weighing type liquid level meter comprises a perforated pipe shell, a weighing sensor, a weighing transmitter, a collection communication terminal, a sink body, and a power supply module. The weighing sensor is installed on the inner side of the top of the perforated pipe shell, the weighing sensor is electrically connected with the weighing transmitter, the weighing transmitter is electrically connected with the collection communication terminal, the sink body is hung on the weighing sensor, and the power supply module supplies power to the weighing transmitter and the collection communication terminal.

[0005] Further, the perforated pipe shell is wrapped with a geotextile which is water permeable and mud impermeable.

[0006] Further, the sink body is hung on the weighing sensor through a flexible line.

[0007] Further, the density of the sink body is greater than that of the measured liquid medium.

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

[0009] Further, the connecting line between the liquid level sensing module and the collection communication terminal is a plurality of soft wires for hanging the sinker on the weighing sensor.

[0010] A medium liquid level and density measurement method based on an intelligent weighing type liquid level meter, using the intelligent weighing type liquid level meter as described above, specifically comprising the following steps:

[0011] S1: installing the intelligent weighing type liquid level meter in the medium of the liquid level to be measured, the sinker radius 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> medium density ρ1;

[0012] S2: The collection communication terminal collects the weight of the sinker, the liquid level sensing module being submerged by the medium, respectively, through the weighing transmitter and the liquid level sensing module, and the heights of the liquid level sensing modules on the sinker are respectively set as U1, U2, …, U n ;

[0013] S3: When the medium density ρ1 is set as known, the collection communication terminal collects the state of each liquid level sensing module and the weighing transmitter data W in real time, and at this time, the measured real-time medium liquid level H is calculated in the following manner:

[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 liquid level sensing modules in succession, the current liquid density can be measured in combination with the weighing change ΔW in the corresponding period, and the liquid density calculation method is as follows:

[0016]

[0017] Further, ρ1 is brought into formula (1), and the medium liquid level can be calculated.

[0018] Further, in S3, the collection communication terminal calculates the liquid level change according to the collected liquid level sensing module state, forms a series of discrete liquid level data with a resolution of L, and corrects the real-time liquid level data calculated according to the weighing according to the standard, and when the liquid level change amount in the same period measured by the liquid level sensing module and the weighing sensor is greater than the set deviation threshold, it indicates that the system has a fault, and the collection communication terminal alarms.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following advantages: The present invention achieves 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. It is particularly suitable for complex liquid level measurement in industrial scenarios where the density of the liquid to be measured changes due to factors such as changes in the solute concentration of the liquid to be measured and changes in river sediment in the water conservancy industry. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the weighing level gauge of the present invention. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0022] This invention provides an intelligent weighing level gauge and its measurement method, such as... Figure 1 As shown, the device includes a porous tube housing 1, a load cell 2, a load transmitter 3, a data acquisition and communication terminal 4, a sink 5, and a power supply module 6. The load cell 2 is installed on the top inner side of the porous tube housing 1. The load cell 2 is electrically connected to the load transmitter 3, and the load transmitter 3 is electrically connected to the data acquisition and communication terminal 4. The sink 5 is suspended on the load cell 2 by a flexible cable. The power supply module 6 is electrically connected to the load transmitter 2, the load transmitter 3, and the data acquisition and communication terminal 4.

[0023] In some embodiments, to avoid the impact of siltation on the liquid level measurement results during liquid level monitoring, the porous tube shell 1 is wrapped with a geotextile 7 that is permeable to water but impermeable to silt.

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

[0025] In some embodiments, to correct measurement errors caused by real-time weighing of liquid level and to achieve accurate liquid level measurement even when the density of the liquid to be measured changes or is unknown, multiple liquid level sensing modules 8 are axially arranged on the sink 5, and the liquid level sensing modules 8 are electrically connected to the data acquisition and communication terminal 4. The connection line between the liquid level sensing modules 8 and the data acquisition and communication terminal 4 is a multi-strand flexible wire suspending the sink 5 from the weighing sensor 2.

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

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

[0028] S2: The communication terminal collects the weight of the sink body and the condition of the liquid level sensing module being submerged by the medium through the weighing transmitter and the liquid level sensing module, respectively, and the heights of the liquid level sensing modules on the sink body are set as U1, U2,..., U n ;

[0029] S3: When the medium density p1 is set as known, the communication terminal collects the state of each liquid level sensing module and the weighing transmitter data W in real time, and the measured real-time medium liquid level H is calculated as follows:

[0030] H = (W0-W) / p1 / (π·r 2 ) (1) S: When the medium density p1 is unknown or changes during the monitoring process, when the medium liquid surface passes through two continuous liquid level sensing modules, the current liquid density can be measured by combining the weighing change amount AW of the corresponding period, and the liquid density calculation method is as follows:

[0031]

[0032] Then, p1 is brought into formula (1), and the medium liquid level can be calculated.

[0033] In some embodiments, the communication terminal calculates the liquid level change condition according to the collected liquid level sensing module state, forms a series of discrete liquid level data with a resolution of L, corrects the real-time liquid level data calculated according to the weighing according to the standard, and when the deviation of the liquid level change amount 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 the system has a fault, and the communication terminal alarms.

Claims

1. A method for measuring the liquid level and density of a medium based on an intelligent weighing level gauge, characterized in that, The intelligent weighing level gauge includes a porous tube housing (1), a weighing sensor (2), a weighing transmitter (3), a data acquisition and communication terminal (4), a sink body (5), and a power supply module (6). Multiple level sensing modules (8) are axially arranged on the sink body (5). The level sensing modules (8) are electrically connected to the data acquisition and communication terminal (4). The weighing sensor (2) is installed on the top inner side of the porous tube housing (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 sink body (5) is suspended on the weighing sensor (2). The power supply module (6) supplies power to the weighing transmitter (3) and the data acquisition and communication terminal (4). Implement the following steps: S1: Install the intelligent weighing level gauge in the medium to be measured. The radius of the sink is r, the mass is W0, the material density is ρ0, the distance between any two level sensing modules is L, the density of the medium to be measured is ρ1, and the material density of the sink is ρ0 > the density of the medium to be measured is ρ1. S2: The data acquisition and communication terminal collects the weight of the submerged body and the submersion status of the liquid level sensing module through the weighing transmitter and the liquid level sensing module, respectively. The heights of the liquid level sensing modules on the submerged body are set as U1, U2, ..., U... n ; S3: When the medium density ρ1 is set to be known, the data acquisition and communication terminal collects the status of each liquid level sensing module and the weighing transmitter data W in real time. The real-time medium liquid level H measured at this time is calculated as follows: H=(W0-W) / ρ1 / (π·r 2 ) (1) S4: When the medium density ρ1 is unknown or changes during monitoring, the current liquid density can be measured by combining the weighing change ΔW of the corresponding time period when the liquid level passes through two consecutive liquid level sensing modules. The liquid density is calculated as follows: Then, ρ1 is substituted into equation (1) to calculate the liquid level of the medium.

2. The method for measuring the liquid level and density of a medium based on an intelligent weighing level gauge according to claim 1, characterized in that, In step S3, the acquisition and communication terminal calculates the liquid level change based on the acquired liquid level sensing module status, forming a series of discrete liquid level data with a resolution of L. Using this as a standard, the real-time liquid level data calculated based on weighing is corrected. When the deviation between the liquid level change measured by the liquid level sensing module and the weighing sensor in the same time period is greater than the set deviation threshold, it indicates that there is a fault in the system, and the acquisition and communication terminal will issue an alarm.

3. The method for measuring the liquid level and density of a medium based on an intelligent 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 impermeable to mud and sand.

4. The method for measuring the liquid level and density of a medium based on an intelligent weighing level gauge according to claim 1, characterized in that, The sinker (5) is suspended from the load cell (2) by a flexible wire.

5. The method for measuring the liquid level and density of a medium based on an intelligent weighing level gauge according to claim 1, characterized in that, The density of the sediment (5) is greater than that of the liquid medium being measured.

6. The method for measuring the liquid level and density of a medium based on an intelligent weighing level gauge according to claim 1, characterized in that, The connection line between the liquid level sensing module (8) and the data acquisition and communication terminal (4) is a multi-strand soft wire that suspends the sinker (5) on the weighing sensor (2).

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