Intelligent metering device and method for liquid level, volume and weight of liquid in storage tank

Abstract

The invention relates to an intelligent metering device for the liquid level, volume and weight of liquid in a storage tank. The intelligent metering device comprises a liquid level meter, a controller module, a data module, a communication module, a remote user module, a discharging pump power module, a discharging pump power module and a cloud platform. The invention further comprises a working method of the metering device. The metering device has the beneficial effects that the metering device can display and store the liquid level, the volume and the weight of the storage tank in real time; a user can remotely display and monitor the liquid level, volume and weight information from the cloud platform in real time through the remote user module; high-liquid-level sound-light alarm and low-liquid-level sound-light alarm can be carried out, and the liquid level in the storage tank is prevented from being too high or too low; the metering device is suitable for common small storage tanks (especially storage tanks with various shapes for storing various acid-base dangerous liquids), and overcomes the defect that the liquid level, the volume and the weight of the liquids in various small storage tanks cannot be known in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of storage tank liquid level capacity and weight measurement, and particularly relates to an intelligent measurement device and method for the liquid level, volume and weight of liquid in a storage tank. Background Art

[0002] Storage tanks are containers for storing liquid substances such as acids, alkalis, alcohols, and water. Generally, according to different materials, there are: polyethylene storage tanks, polypropylene storage tanks, fiberglass storage tanks, ceramic storage tanks, rubber storage tanks, stainless steel storage tanks, steel storage tanks, etc. Steel sealed containers are steel storage tanks. The steel storage tank project is an essential and important infrastructure in industries such as petroleum, chemical industry, grain and oil, food, fire protection, transportation, metallurgy, and national defense. In our economic life, we are always inseparable from large and small steel storage tanks. Steel storage tanks are special equipment for storing various liquid (or gas) raw materials and finished products. For many enterprises, normal production cannot be carried out without storage tanks. Most of the oil storage facilities in our country are above-ground storage tanks, and most of them are of metal structure.

[0003] The existing methods for measuring the capacity of storage tanks mainly include geometric measurement method, capacity comparison method, and optoelectronic measurement method. However, these methods have the following disadvantages:

[0004] (1) The geometric measurement method measures the geometric dimensions of the storage tank through tools such as steel straight rulers and then calculates the storage tank capacity. It has a large workload, a complex calculation process, and a low degree of automation;

[0005] (2) The capacity comparison method injects a fixed amount of water into the storage tank multiple times and calculates the capacity table through multi-point height-capacity data interpolation. The capacity comparison method is relatively accurate, but it takes a long time and causes a large amount of water resource pollution;

[0006] (3) The optoelectronic measurement method measures the geometric dimensions of the storage tank through electronic devices such as total stations and then calculates the storage tank capacity. This method has a high cost, requires a wide field of view and good reflection conditions, and has poor effects on the tank wall with low reflectivity or at high places;

[0007] Existing liquid level gauges such as magnetic flap liquid level gauges, float ball liquid level gauges, steel belt liquid level gauges, radar liquid level gauges, magnetostrictive liquid level gauges, radio frequency admittance liquid level gauges, tuning fork liquid level gauges, glass plate / glass tube liquid level gauges, static pressure liquid level gauges, pressure liquid level transmitters, capacitive liquid level gauges, intelligent electric float liquid level gauges, buoy liquid level gauges, float drum liquid level transmitters, electric contact liquid level gauges, magnetic-sensitive two-color electronic liquid level gauges, external measurement liquid level gauges, ultrasonic liquid level gauges, differential pressure liquid level gauges (double flange liquid level gauges) can only measure the liquid level height and cannot measure the real-time capacity, volume and weight of the liquid in the storage tank.

[0008] The storage tank capacity measurement device described in the "Device and Method for Measuring the Capacity of Storage Tanks Using a Laser Tracker and a Robot" with the application number 202210491377.6 has the following disadvantages: (1) It is not convenient to use and requires a dedicated wall-climbing robot; (2) This device cannot measure small and irregular storage tanks because the wall-climbing robot cannot move in them; (3) This device can only measure the volume of an empty storage tank and cannot measure the volume of a storage tank filled with liquid; (4) This device cannot record and monitor the liquid level height, volume, and weight of the storage tank in real time; (5) This device cannot transmit the measured real-time data through a mobile Internet cloud platform, nor can it remotely monitor this device through a mobile Internet cloud platform.

[0009] Generally, only one liquid level gauge can be installed in a small and irregular storage tank. The liquid level gauge can only obtain an approximate value of the liquid level height, and cannot know the volume and weight of the liquid, nor can it record and store the weight and volume information of the liquid level gauge in real time, let alone understand the state of the liquid in the storage tank in real time through a mobile terminal. Summary of the Invention

[0010] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an intelligent metering device and method for the liquid level, volume, and weight of the liquid in a storage tank.

[0011] An intelligent metering device for the liquid level, volume, and weight of the liquid in a storage tank is provided with a supporting discharge pump, a storage tank, and a discharge pump; an external material pipeline is connected to the inlet end of the discharge pump, the outlet end of the discharge pump is connected to the inlet of the storage tank, the outlet of the storage tank is connected to the inlet end of the discharge pump through a pipeline, and the outlet end of the discharge pump is connected to a discharge pipeline; the metering device includes: a liquid level gauge, a controller module, a data module, a communication module, a remote user module, a discharge pump power supply module, a discharge pump power supply module, and a cloud platform; the liquid level gauge is always submerged below the liquid surface in the storage tank;

[0012] The liquid level gauge is electrically connected to the communication module, the communication module is electrically connected to the controller module, and the controller module is electrically connected to the data module; the communication module is wirelessly connected to the cloud platform, the discharge pump power supply module, the discharge pump power supply module, the discharge pump, and the discharge pump, and the cloud platform is wirelessly connected to the remote user module;

[0013] The liquid level gauge is used to obtain the actual liquid level in the storage tank according to a liquid level acquisition instruction and send the actual liquid level to the communication module;

[0014] The controller module is used to send a liquid level acquisition instruction to the communication module, calculate the volume and weight of the liquid in the storage tank according to the actual liquid level; send the liquid level, volume, and weight of the liquid in the storage tank to the data module and the communication module; read the liquid level, volume, and weight of the liquid in the storage tank in the data module; send a power supply / power-off instruction for the discharge pump to the communication module, and send a power supply / power-off instruction for the discharge pump to the communication module;

[0015] A communication module, which is used to forward the liquid level acquisition instruction to the liquid level gauge, forward the actual liquid level to the controller module, forward the liquid level, volume and weight of the liquid in the storage tank to the cloud platform, forward the power supply / power-off instruction of the discharge pump to the discharge pump power supply module, and forward the power supply / power-off instruction of the unloading pump to the unloading pump power supply module;

[0016] A cloud platform, which is used to forward the liquid level, volume and weight of the liquid in the storage tank to the remote user module according to the data display request;

[0017] A remote user module, which is used to send a data display request to the cloud platform and display the liquid level, volume and weight of the liquid in the storage tank;

[0018] A data module, which is used to store the liquid level, volume and weight of the liquid in the storage tank,

[0019] A discharge pump power supply module, which is used to supply power to / cut off the power of the discharge pump according to the power supply / power-off instruction of the discharge pump;

[0020] An unloading pump power supply module, which is used to supply power to / cut off the power of the unloading pump according to the power supply / power-off instruction of the unloading pump.

[0021] Preferably: it further includes an alarm device; the communication module is electrically connected to the alarm device; the controller module is used to compare the liquid level of the liquid in the storage tank with the set value and send an alarm instruction to the communication module; the communication module is used to forward the alarm instruction to the alarm device; the alarm device is used to issue an alarm according to the alarm instruction.

[0022] A working method of an intelligent metering device for the liquid level, volume and weight of the liquid in a storage tank includes the following steps:

[0023] The controller module sends a liquid level acquisition instruction to the communication module, the communication module forwards the liquid level acquisition instruction to the liquid level gauge, the liquid level gauge acquires the actual liquid level in the storage tank according to the liquid level acquisition instruction, the liquid level gauge sends the actual liquid level to the communication module, and the communication module forwards the actual liquid level to the controller module;

[0024] The controller module calculates the volume and weight of the liquid in the storage tank based on the actual liquid level, and the controller module sends the calculated liquid level, volume and weight of the liquid in the storage tank to the data module and the communication module; the communication module forwards the liquid level, volume and weight of the liquid in the storage tank to the cloud platform;

[0025] The remote user module sends a data display request to the cloud platform, the cloud platform forwards the liquid level, volume and weight of the liquid in the storage tank to the remote user module according to the data display request, and the remote user module displays the liquid level, volume and weight of the liquid in the storage tank;

[0026] The controller module compares the liquid level in the storage tank with the set value. If the liquid level exceeds the set value, it sends an alarm instruction to the communication module. The communication module forwards the alarm instruction to the alarm device, and the alarm device issues a high liquid level alarm according to the alarm instruction. At the same time as sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module. The discharge pump power supply module cuts off the power to the discharge pump according to the power-off instruction for the discharge pump, and stops injecting liquid into the storage tank.

[0027] Preferably, when the storage tank is an elliptical head tank, the way for the controller module to calculate the volume and weight of the liquid in the storage tank according to the actual liquid level is as follows:

[0028] Calculate the liquid volume in the elliptical head tank according to the following formula:

[0029]

[0030] In the above formula, h is the liquid level height, h i is the height inside the ellipsoidal head, r is the radius of the cylindrical part of the storage tank, and L is the length of the cylindrical part of the storage tank;

[0031] The specific calculation method of the value of is as follows:

[0032] If (r - h) / r ≥ 1, then

[0033] If (r - h) / r ≤ -1, then

[0034] If -1 < (r - h) / r < 1, then: arcsin(x) ≈ x + x 3 / 6 + 3x 5 / 40, where x = (r - h) / r;

[0035] Then, according to the actual density ρ of the liquid in the storage tank, calculate the weight M of the liquid according to M = ρ * V h Calculate the weight M of the liquid.

[0036] Preferably, the method further includes the following steps:

[0037] The controller module compares the liquid level in the storage tank with the set value. If the liquid level is lower than the set value, it sends an alarm instruction to the communication module. The communication module forwards the alarm instruction to the alarm device, and the alarm device issues a low liquid level alarm according to the alarm instruction. At the same time as sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module. The discharge pump power supply module cuts off the power to the discharge pump according to the power-off instruction for the discharge pump, so that the storage tank only receives liquid and does not discharge liquid.

[0038] The beneficial effects of the present invention are as follows:

[0039] The intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank of the present invention can display and store the liquid level, volume and weight of the storage tank in real time; users can remotely display and monitor the liquid level, volume and weight information from the cloud platform through the remote user module; the present invention conducts high liquid level sound and light alarm and low liquid level sound and light alarm to prevent the liquid level in the storage tank from being too high or too low.

[0040] The metering device of the present invention is applicable to common small storage tanks (especially storage tanks for various acid and alkali dangerous liquids with different shapes), and overcomes the defect that various small storage tanks cannot understand the liquid level, volume and weight of the liquid in the tank in real time. Description of the Drawings

[0041] Figure 1 It is a schematic diagram of the intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank of the present invention;

[0042] Figure 2 It is a schematic view of the intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank of the present invention.

[0043] Description of the reference numerals: discharge pump 1, storage tank 2, liquid level gauge 3, discharge pump 4, alarm device 5, controller module 6. Detailed Embodiments

[0044] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0045] Embodiment 1

[0046] As Figure 1 and Figure 2 shown, an intelligent metering device for the liquid level, volume and weight of the liquid in a storage tank is provided with a supporting discharge pump, storage tank and discharge pump; the external material pipeline is connected to the inlet end of the discharge pump, the outlet end of the discharge pump is connected to the inlet of the storage tank, the outlet of the storage tank is connected to the inlet end of the discharge pump through a pipeline, and the outlet end of the discharge pump is connected to the discharge pipeline; the metering device includes: a liquid level gauge, a controller module (PLC), a data module, a communication module (4G or 5G module), a remote user module, a discharge pump power module, a discharge pump power module, a cloud platform and an alarm device; the liquid level gauge is always immersed below the liquid level in the storage tank; the communication module provides a link for the connection between the PLC and the cloud platform.

[0047] The liquid level gauge is electrically connected to the communication module, the communication module is electrically connected to the alarm device, the communication module is electrically connected to the controller module, and the controller module is electrically connected to the data module; the communication module is wirelessly connected to the cloud platform, the discharge pump power module, the unloading pump power module, the discharge pump and the unloading pump, and the cloud platform is wirelessly connected to the remote user module;

[0048] The liquid level gauge is used to obtain the actual liquid level in the storage tank according to the liquid level acquisition instruction and send the actual liquid level to the communication module;

[0049] The controller module is used to send a liquid level acquisition instruction to the communication module, calculate the volume and weight of the liquid in the storage tank according to the actual liquid level; send the liquid level, volume and weight of the liquid in the storage tank to the data module and the communication module; read the liquid level, volume and weight of the liquid in the storage tank in the data module; send a power supply / power-off instruction for the discharge pump to the communication module, send a power supply / power-off instruction for the unloading pump to the communication module; compare the liquid level of the liquid in the storage tank with the set value, and send an alarm instruction to the communication module;

[0050] The communication module is used to forward the liquid level acquisition instruction to the liquid level gauge, forward the actual liquid level to the controller module, forward the liquid level, volume and weight of the liquid in the storage tank to the cloud platform, forward the power supply / power-off instruction for the discharge pump to the discharge pump power module, and forward the power supply / power-off instruction for the unloading pump to the unloading pump power module; forward the alarm instruction to the alarm device;

[0051] The cloud platform is used to forward the liquid level, volume and weight of the liquid in the storage tank to the remote user module according to the data display request;

[0052] The remote user module is used to send a data display request to the cloud platform and display the liquid level, volume and weight of the liquid in the storage tank;

[0053] The data module is used to store the liquid level, volume and weight of the liquid in the storage tank,

[0054] The discharge pump power module is used to supply power to / cut off the power of the discharge pump according to the power supply / power-off instruction for the discharge pump;

[0055] The unloading pump power module is used to supply power to / cut off the power of the unloading pump according to the power supply / power-off instruction for the unloading pump;

[0056] The alarm device is used to issue an alarm according to the alarm instruction.

[0057] Embodiment 2

[0058] Based on Embodiment 1, the working method of the intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank includes the following steps:

[0059] The controller module sends a liquid level acquisition instruction to the communication module. The communication module forwards the liquid level acquisition instruction to the liquid level gauge. The liquid level gauge acquires the actual liquid level in the storage tank according to the liquid level acquisition instruction, and the liquid level gauge sends the actual liquid level to the communication module. The communication module forwards the actual liquid level to the controller module;

[0060] The controller module calculates the volume and weight of the liquid in the storage tank based on the actual liquid level. When the storage tank is an elliptical head tank, the method for the controller module to calculate the volume and weight of the liquid in the storage tank is as follows:

[0061] Calculate the liquid volume in the elliptical head tank according to the following formula:

[0062]

[0063] In the above formula, h is the liquid level height, h i is the height inside the ellipsoidal head, r is the radius of the cylindrical part of the storage tank, and L is the length of the cylindrical part of the storage tank;

[0064] The calculation method of the value of is specifically as follows:

[0065] If (r - h) / r ≥ 1, then

[0066] If (r - h) / r ≤ -1, then

[0067] If -1 < (r - h) / r < 1, then: arcsin(x) ≈ x + x 3 / 6 + 3x 5 / 40, where x = (r - h) / r;

[0068] Then, according to the actual density ρ of the liquid in the storage tank (provided by the manufacturer), calculate the weight M of the liquid according to M = ρ * V h Calculate the weight M of the liquid;

[0069] The controller module sends the calculated liquid level, volume, and weight of the liquid in the storage tank to the data module and the communication module; the communication module forwards the liquid level, volume, and weight of the liquid in the storage tank to the cloud platform;

[0070] The remote user module sends a data display request to the cloud platform. The cloud platform forwards the liquid level, volume, and weight of the liquid in the storage tank to the remote user module according to the data display request, and the remote user module displays the liquid level, volume, and weight of the liquid in the storage tank;

[0071] The controller module compares the liquid level in the storage tank with the set value. If the liquid level exceeds the set value, it sends an alarm instruction to the communication module. The communication module forwards the alarm instruction to the alarm device, and the alarm device issues a high liquid level alarm according to the alarm instruction. At the same time as sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module. The discharge pump power supply module cuts off the power supply of the discharge pump according to the power-off instruction for the discharge pump, and stops filling the storage tank with liquid (that is, only draining and not filling) to prevent the liquid level in the storage tank from being too high.

[0072] The controller module compares the liquid level in the storage tank with the set value. If the liquid level is lower than the set value, it sends an alarm instruction to the communication module. The communication module forwards the alarm instruction to the alarm device, and the alarm device issues a low liquid level alarm according to the alarm instruction. At the same time as sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module. The discharge pump power supply module cuts off the power supply of the discharge pump according to the power-off instruction for the discharge pump (that is, the storage tank only fills and does not drain) to prevent the liquid level in the storage tank from being too low.

Claims

1. An intelligent metering device for the liquid level, volume and weight of liquid in a storage tank, which is equipped with a supporting discharging pump, a storage tank and a discharging pump; the external material pipeline is connected to the feeding end of the discharging pump, the discharging end of the discharging pump is connected to the feeding port of the storage tank, the discharging port of the storage tank is connected to the feeding end of the discharging pump through a pipeline, and the discharging end of the discharging pump is connected to a discharging pipeline; characterized in that, The metering device includes: a liquid level gauge, a controller module, a data module, a communication module, a remote user module, a discharge pump power supply module, a unloading pump power supply module, and a cloud platform; the liquid level gauge is always immersed below the liquid level in the storage tank; The liquid level gauge is electrically connected to the communication module, the communication module is electrically connected to the controller module, and the controller module is electrically connected to the data module; the communication module is wirelessly connected to the cloud platform, the discharge pump power supply module, the unloading pump power supply module, the discharge pump, and the unloading pump, and the cloud platform is wirelessly connected to the remote user module; The liquid level gauge is used to obtain the actual liquid level in the storage tank according to the liquid level acquisition instruction and send the actual liquid level to the communication module; The controller module is used to send a liquid level acquisition instruction to the communication module, calculate the volume and weight of the liquid in the storage tank according to the actual liquid level, send the liquid level, volume, and weight of the liquid in the storage tank to the data module and the communication module, read the liquid level, volume, and weight of the liquid in the storage tank in the data module, send a discharge pump power supply / power-off instruction to the communication module, and send a unloading pump power supply / power-off instruction to the communication module; The communication module is used to forward the liquid level acquisition instruction to the liquid level gauge, forward the actual liquid level to the controller module, forward the liquid level, volume, and weight of the liquid in the storage tank to the cloud platform, forward the discharge pump power supply / power-off instruction to the discharge pump power supply module, and forward the unloading pump power supply / power-off instruction to the unloading pump power supply module; The cloud platform is used to forward the liquid level, volume, and weight of the liquid in the storage tank to the remote user module according to the data display request; The remote user module is used to send a data display request to the cloud platform and display the liquid level, volume, and weight of the liquid in the storage tank; The data module is used to store the liquid level, volume, and weight of the liquid in the storage tank, The discharge pump power supply module is used to supply power to / switch off the power of the discharge pump according to the discharge pump power supply / power-off instruction; The unloading pump power supply module is used to supply power to / switch off the power of the unloading pump according to the unloading pump power supply / power-off instruction.

2. The intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank according to claim 1, characterized in that: It further includes an alarm device; the communication module is electrically connected to the alarm device; the controller module is used to compare the liquid level of the liquid in the storage tank with a set value and send an alarm instruction to the communication module; the communication module is used to forward the alarm instruction to the alarm device; the alarm device is used to issue an alarm according to the alarm instruction.

3. A working method of the intelligent metering device for the liquid level, volume and weight of the liquid in the storage tank as described in claim 2, characterized in that, It includes the following steps: The controller module sends a liquid level acquisition instruction to the communication module, the communication module forwards the liquid level acquisition instruction to the liquid level gauge, the liquid level gauge obtains the actual liquid level in the storage tank according to the liquid level acquisition instruction, the liquid level gauge sends the actual liquid level to the communication module, and the communication module forwards the actual liquid level to the controller module; The controller module calculates the volume and weight of the liquid in the storage tank based on the actual liquid level, and the controller module sends the calculated liquid level, volume, and weight of the liquid in the storage tank to the data module and the communication module; the communication module forwards the liquid level, volume, and weight of the liquid in the storage tank to the cloud platform; The remote user module sends a data display request to the cloud platform, the cloud platform forwards the liquid level, volume, and weight of the liquid in the storage tank to the remote user module according to the data display request, and the remote user module displays the liquid level, volume, and weight of the liquid in the storage tank; The controller module compares the liquid level of the liquid in the storage tank with the set value. If the liquid level exceeds the set value, it sends an alarm instruction to the communication module, the communication module forwards the alarm instruction to the alarm device, and the alarm device issues a high liquid level alarm according to the alarm instruction; while sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module; the discharge pump power supply module cuts off the power of the discharge pump according to the power-off instruction for the discharge pump and stops filling the storage tank with liquid.

4. The working method according to claim 3, characterized in that, When the storage tank is an elliptical head tank, the way for the controller module to calculate the volume and weight of the liquid in the storage tank based on the actual liquid level is as follows: Calculate the liquid volume in the elliptical head tank according to the following formula: In the above formula, h is the liquid level height, h i is the height inside the ellipsoidal head, r is the radius of the cylindrical part of the storage tank, and L is the length of the cylindrical part of the storage tank; The value is calculated specifically as follows: If (r - h) / r ≥ 1, then If (r - h) / r ≤ -1, then If -1 < (r - h) / r < 1, then: arcsin(x) ≈ x + x 3 / 6 + 3x 5 / 40, where x = (r - h) / r; Then, according to the actual density ρ of the liquid in the storage tank, calculate the weight M of the liquid according to M = ρ * V h Calculate the weight M of the liquid 5. The working method according to claim 3, characterized in that, It also includes the following steps: The controller module compares the liquid level of the liquid in the storage tank with the set value. If the liquid level is lower than the set value, it sends an alarm instruction to the communication module, the communication module forwards the alarm instruction to the alarm device, and the alarm device issues a low liquid level alarm according to the alarm instruction; while sending the alarm instruction, the controller module sends a power-off instruction for the discharge pump to the communication module, and the communication module forwards the power-off instruction for the discharge pump to the discharge pump power supply module; the discharge pump power supply module cuts off the power of the discharge pump according to the power-off instruction for the discharge pump and makes the storage tank only receive liquid without discharging liquid.

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