Liquid level measuring device, liquid level measuring method and liquid container

Abstract

The invention provides a liquid level measuring device, a liquid level measuring method and a liquid container, and the liquid level measuring device comprises a sensor which is provided with a stay wire; the rotating component is connected with the other end of the stay wire and is used for rotating by taking a rotating shaft as a center; one end of the connecting rod is fixed to the rotating assembly, and the other end of the connecting rod extends outwards from the rotating assembly; the buoy is connected to the other end of the connecting rod and floats on the surface of the liquid, the buoy moves along with the change of the liquid level of the liquid, the movement of the buoy drives the connecting rod to rotate with the rotating shaft of the rotating assembly as the center, and meanwhile, the movement of the buoy drives the pull wire to generate displacement through the rotation of the connecting rod and the rotating assembly; the processor is electrically connected with the sensor; the sensor is used for converting displacement generated by the stay wire into electric signals, and the processor determines and outputs liquid level data of liquid based on the electric signals. Accurate detection of the liquid level is achieved, tiny changes of the liquid level can be detected, meanwhile, the buoy cannot be wound in the moving process, and product faults are avoided.

Description

Technical Field

[0001] This disclosure relates to the field of liquid level measurement technology, and in particular to a liquid level measuring device, a liquid level measuring method, and a liquid container. Background Technology

[0002] Traditional level gauges, which use ball bearings and contact sensors, can only perform coarse water level detection and cannot detect subtle changes in water level. They cannot provide accurate water level data and can only detect water level at a single point, outputting a switching signal. Moreover, during sewage level detection, impurities in the sewage can affect the movement of the level gauge. For example, the float in a float level gauge can easily get stuck, failing to achieve ideal measurement results. Such level gauges cannot be used for sewage lifting products that require precise control. Summary of the Invention

[0003] The technical problem to be solved by this disclosure is to overcome the shortcomings of the prior art in accurately measuring the liquid level height, and to provide a liquid level measuring device, a liquid level measuring method, and a liquid container.

[0004] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0005] In a first aspect, a liquid level measuring device is provided for measuring the liquid level of a liquid, the liquid level measuring device comprising:

[0006] The sensor is equipped with a pull wire;

[0007] A rotating component, connected to the other end of the pull wire, is used to rotate around its rotation axis;

[0008] A connecting rod, one end of which is fixed to the rotating assembly, and the other end of which extends outward from the rotating assembly;

[0009] A buoy is connected to the other end of the connecting rod and floats on the surface of the liquid. The buoy moves with the change of the liquid level. The movement of the buoy causes the connecting rod to rotate around the rotation axis of the rotating assembly. At the same time, the movement of the buoy causes the pull line to be displaced through the rotation of the connecting rod and the rotating assembly.

[0010] A processor is electrically connected to the sensor; the sensor is used to convert the displacement generated by the pull wire into an electrical signal, and the processor determines and outputs the liquid level data of the liquid based on the electrical signal.

[0011] Optionally, the liquid level measuring device further includes a housing, the sensor and the rotating assembly are disposed inside the housing, the housing is provided with a sealing assembly, and the connecting rod is sealed to the rotating assembly through the sealing assembly.

[0012] Optionally, the outer diameter of the rotating component is provided with a groove so that the draw wire is wound around the outer diameter of the rotating component;

[0013] And / or, the rotating component is a turntable.

[0014] Optionally, the processor includes:

[0015] The first determining module is used to determine the first displacement generated by the pull wire based on the electrical signal, and to determine the rotation angle of the connecting rod based on the first displacement;

[0016] The second determining module is used to determine the second displacement of the buoy in the vertical direction based on the rotation angle;

[0017] An output module is used to determine and output the liquid level data of the liquid based on the second displacement.

[0018] Optionally, the second determining module includes:

[0019] The first determining unit is used to determine the included angle between the connecting rod and the intermediate line segment based on the rotation angle, the initial position and the final position of the buoy; the intermediate line segment is the line segment formed by connecting the initial position and the final position;

[0020] The second determining unit is used to determine the second displacement of the buoy in the vertical direction based on the included angle.

[0021] Secondly, a method for measuring liquid level is provided, applied to the liquid level measuring device of the first aspect, the method comprising:

[0022] The rotation angle of the connecting rod is determined based on the first displacement of the pull wire; the first displacement is acquired by the sensor.

[0023] Based on the rotation angle, determine the second displacement of the buoy in the vertical direction;

[0024] The liquid level data is determined based on the second displacement.

[0025] Optionally, determining the second vertical displacement of the buoy based on the rotation angle includes:

[0026] Based on the rotation angle, the initial position and the final position of the buoy, the included angle between the connecting rod and the intermediate line segment is determined; the intermediate line segment is the line segment formed by connecting the initial position and the final position.

[0027] Based on the included angle, the second displacement of the buoy in the vertical direction is determined.

[0028] Optionally, determining the second vertical displacement of the buoy based on the included angle includes:

[0029] Based on the rotation angle and the first length of the connecting rod, determine the second length of the intermediate line segment;

[0030] Based on the included angle and the second length, the second displacement of the buoy in the vertical direction is determined.

[0031] Optionally, after determining the liquid level data based on the second displacement, the method further includes:

[0032] Based on the liquid level data, the operating power of the water pump is determined; the water pump is used to discharge liquid.

[0033] Thirdly, a liquid container is provided, including a container body and the liquid level measuring device described in the first aspect, wherein the liquid level measuring device is disposed within the container body.

[0034] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0035] The positive improvements of this disclosure are as follows: By combining the pull line, rotating component, and connecting rod, precise liquid level detection is achieved. This allows for the detection of minute changes in liquid level, providing accurate data to meet the precise control requirements of the system. Consequently, the operating efficiency of the wastewater treatment product can be improved, achieving energy conservation and emission reduction requirements. Simultaneously, the connecting rod reduces the probability of the buoy's running track getting stuck, preventing the buoy from tangling during movement and avoiding product malfunctions. Attached Figure Description

[0036] Figure 1 A first structural schematic diagram of a liquid level measuring device provided for an exemplary embodiment of this disclosure;

[0037] Figure 2 A second structural schematic diagram of a liquid level measuring device provided as an exemplary embodiment of this disclosure;

[0038] Figure 3 A third structural schematic diagram of a liquid level measuring device provided as an exemplary embodiment of this disclosure;

[0039] Figure 4 A first flowchart of a liquid level measurement method provided as an exemplary embodiment of this disclosure;

[0040] Figure 5 A first flowchart of displacement calculation for a liquid level measurement method provided as an exemplary embodiment of this disclosure;

[0041] Figure 6A second flowchart of displacement calculation for a liquid level measurement method provided as an exemplary embodiment of this disclosure;

[0042] Figure 7 A second flowchart of a liquid level measurement method provided for an exemplary embodiment of this disclosure. Detailed Implementation

[0043] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the document does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] As illustrated herein, unless the context clearly indicates otherwise, the words “a,” “an,” “an,” and / or “the” do not specifically refer to the singular and may also include the plural. Generally speaking, the terms “comprising” and “including” only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0046] The definitions used herein, such as the terms “having,” “may have,” “comprising,” or “may include,” indicate the presence of the corresponding function, operation, element, etc., and do not limit the presence of one or more other functions, operations, elements, etc. Furthermore, it should be understood that the terms “comprising” or “having” as used herein indicate the presence of the features, figures, steps, operations, elements, components, or combinations thereof described in the specification, without excluding the presence or addition of one or more other features, figures, steps, operations, elements, components, or combinations thereof.

[0047] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not be construed as an unnecessary limitation. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0048] Furthermore, the directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0049] Existing level gauges have several drawbacks. For example, float level gauges using traditional pull-wire methods are significantly limited by the pull wire. As the float moves with changes in liquid level, its trajectory can easily become stuck, potentially causing entanglement and hindering accurate level measurement. This is especially true in sewage and other liquids containing impurities, where entanglement is more likely. Furthermore, for multi-point level measurements, multiple floats are required, increasing the likelihood of wire entanglement. Similarly, level gauges using the rotation angle of a potentiometer measure the liquid level by rotating the potentiometer on a scale. However, the scale's graduations are typically large, and rotating the potentiometer between each graduation only provides a narrow angular range, resulting in coarse level detection. This fails to detect subtle changes in liquid level and provides inaccurate data. Additionally, traditional level gauges require calculations of the distance between the liquid and the sensor, and the distance from the liquid surface to the bottom, making the measurement process relatively complex. Based on this, the present disclosure provides a liquid level measuring device that, based on the combination of a pull wire, a rotating component, and a connecting rod, achieves accurate detection of the liquid level, meets the requirements for precise control of the system, avoids the entanglement of the float during movement, achieves good liquid level measurement results, and has a simple calculation method for liquid level measurement, and the liquid level measuring device is simple in design and low in cost.

[0050] Figure 1 A liquid level measuring device is provided as an exemplary embodiment of this disclosure for measuring the liquid level. The liquid level measuring device includes a sensor 11, a rotating assembly 12, a connecting rod 13, a float 14, and a processor. The sensor 11 is provided with a pull wire, and the sensor 11 and the rotating assembly 12 are connected by the pull wire. One end of the pull wire is wound around a pulley inside the sensor 11, and the other end is connected to the rotating assembly 12. The rotating assembly 12 rotates around its rotation axis. The float 14 is connected to the rotating assembly 12 by the connecting rod 13. One end of the connecting rod is fixed to the rotating assembly 12, and the other end extends outward from the rotating assembly 12 and connects to the float 14, which floats on the liquid surface. The float 14 moves with changes in the liquid level.

[0051] When the liquid level changes, the float 14 is submerged in the liquid, and the liquid exerts buoyancy on it. The movement of the float 14 causes the connecting rod 13 to rotate around the rotation axis of the rotating assembly 12. The rotation of the connecting rod 13 and the rotating assembly 12 causes the pull wire to move. The sensor 11 converts the displacement of the pull wire into an electrical signal. The processor, which is electrically connected to the sensor, determines and outputs the liquid level data based on this electrical signal. When there is no liquid in the container where the liquid level measuring device is located, the float 14 is in its initial position, and there is no external force to push it to move. The pull wire does not move, and the sensor 11 does not generate an electrical signal.

[0052] The buoy's volume is designed to generate sufficient buoyancy to push the connecting rod, meeting the power requirements of the liquid level measurement device and preventing the buoy from failing to reach the top of the liquid level. Furthermore, the buoy has a sealed structure, preventing liquid from entering its interior, thus ensuring that the buoyancy remains constant in the same liquid and guaranteeing the accuracy of the liquid level measurement.

[0053] The sensor can be a linear sensor, which consists of a pull wire and an internal pulley. One end of the pull wire is wound around the pulley, and the other end is connected to a rotating component. When the rotating component rotates, it drives the pull wire to move, which in turn drives the pulley to rotate, thereby generating an electrical signal from the linear sensor.

[0054] The processor can be a PLC (Programmable Logic Controller). The sensor sends an electrical signal to the PLC, which then calculates the liquid level data using its internal algorithm.

[0055] In one embodiment, such as Figure 2 As shown, the liquid level measuring device includes a housing 16, a sensor and a rotating assembly are disposed inside the housing 16, a sealing assembly 22 is provided on the housing, and the connecting rod is sealed to the rotating assembly 12 through the sealing assembly 22.

[0056] like Figure 3 As shown, the housing is provided with a mounting base for connecting the rotating component 12 inside the housing and the connecting rod 13 outside the housing. The other end of the connecting rod is connected to the float 14 outside the housing. The mounting base is provided with a sealing structure, such as a sealing cover. The sealing design isolates the sensor 11 and the rotating component 12 inside the housing from the external liquid, ensuring the sealing of the housing. This allows the liquid level measuring device to be installed in a container filled with liquid to achieve underwater detection, meet the requirements of immersion detection, and overcome the defect of traditional float level gauges that need to be placed at the top of the liquid.

[0057] In one embodiment, the rotating component is a turntable, consisting of a rotating shaft and a disk body surrounding the rotating shaft. A connecting rod connects to the rotating shaft of the turntable so as to drive the turntable to rotate synchronously in the forward and reverse directions via the connecting rod.

[0058] In one embodiment, the outer diameter of the rotating component has a groove to allow the pull wire to be wound around the outer diameter of the rotating component. The groove on the outer diameter of the rotating component allows the sensor's pull wire to be wound freely within the groove, enabling flexible deployment and retraction.

[0059] By combining a pull line, a rotating assembly, and a connecting rod, a sensor detects the displacement caused by the buoy pulling the pull line. The processor calculates the rotation angle generated by the rotating assembly based on the displacement, thereby determining the buoy's displacement in the vertical direction and thus determining the liquid level data. The liquid level measuring device provided in this embodiment combines the pull line and rotation angle, effectively improving upon the shortcomings of traditional liquid level gauges. The sensor-measured pull line displacement has high accuracy, reaching 0.1mm, enabling accurate water level detection and providing accurate water level data. Furthermore, only the pull line displacement needs to be acquired; by calculating the buoy's displacement from the pull line displacement, the liquid level height can be determined. The measurement method is simple and convenient, easy to operate and execute, reducing errors caused by complex operations. The liquid level calculation method is simple, requiring no complex logic or lengthy processing time, thus improving measurement efficiency.

[0060] For existing level gauges used for single-point level measurement, with a single float, the pull-wire track is easily affected by impurities in liquids containing impurities, such as sewage. This causes the track to deviate, resulting in a longer pull-wire and inaccurate level measurement. For multi-point level measurement, with multiple floats, the pull-wires connecting the floats are prone to tangling, affecting normal operation. The level measuring device provided in this disclosure effectively improves upon these shortcomings of the prior art by incorporating connecting rods. For single-point measurement, the rotating rod avoids interference from impurities in the liquid on the running track. For multi-point measurement, the rotating rods can be staggered, preventing tangling when rotating around the rotating assembly, thus improving the accuracy of level measurement.

[0061] Existing level gauges use a float to rotate a fan-shaped disk, with one end of the disk engaging different grooves on a scale to measure different rotation angles. However, this method only provides a range of angles, resulting in a coarse level reading. The level measuring device provided in this disclosure uses a linear sensor to measure the displacement of a pull wire, achieving an accuracy of 0.1 mm. This allows for the detection of minute changes in the level, providing accurate level data and meeting the requirements for precise system control.

[0062] The liquid level measuring device provided in this embodiment can be applied to the measurement of sewage liquid level. By connecting a float and a connecting rod, the float drives the connecting rod to rotate around a rotating assembly. The rotating rod is a rigid object, which avoids the problem of the float getting stuck in its running track due to impurities in the sewage, thus meeting the requirements of precise system control and improving the operating efficiency of subsequent sewage lifting products, achieving energy conservation and emission reduction requirements. It should be noted that the liquid used for level measurement in this embodiment can be sewage or other liquids, such as purified water, oil, alcohol, chemical mixtures, rainwater, etc. Good liquid level measurement results can also be achieved in other liquids.

[0063] In one embodiment, the processor includes a first determining module, a second determining module, and an output module. For example... Figure 1 As shown, after receiving the electrical signal, the processor determines the first displacement L1 generated by the pull wire based on the electrical signal, and determines the rotation angle θ1 of the connecting rod based on the first displacement L1. The second determination module determines the second displacement d2 of the buoy in the vertical direction based on the rotation angle θ1. The output module determines and outputs the liquid level data based on the second displacement d2. It can be understood that the liquid level data can be calculated directly, or it can be calculated by first calculating the change in liquid level, and then obtaining the current liquid level based on the initial liquid level and the change in liquid level. For example, the liquid level can be calculated by subtracting the change in liquid level from the initial liquid level, or by adding the change in liquid level to the initial liquid level.

[0064] In one embodiment, the second determining module includes a first determining unit and a second determining unit. The first determining unit determines the included angle θ3 between the connecting rod and the intermediate line segment based on the rotation angle θ1, the initial position 17 and the final position 18 of the buoy, wherein the intermediate line segment is the line segment formed by connecting the initial position 17 and the final position 18. The second determining unit determines the second displacement d2 of the buoy in the vertical direction based on the included angle.

[0065] The following is combined with Figure 1 The working principle of the liquid level measuring device will be further explained below:

[0066] When the container containing the level measuring device is empty, the float 14 is in its initial position, and no external force propels it to move. The pull line does not displace, and the sensor 11 does not generate an electrical signal. When the liquid level changes, the float 14 is submerged in the liquid, and the liquid exerts buoyancy on it. The movement of the float 14 causes the connecting rod 13 to rotate around the rotation axis of the rotating assembly 12. The rotation of the connecting rod 13 and the rotating assembly 12 causes displacement of the pull line. The sensor 11 converts this displacement into an electrical signal and sends it to the processor. The first determining module in the processor determines the first displacement L1 generated by the pull wire based on the electrical signal, and determines the rotation angle θ1 of the connecting rod based on the first displacement L1. The length R of the connecting rod and the rotation angle θ1 generated by the rotation of the connecting rod are known. The line connecting the connecting rod and the initial position 17 of the buoy, the line connecting the connecting rod and the final position 18, and the intermediate line segment can form a triangle. The first determining unit in the second determining module can obtain the included angle θ3 between the connecting rod 13 and the intermediate line segment based on the rotation angle θ1, the initial position 17, and the final position 18. Based on the length of the connecting rod, i.e., the first length R, and the rotation angle θ1, the second length d1 of the intermediate line segment can be obtained. Based on the included angle θ3, the second length d1, and the first length R of the connecting rod, the second determining unit can calculate the second displacement d2 of the buoy in the vertical direction. The output module determines and outputs the liquid level data based on the second displacement, thus completing the liquid level measurement.

[0067] The specific calculation method is as follows:

[0068]

[0069] θ2 = θ1;

[0070] θ4 = θ2 + θ0 - 90;

[0071] θ3 = (180 - θ2) / 2;

[0072] θ5 = θ3 + θ4;

[0073]

[0074] d2 = d1 * sin(θ5);

[0075] In this context, the first displacement generated by the pull line is L1, the length of the connecting rod is R, the radius of the rotating component is r, the length of the line segment between the initial position 17 and the final position 18 of the buoy is d1, the second displacement of the buoy in the vertical direction is d2, θ1 is the rotation angle of the connecting rod, θ3 is the angle between the connecting rod and the intermediate line segment, and θ2, θ4 and θ5 are intermediate quantities calculated, which will not be elaborated here.

[0076] The following is combined with Figure 1The liquid level measuring device mentioned in the above embodiments, and the liquid level measuring method are further explained below:

[0077] The liquid level measurement method provided in this disclosure is applied to a liquid level measuring device, such as... Figure 4 As shown, the liquid level measurement method includes the following steps:

[0078] S41. Based on the first displacement of the pull wire, determine the rotation angle of the connecting rod.

[0079] The first displacement is acquired by a sensor and transmitted to the processor in the form of an electrical signal.

[0080] The buoy's movement causes the connecting rod to rotate around the rotation axis of the rotating component. The rotation of the connecting rod and the rotating component causes the pull line to generate a first displacement. The sensor converts the first displacement generated by the pull line into an electrical signal and sends the electrical signal to the processor. The processor calculates the rotation angle of the connecting rod.

[0081] S42. Based on the rotation angle, determine the second displacement of the buoy in the vertical direction.

[0082] In one embodiment, such as Figure 5 As shown, S42 specifically includes:

[0083] S421. Based on the rotation angle, the initial position and the final position of the buoy, determine the included angle between the connecting rod and the intermediate line segment.

[0084] S422. Based on the included angle, determine the second displacement of the buoy in the vertical direction.

[0085] The middle segment is the line segment connecting the initial and final positions of the buoy.

[0086] The length of the connecting rod and the rotation angle generated by the rotation of the connecting rod are known. The lines connecting the initial position of the connecting rod and the buoy, the lines connecting the connecting rod and the final position, and the lines connecting the initial position and the final position can form triangles. Based on the rotation angle, the initial position, and the final position, the angle between the connecting rod and the middle line segment can be obtained. Based on the angle, the second displacement of the buoy in the vertical direction can be determined.

[0087] In one embodiment, such as Figure 6 As shown, S422 includes:

[0088] S4221. Based on the rotation angle and the first length of the connecting rod, determine the second length of the intermediate line segment.

[0089] S4222. Based on the included angle and the second length, determine the second displacement of the buoy in the vertical direction.

[0090] The first length of the connecting rod and the rotation angle generated by the rotation of the connecting rod are known. The line connecting the initial position of the connecting rod and the buoy, the line connecting the connecting rod and the final position, and the middle line segment can form a triangle. Based on the first length and the rotation angle, the second length of the middle line segment can be obtained. Based on the included angle, the second length, and the first length of the connecting rod, the second displacement of the buoy in the vertical direction can be calculated.

[0091] S43. Determine the liquid level data based on the second displacement.

[0092] After the processor calculates the second displacement, it then calculates the liquid level data based on the second displacement.

[0093] In one embodiment, after S43, the following is also included:

[0094] Based on the liquid level data, the operating power of the water pump is determined.

[0095] The water pump is used to discharge liquid.

[0096] like Figure 7 As shown, the buoy's movement drives the pull line to generate displacement via a rotating component. A sensor sends this displacement data to the PLC. The PLC calculates the liquid level data using an algorithm and sends this data to the pump control CPU (Central Processing Unit). The CPU receives the data, processes it through logical operations to convert it into speed parameters, and sends this information to the pump's frequency converter. The frequency converter adjusts its operating power based on the received speed parameters, thus achieving variable speed control and ultimately ensuring precise pump operation. Accurate liquid level detection via a liquid level detection device enables variable speed control of the pump, allowing for different drainage speeds at different liquid levels. This efficient control of the pump operation achieves energy conservation and emission reduction.

[0097] The following is combined with Figure 1 The method for measuring liquid level is further explained below:

[0098] When the container containing the level measuring device is empty, the float 14 is in its initial position, and no external force propels it to move. The pull line does not displace, and the sensor 11 does not generate an electrical signal. When the liquid level changes, the float 14 is submerged in the liquid, and the liquid exerts buoyancy on it. The movement of the float 14 causes the connecting rod 13 to rotate around the rotation axis of the rotating assembly 12. The rotation of the connecting rod 13 and the rotating assembly 12 causes displacement of the pull line. The sensor 11 converts this displacement into an electrical signal and sends it to the processor. The processor determines the first displacement L1 generated by the pull wire based on the electrical signal and calculates the rotation angle θ1 of the connecting rod. The length R of the connecting rod and the rotation angle θ1 generated by the rotation of the connecting rod are known. The line connecting the connecting rod and the initial position 17 of the buoy, the line connecting the connecting rod and the final position 18, and the middle line segment can form a triangle. Based on the rotation angle θ1, the initial position 17, and the final position 18, the included angle θ3 between the connecting rod 13 and the middle line segment can be obtained. Based on the length of the connecting rod, i.e., the first length R, and the rotation angle θ1, the second length d1 of the middle line segment can be obtained. Based on the included angle θ3, the second length d1, and the first length R of the connecting rod, the second displacement d2 of the buoy in the vertical direction can be calculated. Based on the second displacement d2, the liquid level data of the liquid is determined and output, thus completing the liquid level measurement.

[0099] The specific calculation method is as follows:

[0100]

[0101] θ2 = θ1;

[0102] θ4 = θ2 + θ0 - 90;

[0103] θ3 = (180 - θ2) / 2;

[0104] θ5 = θ3 + θ4;

[0105]

[0106] d2 = d1 * sin(θ5);

[0107] In this context, the first displacement generated by the pull line is L1, the length of the connecting rod is R, the radius of the rotating component is r, the length of the line segment between the initial position 17 and the final position 18 of the buoy is d1, the second displacement of the buoy in the vertical direction is d2, θ1 is the rotation angle of the connecting rod, θ3 is the angle between the connecting rod and the intermediate line segment, and θ2, θ4 and θ5 are intermediate quantities calculated, which will not be elaborated here.

[0108] After the liquid level measurement is completed, the liquid level data is sent to the water pump control CPU. After receiving the data, the CPU processes it into speed parameters through logical operations and sends them to the water pump frequency converter. The frequency converter changes the operating power according to the received speed parameters, thereby performing variable speed control and ultimately achieving precise operation of the water pump.

[0109] This disclosure also provides a liquid container, such as... Figure 1 As shown, the device includes a container body 15 and the aforementioned liquid level measuring device. The liquid level detection device is located inside the container body 15 to achieve underwater detection, meet the requirements of immersion detection, and overcome the defect that traditional float level gauges need to be placed at the top of the liquid.

[0110] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A liquid level measuring device for measuring the liquid level of a liquid, characterized in that, The liquid level measuring device includes: The sensor is equipped with a pull wire; A rotating component, connected to the other end of the pull wire, is used to rotate around its rotation axis; A connecting rod, one end of which is fixed to the rotating assembly, and the other end of which extends outward from the rotating assembly; A buoy is connected to the other end of the connecting rod and floats on the surface of the liquid. The buoy moves with the change of the liquid level. The movement of the buoy causes the connecting rod to rotate around the rotation axis of the rotating assembly. At the same time, the movement of the buoy causes the pull line to be displaced through the rotation of the connecting rod and the rotating assembly. A processor is electrically connected to the sensor; the sensor is used to convert the displacement generated by the pull wire into an electrical signal, and the processor determines and outputs the liquid level data of the liquid based on the electrical signal.

2. The liquid level measuring device as described in claim 1, characterized in that, The liquid level measuring device also includes a housing, the sensor and the rotating assembly are disposed inside the housing, the housing is provided with a sealing assembly, and the connecting rod is sealed to the rotating assembly through the sealing assembly.

3. The liquid level measuring device as described in claim 1, characterized in that, The outer diameter of the rotating component is provided with grooves so that the pull wire is wound around the outer diameter of the rotating component, and the rotating component is a turntable.

4. The liquid level measuring device as described in claim 1, characterized in that, The processor includes: The first determining module is used to determine the first displacement generated by the pull wire based on the electrical signal, and to determine the rotation angle of the connecting rod based on the first displacement; The second determining module is used to determine the second displacement of the buoy in the vertical direction based on the rotation angle; An output module is used to determine and output the liquid level data of the liquid based on the second displacement.

5. The liquid level measuring device as described in claim 4, characterized in that, The second determining module includes: The first determining unit is used to determine the included angle between the connecting rod and the intermediate line segment based on the rotation angle, the initial position and the final position of the buoy; the intermediate line segment is the line segment formed by connecting the initial position and the final position; The second determining unit is used to determine the second displacement of the buoy in the vertical direction based on the included angle.

6. A method for measuring liquid level, applied to the liquid level measuring device according to any one of claims 1-5, characterized in that, The measurement method includes: The rotation angle of the connecting rod is determined based on the first displacement of the pull wire; the first displacement is acquired by the sensor. Based on the rotation angle, determine the second displacement of the buoy in the vertical direction; The liquid level data is determined based on the second displacement.

7. The measurement method as described in claim 6, characterized in that, Determining the second vertical displacement of the buoy based on the rotation angle includes: Based on the rotation angle, the initial position and the final position of the buoy, the included angle between the connecting rod and the intermediate line segment is determined; the intermediate line segment is the line segment formed by connecting the initial position and the final position. Based on the included angle, the second displacement of the buoy in the vertical direction is determined.

8. The measurement method as described in claim 7, characterized in that, Determining the second vertical displacement of the buoy based on the included angle includes: Based on the rotation angle and the first length of the connecting rod, determine the second length of the intermediate line segment; Based on the included angle and the second length, the second displacement of the buoy in the vertical direction is determined.

9. The measurement method as described in claim 6, characterized in that, After determining the liquid level data based on the second displacement, the method further includes: Based on the liquid level data, the operating power of the water pump is determined; the water pump is used to discharge liquid.

10. A liquid container, comprising a container body and a liquid level measuring device according to any one of claims 1-5, characterized in that, The liquid level detection device is located inside the container body.

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