Liquid level measuring device and system

Abstract

Embodiments of the present invention provide a liquid level measuring device and system, relating to the field of measurement technology. The liquid level measuring device includes a main control module, a liquid level processing module, and a measurement electrode array. The main control module, the liquid level processing module, and the measurement electrode array are electrically connected in sequence. The measurement electrode array is used to be disposed at the target to be measured; the main control module is used to send a measurement instruction to the liquid level processing module; the liquid level processing module is used to obtain measurement resistance information generated by the measurement electrode array according to the measurement instruction; the liquid level processing module is further used to compare the measurement resistance information with preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module; the main control module is further used to determine the liquid level height information of the target to be measured according to the comparison result. It can accurately and reliably measure the depth of the liquid level without being affected by soil, impurities, crops, etc.

Description

Technical Field

[0001] The present invention relates to the field of measurement technologies, and more particularly, to a liquid level measurement device and system. Background Art

[0002] Currently, the following three measurement schemes are mainly adopted for the water level measurement devices used in irrigation systems: First, the Hall switch type. By the magnet installed on the floating ball sensing the Hall switch at the corresponding height, the water level is determined. However, there are many soils and impurities in the irrigation area, which will cause the floating ball to be stuck by impurities or soil, making the floating ball unable to float, and thus resulting in the problem of unable to measure. Second, the pressure sensor type. By the pressure sensor placed at the bottom of the liquid, the measured pressure is converted into the depth of water. However, due to excessive soil and impurities at the bottom of the irrigation area, the water inlet hole of the pressure sensor will be blocked, affecting the measurement. Third, the ultrasonic sensor. By the time difference between the transmitted ultrasonic wave and the reflected echo, the depth of the liquid level is measured. However, due to the environmental problems in the irrigation area, it is easily interfered by crops or impurities. Therefore, there is an urgent need for a liquid level measurement device that can be free from the interference of soil, impurities, crops, etc. in the irrigation area. Summary of the Invention

[0003] The objectives of the present invention include, for example, providing a liquid level measurement device and system that can accurately and reliably measure the depth of the liquid level without being affected by soil, impurities, crops, etc.

[0004] Embodiments of the present invention may be implemented as follows:

[0005] In a first aspect, an embodiment of the present invention provides a liquid level measurement device, including a main control module, a liquid level processing module, and a measurement electrode array. The main control module, the liquid level processing module, and the measurement electrode array are electrically connected in sequence. The measurement electrode array is used to be arranged at the target to be measured.

[0006] The main control module is used to send a measurement instruction to the liquid level processing module.

[0007] The liquid level processing module is used to obtain the measurement resistance information generated by the measurement electrode array according to the measurement instruction.

[0008] The liquid level processing module is further used to compare the measurement resistance information with the preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module.

[0009] The main control module is further used to determine the liquid level height information of the target to be measured according to the comparison result.

[0010] Second aspect, an embodiment of the present invention provides a liquid level measurement system, including a terminal device and the liquid level measurement device described in any one of the foregoing embodiments, where the terminal device is electrically connected to the liquid level measurement device;

[0011] The terminal device is configured to receive the liquid level height information of the liquid level measurement device.

[0012] The beneficial effects of the embodiments of the present invention include, for example: a liquid level measurement device and system, the liquid level measurement device includes a main control module, a liquid level processing module, and a measurement electrode array, the main control module, the liquid level processing module, and the measurement electrode array are electrically connected in sequence, and the measurement electrode array is configured to be disposed at a target to be measured; the main control module is configured to send a measurement instruction to the liquid level processing module; the liquid level processing module is configured to obtain measurement resistance information generated by the measurement electrode array according to the measurement instruction; the liquid level processing module is further configured to compare the measurement resistance information with preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module; the main control module is further configured to determine the liquid level height information of the target to be measured according to the comparison result. It can be seen that through the measurement resistance information generated by the measurement electrode array, the liquid level height information of the target to be measured can be accurately measured. Since the measurement resistance information generated by the measurement electrode array is not affected by soil, impurities, crops, etc., the liquid level height of the target to be measured can be accurately and reliably measured through the measurement resistance generated by the measurement electrode array. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic structural diagram of a liquid level measurement system provided by an embodiment of the present application;

[0015] Figure 2 It is a schematic structural diagram of a liquid level measurement device provided by an embodiment of the present application;

[0016] Figure 3 It is a schematic structural diagram of a measurement electrode array of a liquid level measurement device provided by an embodiment of the present application;

[0017] Figure 4 It is a schematic circuit diagram of a liquid level measurement device provided by an embodiment of the present application;

[0018] Figure 5 It is a schematic structural diagram of another liquid level measurement device provided by an embodiment of the present application;

[0019] Figure 6 This is a circuit schematic diagram of another liquid level measurement device provided by the embodiments of the present application.

[0020] Icons: 10 - liquid level measurement system; 100 - liquid level measurement device; 110 - main control module; 120 - liquid level processing module; 121 - reference resistor setting unit; 122 - measurement resistor acquisition unit; 123 - comparison unit; 130 - measurement electrode array; 131 - measurement electrode; 140 - communication module; 141 - rectification unit; 142 - power line carrier communication unit; 150 - power supply module; 200 - terminal device; 300 - target to be measured; 310 - upper liquid area; 320 - lower liquid area; U1 - first analog switch; U2 - second analog switch; U3 - comparator; Rc - reference resistor; R1 - first resistor; R2 - second resistor; TP - detection positive electrode; GND - detection negative electrode. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship when the product of the present invention is normally placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0025] In addition, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0026] It should be noted that, without conflict, the features in the embodiments of the present invention may be combined with each other.

[0027] Please refer to Figure 1 , this embodiment provides a liquid level measurement system 10, which includes a terminal device 200 and a liquid level measurement device 100. The terminal device 200 is electrically connected to the liquid level measurement device 100. The terminal device 200 is used to receive the liquid level height information of the liquid level measurement device 100 in a wired or wireless manner.

[0028] In this embodiment, data interaction between the terminal device 200 and the liquid level measurement device 100 can be performed by means such as RS232, RS485, power line carrier, and wireless communication. The terminal device 200 can not only receive the liquid level height information sent by the liquid level measurement device 100, but also send a test instruction to the liquid level measurement device 100. The liquid level measurement device 100 measures the liquid level of the target to be measured according to the test instruction to obtain the liquid level height information.

[0029] Among them, the target to be measured can be a paddy field to be measured, a pond to be measured, etc.

[0030] Please refer to Figure 2 , for Figure 1 a schematic structural diagram of an implementable liquid level measurement device 100 shown in. The liquid level measurement device 100 includes a main control module 110, a liquid level processing module 120, and a measurement electrode array 130. The main control module 110, the liquid level processing module 120, and the measurement electrode array 130 are electrically connected in sequence. The measurement electrode array 130 is used to be arranged at the target to be measured.

[0031] In this embodiment, the main control module 110 is used to send a measurement instruction to the liquid level processing module 120; the liquid level processing module 120 is used to obtain the measurement resistance information generated by the measurement electrode array 130 according to the measurement instruction; the liquid level processing module 120 is further used to compare the measurement resistance information with the preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module 110; the main control module 110 is further used to determine the liquid level height information of the target to be measured according to the comparison result.

[0032] It can be understood that the measurement electrode array 130 can be a measurement metal probe. When the liquid level height of the target to be measured is different, the measurement resistance information generated by the measurement electrode array 130 is different. The liquid level processing module 120 can obtain different comparison results according to different measurement resistance information, and the main control module 110 can determine the liquid level height information of the target 300 to be measured according to different comparison results.

[0033] It can be seen that by measuring the measurement resistance information generated by the measurement electrode array 130, the liquid level height information of the target to be measured can be accurately measured. Since the measurement resistance information generated by the measurement electrode array 130 is not affected by soil, impurities, crops, etc., the liquid level height of the target to be measured can be accurately and reliably measured by measuring the measurement resistance generated by the measurement electrode array 130.

[0034] To further illustrate how to generate different measurement resistance information through the measurement electrode array 130, such as Figure 3 As shown, it is a schematic structural diagram of an implementable measurement electrode array 130. The measurement electrode array 130 includes a plurality of measurement electrodes 131, and the plurality of measurement electrodes 131 are respectively electrically connected to the liquid level processing module 120. The plurality of measurement electrodes 131 are arranged in sequence from bottom to top at the target 300 to be measured according to a preset spacing, and each measurement electrode 131 generates a measurement resistance information correspondingly.

[0035] In this embodiment, the liquid level processing module 120 is configured to sequentially obtain the measurement resistance information generated by each measurement electrode 131 according to a preset order according to a measurement instruction; the liquid level processing module 120 is further configured to sequentially compare each measurement resistance information with the reference resistance information to obtain a comparison result of each measurement resistance information, and send the comparison result of each measurement resistance information to the main control module 110; the main control module 110 is further configured to determine a target measurement electrode according to the comparison result of each measurement resistance information, and obtain the position information of the target measurement electrode; the main control module 110 is further configured to calculate the liquid level height information according to the position information and the preset spacing.

[0036] It can be understood that each measurement electrode 131 includes a detection positive electrode TP and a detection negative electrode GND, that is, one detection positive electrode TP corresponds to one detection negative electrode GND. The measurement resistance information generated by each measurement electrode 131 correspondingly is the resistance value information between a detection positive electrode TP and the corresponding detection negative electrode GND. The magnitude of the measurement resistance information generated by each measurement electrode 131 correspondingly is related to the distance between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 and the conductivity between the detection positive electrode TP and the detection negative electrode GND. The greater the distance between the detection positive electrode TP and the detection negative electrode GND, the greater the value of the measurement resistance information generated by the measurement electrode 131 correspondingly; the higher the conductivity between the detection positive electrode TP and the detection negative electrode GND, the smaller the value of the measurement resistance information generated by the measurement electrode 131 correspondingly.

[0037] In this embodiment, the distance between the detection positive electrode TP and the detection negative electrode GND of each measurement electrode 131 is the same. However, since each measurement electrode 131 is arranged at different positions of the target to be measured 300, the conductivity between the detection positive electrode TP and the detection negative electrode GND of each measurement electrode 131 may be the same, may be similar, or may vary greatly. Therefore, the measurement resistance information generated by the measurement electrodes 131 arranged in the submersible area 320 of the target to be measured 300 should be the same or similar, and the measurement resistance information generated by the measurement electrodes 131 arranged in the above-submersible area 310 of the target to be measured 300 should also be the same or similar. The measurement resistance information generated by the measurement electrodes 131 arranged in the submersible area 320 of the target to be measured 300 should be very different from the measurement resistance information generated by the measurement electrodes 131 arranged in the above-submersible area 310 of the target to be measured 300.

[0038] In this embodiment, a plurality of measurement electrodes 131 are arranged in sequence from bottom to top at the target to be measured 300 at a preset interval. It can be understood that a plurality of measurement electrodes 131 are arranged in sequence from bottom to top from the bottom of the submersible area 320 of the target to be measured 300 to the above-submersible area 310 of the target to be measured 300 at a preset interval. Since the measurement resistance information generated by the measurement electrodes 131 arranged in the submersible area 320 of the target to be measured 300 should be the same or similar, and the measurement resistance information generated by the measurement electrodes 131 arranged in the above-submersible area 310 of the target to be measured 300 should also be the same or similar. The measurement resistance information generated by the measurement electrodes 131 arranged in the submersible area 320 of the target to be measured 300 should be very different from the measurement resistance information generated by the measurement electrodes 131 arranged in the above-submersible area 310 of the target to be measured 300. For the convenience of identification and measurement, the preset order based on by the liquid level processing module 120 may be to sequentially obtain the measurement resistance information corresponding to each measurement electrode 131 from bottom to top starting from the measurement electrode 131 arranged at the bottom of the submersible area 320; or the preset order based on by the liquid level processing module 120 may also be to sequentially obtain the measurement resistance information corresponding to each measurement electrode 131 from top to bottom starting from the measurement electrode 131 arranged at the top of the above-submersible area 310.

[0039] Since the measurement resistance information generated by the measurement electrodes 131 arranged in the submerged area 320 at the target 300 to be measured should be the same or similar, and the measurement resistance information generated by the measurement electrodes 131 arranged in the above-liquid area 310 at the target 300 to be measured should also be the same or similar, while the measurement resistance information generated by the measurement electrodes 131 arranged in the submerged area 320 at the target 300 to be measured should be very different from the measurement resistance information generated by the measurement electrodes 131 arranged in the above-liquid area 310 at the target 300 to be measured. Therefore, the comparison results corresponding to the measurement electrodes 131 arranged in the above-liquid area 310 at the target 300 should be the same under normal circumstances, the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 320 at the target 300 should be the same under normal circumstances, and the comparison results corresponding to the measurement electrodes 131 arranged in the above-liquid area 310 at the target 300 should be different from the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 320 at the target 300 under normal circumstances. The main control module 110 can determine the target measurement electrode based on the change of the comparison results. The target measurement electrode can be the measurement electrode 131 at the top of the submerged area 320 or the measurement electrode 131 at the bottom of the above-liquid area 310, that is, the target measurement electrode is the measurement electrode 131 at the junction of the above-liquid area 310 and the submerged area 320.

[0040] The main control module 110 can determine the position information of the target measurement electrode according to the number of comparison results before determining the target measurement electrode. The position information can be the arrangement order of the target measurement electrode, or the number of measurement electrodes 131 arranged in the submerged area 320 or the number of measurement electrodes 131 arranged in the above-liquid area 310. The main control module 110 multiplies the position information by the preset spacing to calculate the liquid level height information.

[0041] For example, the preset order based on by the liquid level processing module 120 can start from the measurement electrode 131 at the bottom of the submerged area 320, and sequentially obtain the measurement resistance information corresponding to each measurement electrode 131 from bottom to top. If the first five comparison results obtained by the liquid level processing module 120 are all the same (for example, the measurement resistance information is less than the reference resistance information), the sixth comparison result obtained by the liquid level processing module 120 (for example, the measurement resistance information is greater than the reference resistance information) is different from the fifth comparison result, or the sixth comparison result obtained by the liquid level processing module 120 is different from the previous five comparison results. Then the main control module 110 determines the measurement electrode corresponding to the fifth comparison result as the target measurement electrode and obtains the position information with the sorting of 5 of the target measurement electrode. The main control module 110 multiplies the sorting 5 by the preset spacing to calculate the liquid level height information.

[0042] In this embodiment, the measurement resistance information generated corresponding to each measurement electrode 131 can not only be used to measure the liquid level depth of the target to be measured 300, but also be used to detect whether there is an abnormal measurement electrode among the multiple measurement electrodes 131. The specific working principle is as follows: The main control module 110 is further configured to determine whether there is an abnormal measurement electrode among the multiple measurement electrodes 131 according to the comparison results of each measurement resistance information.

[0043] Specifically, since the target to be measured 300 includes a liquid upper region 310 and a liquid lower region 320, the multiple measurement electrodes 131 are arranged in sequence from bottom to top at preset intervals in the liquid lower region 320 and the liquid upper region 310. Among them, the liquid upper region 310 can be understood as the region above the liquid surface at the target to be measured 300, and the liquid lower region 320 can be understood as the region below the liquid surface at the target to be measured 300. The main control module 110 is further configured to determine the measurement electrodes 131 arranged in the liquid upper region 310 and the measurement electrodes 131 arranged in the liquid lower region 320 according to the comparison results of each measurement resistance information; the main control module 110 is further configured to determine whether there is an abnormal measurement electrode among the measurement electrodes 131 arranged in the liquid upper region 310 according to whether the comparison results corresponding to the measurement electrodes 131 arranged in the liquid upper region 310 are consistent; the main control module 110 is further configured to determine whether there is an abnormal measurement electrode among the measurement electrodes 131 arranged in the liquid lower region 320 according to whether the comparison results corresponding to the measurement electrodes 131 arranged in the liquid lower region 320 are consistent.

[0044] It can be understood that since the liquid upper region 310 is the region above the liquid surface at the target to be measured 300, the value corresponding to the measurement resistance information generated by the measurement electrode 131 arranged in the liquid upper region 310 is equivalent to infinity, that is, it is equivalent to an open circuit between the positive and negative electrodes of the measurement electrode 131 arranged in the liquid upper region 310. And the liquid lower region 320 is the region below the liquid surface at the target to be measured 300. Because the liquid has conductivity, the value corresponding to the measurement resistance information generated by the measurement electrode 131 arranged in the liquid lower region 320 generally falls within a fixed value. Since the value corresponding to the measurement resistance information generated by the measurement electrode 131 arranged in the liquid lower region 320 is also related to the distance between the positive and negative electrodes of the measurement electrode 131, and the conductivity of the liquid is related to the composition of the liquid. If the liquid is pure water, the fixed value is generally 500 KΩ. If the liquid is farm irrigation water, well water or rainwater, the conductivity is higher and the fixed value will be smaller. Therefore, the reference resistance information can be set according to the fixed value.

[0045] Therefore, if the comparison result of comparing the measured resistance information corresponding to the measurement electrode 131 with the reference resistance information shows that the measured resistance information is greater than the reference resistance information, it indicates that the measurement electrode 131 is arranged in the liquid upper region 310. If the comparison result of comparing the measured resistance information corresponding to the measurement electrode 131 with the reference resistance information shows that the measured resistance information is less than the reference resistance information, it also indicates that the measurement electrode 131 is arranged in the liquid upper region 310.

[0046] Since there is a situation where the measurement electrode 131 in the liquid upper region 310 is connected by a conductive object (such as a wire), the measured resistance information corresponding to the measurement electrode 131 arranged in the liquid upper region 310 may be less than the reference resistance information. However, only a few measurement electrodes 131 are connected by conductive objects. Therefore, there will still be more comparison results where the measured resistance information corresponding to the measurement electrode 131 in the liquid upper region 310 is greater than the reference resistance information. If the measurement electrode 131 connected by a conductive object is arranged in the middle position of the measurement electrodes 131 in the liquid upper region 310, the main control module 110 determines that there is an abnormal measurement electrode in the liquid upper region 310 based on the situation of first receiving multiple comparison results where the measured resistance information is greater than the reference resistance information, then receiving a comparison result where the measured resistance information is less than the reference resistance information, and finally receiving multiple comparison results where the measured resistance information is greater than the reference resistance information. If the measurement electrode 131 connected by a conductive object is arranged at the topmost position of the measurement electrodes 131 in the liquid upper region 310, the main control module 110 determines that there is an abnormal measurement electrode in the liquid upper region 310 based on the situation of first receiving multiple comparison results where the measured resistance information is greater than the reference resistance information and then receiving a comparison result where the measured resistance information is less than the reference resistance information.

[0047] Since the measurement electrode 131 in the submersible area 320 is surrounded by an insulating object (such as glue), the measurement resistance information corresponding to the measurement electrode 131 arranged in the submersible area 320 may be greater than the reference resistance information. However, only a small number of measurement electrodes 131 are connected by conductive objects, so there will still be more comparison results where the measurement resistance information corresponding to the measurement electrodes 131 in the submersible area 320 is less than the reference resistance information. If the measurement electrode 131 surrounded by the insulating object is arranged in the middle position of the measurement electrodes 131 in the submersible area 320, the main control module 110 determines that there is an abnormal measurement electrode in the submersible area 320 based on the situation of first receiving multiple comparison results where the measurement resistance information is less than the reference resistance information, then receiving a comparison result where the measurement resistance information is greater than the reference resistance information, and finally receiving multiple comparison results where the measurement resistance information is less than the reference resistance information. If the measurement electrode 131 surrounded by the insulating object is arranged at the bottommost position of the measurement electrodes 131 in the submersible area 320, the main control module 110 determines that there is an abnormal measurement electrode in the submersible area 320 based on the situation of first receiving a comparison result where the measurement resistance information is greater than the reference resistance information and then receiving multiple comparison results where the measurement resistance information is less than the reference resistance information.

[0048] At the same time, the main control module 110 will also report the abnormal information of the existence of the abnormal measurement electrode to the terminal device 200 so that the user can process the abnormal measurement electrode in time.

[0049] To further illustrate how to measure the liquid level height information of the target to be measured 300 through the measurement electrode array 130, as Figure 4 shown, it is a schematic circuit diagram of an implementable liquid level measurement device 100 provided by an embodiment of the present application. The liquid level processing module 120 includes a reference resistance setting unit 121, a measurement resistance acquisition unit 122, and a comparison unit 123. The reference resistance setting unit 121 is electrically connected to the comparison unit 123. The measurement resistance acquisition unit 122 is electrically connected to the main control module 110, the comparison unit 123, and the measurement electrode array 130. The comparison unit 123 is electrically connected to the main control module 110.

[0050] In this embodiment, the reference resistance setting unit 121 is used to provide reference resistance information to the comparison unit 123; the measurement resistance acquisition unit 122 is used to obtain measurement resistance information according to a measurement instruction; the comparison unit 123 is used to compare the measurement resistance information with the reference resistance information to obtain a comparison result and send the comparison result to the main control module 110.

[0051] Furthermore, the reference resistance setting unit 121 may also be electrically connected to the main control module 110; the main control module 110 is also used to send a setting instruction to the reference resistance setting unit 121; the reference resistance setting unit 121 is also used to adjust the reference resistance information according to the setting instruction.

[0052] Further, the reference resistance setting unit 121 includes a first analog switch U1 and a plurality of reference resistors Rc. The control pin of the first analog switch U1 is electrically connected to the main control module 110. A plurality of selection pins of the first analog switch U1 are respectively and electrically connected to the plurality of reference resistors Rc one by one. The output pin of the first analog switch U1 is electrically connected to the comparison unit 123. The resistance values of the plurality of reference resistors Rc are different. The first analog switch U1 is configured to select one selection pin from the plurality of selection pins of the first analog switch U1 to communicate with the output pin of the first analog switch U1 according to a setting instruction, thereby adjusting the reference resistance information and transmitting the adjusted reference resistance information to the comparison unit 123.

[0053] It can be understood that the reference resistance information is adjustable before or during actual use. By the setting instruction sent by the main control module 110, one selection pin from the plurality of selection pins of the first analog switch U1 can be selected to communicate with the output pin of the first analog switch U1, and the adjusted reference resistance information is provided to the comparator U3 according to the reference resistor Rc connected to the selection pin communicating with the output pin of the first analog switch U1. The setting instruction can be a string. For example, if it is necessary to select the first selection pin of the first analog switch U1 to communicate with the output pin of the first analog switch U1, the setting instruction can be set to 1000; if it is necessary to select the second selection pin of the first analog switch U1 to communicate with the output pin of the first analog switch U1, the setting instruction can be set to 0100.

[0054] In this embodiment, if the staff does not know what the fixed value is, the magnitude of the reference resistance information cannot be set by the fixed value. Then, before the test, the staff can control the selection pin electrically connected to the reference resistance Rc with the smallest resistance value to communicate with the output pin of the first analog switch U1 through the operation of the main control module 110 to obtain the smallest reference resistance information. If the values of multiple reference resistances Rc are correspondingly set to 16K, 91K, 169K, 243K, 324K, 392K, 470K, 549K, 620K, 698K, 768K, 845K, 931K, etc., then the smallest reference resistance information corresponds to 16K. The staff then operates the main control module 110 to control the measurement resistance acquisition unit 122 to acquire the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320. The comparison unit 123 compares the smallest reference resistance information with the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320. If the comparison result shows that the smallest reference resistance information is less than the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320, it means that the value of the reference resistance information is selected too small and the liquid level measurement cannot be performed. Therefore, the staff can control the selection pin electrically connected to the reference resistance Rc with a larger resistance value to communicate with the output pin of the first analog switch U1 through the operation of the main control module 110 to obtain larger reference resistance information. The comparison unit 123 compares the larger reference resistance information with the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320. If the comparison result shows that the larger reference resistance information is greater than the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320, it means that the value of the larger reference resistance information is appropriately selected; if the comparison result shows that the larger reference resistance information is still less than the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320, it means that the value of the larger reference resistance information is still selected too small, and a larger reference resistance information needs to be selected again to be compared with the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320 until a comparison result that the reference resistance information is greater than the measurement resistance information generated by the measurement electrode 131 at the bottom of the liquid area 320 is obtained.

[0055] Of course, in another embodiment, the value of the reference resistance information can also be set by averaging the value of the measurement resistance information generated by the measurement electrode 131 in the liquid area 320 and the value of the measurement resistance information generated by the measurement electrode 131 in the upper liquid area 310, and taking the average value of the value of the measurement resistance information generated by the measurement electrode 131 in the liquid area 320 and the value of the measurement resistance information generated by the measurement electrode 131 in the upper liquid area 310 as the value of the reference resistance information. Of course, other methods can also be used to select the value of the reference resistance information, which is not limited here.

[0056] In this embodiment, since the above-liquid region 310 includes a dry region and a wet region, the wet region can be understood as the humid region on the measurement electrode array 130 after the liquid level of the target to be measured 300 drops. Although the conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the wet region is greater than that between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the dry region, the conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the wet region is much smaller than that between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the below-liquid region 320. Therefore, the measurement resistance information of the measurement electrode 131 arranged in the wet region is much greater than the measurement resistance information of the measurement electrode 131 arranged in the below-liquid region 320, and the measurement resistance information of the measurement electrode 131 arranged in the dry region is much greater than the measurement resistance information of the measurement electrode 131 arranged in the wet region. So, the reference resistance information set in this application is also smaller than the measurement resistance information of the measurement electrode 131 arranged in the wet region.

[0057] Further, as Figure 4 shown, the measurement resistance acquisition unit 122 includes a second analog switch U2. The control pin of the second analog switch U2 is electrically connected to the main control module 110. Multiple selection pins of the second analog switch U2 are respectively electrically connected to the measurement electrode array 130. The output pin of the second analog switch U2 is electrically connected to the comparison unit 123. The second analog switch U2 is configured to select one of the multiple selection pins of the second analog switch U2 to be connected to the output pin of the second analog switch U2 according to a measurement instruction, so as to obtain measurement resistance information and transmit the measurement resistance information to the comparison unit 123.

[0058] It can be understood that multiple second analog switches U2 can be provided and specifically set according to the number of measurement electrodes 131. Among them, the selection pins of the second analog switch U2 can be respectively electrically connected to the detection positive electrode TP of the measurement electrode 131.

[0059] In this embodiment, the second analog switch U2 can sequentially obtain the measurement resistance information generated by each measurement electrode 131 according to a measurement instruction, and the order of the measurement resistance information of the sequentially obtained measurement electrodes 131 should be the measurement resistance information generated by the measurement electrodes 131 arranged from bottom to top on the target to be measured 300. That is, the measurement resistance information generated by the measurement electrode 131 at the bottom of the target to be measured 300 is obtained first.

[0060] Further, as Figure 4As shown in the figure, the comparison unit 123 includes a comparator U3, a first resistor R1, and a second resistor R2. The first resistor R1 is electrically connected to the reference resistor setting unit 121, and the second resistor R2 is electrically connected to the measurement resistor obtaining unit 122. The non-inverting input terminal of the comparator U3 is electrically connected between the second resistor R2 and the measurement resistor obtaining unit 122, the inverting input terminal of the comparator U3 is electrically connected between the first resistor R1 and the reference resistor setting unit 121, and the output terminal of the comparator U3 is electrically connected to the main control module 110. The comparator U3 is configured to compare the measurement resistor information with the reference resistor information to obtain a comparison result and send the comparison result to the main control module 110.

[0061] It can be understood that the non-inverting input terminal of the comparator U3 is electrically connected between the second resistor R2 and the output pin of the second analog switch U2, and the inverting input terminal of the comparator U3 is electrically connected between the first resistor R1 and the output pin of the first analog switch U1. The non-inverting input terminal of the comparator U3 is used to obtain the measurement resistor information, and the inverting input terminal of the comparator U3 is used to obtain the reference resistor information. The comparator U3 compares the measurement resistor information with the reference resistor information. If the measurement resistor information is greater than the reference resistor information, the output terminal of the comparator U3 will generate a comparison result with a high level; if the measurement resistor information is less than the reference resistor information, the output terminal of the comparator U3 will generate a comparison result with a low level.

[0062] Further, as Figure 5 shown, it is another implementable structural schematic diagram of the liquid level measuring device 100 provided by the embodiment of the present application. On the basis of the liquid level measuring device 100 shown in Figure 3 the figure, Figure 5 the liquid level measuring device 100 shown in the figure further includes a communication module 140, and the main control module 110 is electrically connected to the terminal device 200 through the communication module 140. The main control module 110 is further configured to transmit the liquid level height information to the terminal device 200 through the communication module 140.

[0063] In this embodiment, the communication module 140 can be an RS232 communication module, an RS485 communication module, a power line carrier communication module, a wireless communication module, etc.

[0064] In this embodiment, the communication module 140 is preferably set as a power line carrier communication module. As Figure 6 shown, it is an implementable circuit schematic diagram of the communication module 140 being a power line carrier communication module. The communication module 140 includes a rectification unit 141 and a power line carrier communication unit 142. The rectification unit 141 is electrically connected to the terminal device 200, and the rectification unit 141 is also electrically connected to both the power line carrier communication unit 142 and the power supply module 150. The power line carrier communication unit 142 is also electrically connected to the main control module 110.

[0065] In this embodiment, the rectification unit 141 is configured to rectify the power supply voltage provided by the terminal device 200 to obtain the rectified power supply voltage, and transmit the rectified power supply voltage to the power supply module 150 and the power line communication unit 142 respectively; the power line communication unit 142 is configured to receive the liquid level height information sent by the main control module 110 and transmit the liquid level height information to the terminal device 200.

[0066] It can be understood that the power line communication unit 142 includes a third resistor R3, a fourth resistor R4, a first switching transistor Q1, and a power line receiving chip U4. The third resistor R3 and the fourth resistor R4 are connected in series between the rectification unit 141 and the ground wire. The receiving pin of the power line receiving chip U4 is electrically connected between the third resistor R3 and the fourth resistor R4. The serial port pin of the power line receiving chip U4 is electrically connected to the main control module 110. The transmitting pin of the power line receiving chip U4 is electrically connected to the first pin of the first switching transistor. The second pin of the first switching transistor Q1 is electrically connected between the rectification unit 141 and the power supply module 150, and the third pin of the first switching transistor Q1 is electrically connected to the ground wire.

[0067] Among them, after voltage division by the third resistor R3 and the fourth resistor R4, the test instruction sent by the terminal device 200 can be obtained. The main control module 110 controls the on / off of the first switching transistor through the power line receiving chip U4, and can report the liquid level height information and abnormal information to the terminal device 200.

[0068] In this embodiment, the rectification unit 141 includes a ceramic discharge tube GDT1, a resettable fuse F1, a TVS tube D1, and a rectifier bridge D2. The ceramic discharge tube GDT1, the resettable fuse F1, and the TVS tube D1 form a lightning protection circuit. The rectifier bridge D2 is used to realize non-polar power supply for the terminal device 200, which is convenient for layout and at the same time avoids short-circuit faults caused by reverse connection.

[0069] As Figure 5 shown, the liquid level measuring device 100 further includes a power supply module 150. The communication module 140 is electrically connected to both the main control module 110 and the liquid level processing module 120 through the power supply module 150. The communication module 140 is configured to receive the power supply voltage provided by the terminal device 200 and transmit the power supply voltage to the power supply module 150; the power supply module 150 is configured to convert the power supply voltage to obtain the working voltage and provide the working voltage to the main control module 110 and the liquid level processing module 120.

[0070] In this embodiment, the power supply module 150 includes at least one DC voltage conversion chip, and the power supply voltage can be stepped down to multiple working voltages of different magnitudes through the at least one DC voltage conversion chip.

[0071] In summary, the embodiments of the present invention provide a liquid level measuring device and system. The liquid level measuring device includes a main control module, a liquid level processing module, and a measuring electrode array. The main control module, the liquid level processing module, and the measuring electrode array are electrically connected in sequence. The measuring electrode array is used to be disposed at the target to be measured. The main control module is used to send a measurement instruction to the liquid level processing module. The liquid level processing module is used to obtain the measurement resistance information generated by the measuring electrode array according to the measurement instruction. The liquid level processing module is further used to compare the measurement resistance information with the preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module. The main control module is further used to determine the liquid level height information of the target to be measured according to the comparison result. It can be seen that the liquid level height information of the target to be measured can be accurately measured through the measurement resistance information generated by the measuring electrode array. Since the measurement resistance information generated by the measuring electrode array is not affected by soil, impurities, crops, etc., the liquid level height of the target to be measured can be accurately and reliably measured through the measurement resistance generated by the measuring electrode array.

[0072] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A liquid level measuring device, characterized in that, It includes a main control module, a liquid level processing module and a measurement electrode array. The main control module, the liquid level processing module and the measurement electrode array are electrically connected in sequence. The measurement electrode array is used to be arranged at the target to be measured. The main control module is used to send a measurement instruction to the liquid level processing module. The liquid level processing module is used to obtain the measurement resistance information generated by the measurement electrode array according to the measurement instruction. The liquid level processing module is also used to compare the measurement resistance information with the preset reference resistance information to obtain a comparison result, and send the comparison result to the main control module. The main control module is also used to determine the liquid level height information of the target to be measured according to the comparison result. The liquid level measuring device also includes a communication module. The main control module is electrically connected to the terminal device through the communication module. The main control module is also used to transmit the liquid level height information to the terminal device through the communication module. The communication module includes a rectification unit and a power line carrier communication unit. The rectification unit is electrically connected to the terminal device. The power line carrier communication unit includes a third resistor, a fourth resistor, a first switching tube and a power line carrier receiving chip. The third resistor and the fourth resistor are connected in series between the rectification unit and the ground wire. The receiving pin of the power line carrier receiving chip is electrically connected between the third resistor and the fourth resistor. The serial port pin of the power line carrier receiving chip is electrically connected to the main control module. The sending pin of the power line carrier receiving chip is electrically connected to the first pin of the first switching tube. The second pin of the first switching tube is electrically connected between the rectification unit and the power supply module. The third pin of the first switching tube is electrically connected to the ground wire. The liquid level processing module includes a reference resistance setting unit, a measurement resistance obtaining unit and a comparison unit. The reference resistance setting unit is electrically connected to the comparison unit. The measurement resistance obtaining unit is electrically connected to the main control module, the comparison unit and the measurement electrode array. The comparison unit is electrically connected to the main control module. The reference resistance setting unit is used to provide the reference resistance information to the comparison unit. The measurement resistance obtaining unit is used to obtain the measurement resistance information according to the measurement instruction. The comparison unit is used to compare the measurement resistance information with the reference resistance information to obtain a comparison result, and send the comparison result to the main control module. The measurement resistance obtaining unit includes a second analog switch. The control pin of the second analog switch is electrically connected to the main control module. Multiple selection pins of the second analog switch are respectively electrically connected to the measurement electrode array. The output pin of the second analog switch is electrically connected to the comparison unit. The second analog switch is used to select one of the multiple selection pins of the second analog switch to be connected to the output pin of the second analog switch according to the measurement instruction, so as to obtain the measurement resistance information and transmit the measurement resistance information to the comparison unit.

2. The liquid level measuring device according to claim 1, wherein, The measurement electrode array includes a plurality of measurement electrodes, and the plurality of measurement electrodes are respectively electrically connected to the liquid level processing module. The plurality of measurement electrodes are arranged from bottom to top at the target to be measured at a preset interval, and each measurement electrode generates a measurement resistance information correspondingly; The liquid level processing module is configured to sequentially obtain the measurement resistance information generated by each measurement electrode in a preset order according to the measurement instruction; The liquid level processing module is further configured to sequentially compare each measurement resistance information with the reference resistance information to obtain a comparison result of each measurement resistance information, and send the comparison result of each measurement resistance information to the main control module; The main control module is further configured to determine a target measurement electrode according to the comparison result of each measurement resistance information, and obtain the position information of the target measurement electrode; The main control module is further configured to calculate the liquid level height information according to the position information and the preset interval; 3. The liquid level measuring device according to claim 2, wherein, The main control module is further configured to determine whether there is an abnormal measurement electrode among the plurality of measurement electrodes according to the comparison result of each measurement resistance information; 4. The liquid level measuring device according to claim 3, characterized in that, The target to be measured includes a liquid upper region and a liquid lower region, and the plurality of measurement electrodes are arranged from bottom to top at a preset interval in the liquid lower region and the liquid upper region; The main control module is further configured to determine the measurement electrodes arranged in the liquid upper region and the measurement electrodes arranged in the liquid lower region according to the comparison result of each measurement resistance information; The main control module is further configured to determine whether there is an abnormal measurement electrode among the measurement electrodes arranged in the liquid upper region according to whether the comparison results corresponding to the measurement electrodes arranged in the liquid upper region are consistent; The main control module is further configured to determine whether there is an abnormal measurement electrode among the measurement electrodes arranged in the liquid lower region according to whether the comparison results corresponding to the measurement electrodes arranged in the liquid lower region are consistent; 5. The liquid level measuring device according to claim 1, wherein The reference resistance setting unit is also electrically connected to the main control module; The main control module is further configured to send a setting instruction to the reference resistance setting unit; The reference resistance setting unit is further configured to adjust the reference resistance information according to the setting instruction; 6. The liquid level measuring device according to claim 5, characterized in that The reference resistance setting unit includes a first analog switch and a plurality of reference resistors. The control pin of the first analog switch is electrically connected to the main control module. The plurality of selection pins of the first analog switch are respectively electrically connected to the plurality of reference resistors in one-to-one correspondence. The output pin of the first analog switch is electrically connected to the comparison unit, and the resistance values of the plurality of reference resistors are different; The first analog switch is configured to select one of the plurality of selection pins of the first analog switch to be connected to the output pin of the first analog switch according to the setting instruction, thereby adjusting the reference resistance information, and transmitting the adjusted reference resistance information to the comparison unit.

7. The liquid level measuring device according to claim 5, characterized in that, The comparison unit includes a comparator, a first resistor, and a second resistor. The first resistor is electrically connected to the reference resistor setting unit, the second resistor is electrically connected to the measurement resistor obtaining unit, the non-inverting input terminal of the comparator is electrically connected between the second resistor and the measurement resistor obtaining unit, the inverting input terminal of the comparator is electrically connected between the first resistor and the reference resistor setting unit, and the output terminal of the comparator is electrically connected to the main control module; The comparator is configured to compare the measurement resistor information with the reference resistor information to obtain a comparison result and send the comparison result to the main control module.

8. The liquid level measuring device according to claim 1, characterized in that, The liquid level measuring device further includes a power supply module. The communication module is electrically connected to both the main control module and the liquid level processing module through the power supply module; The communication module is configured to receive the power supply voltage provided by the terminal device and transmit the power supply voltage to the power supply module; The power supply module is configured to convert the power supply voltage to obtain a working voltage and provide the working voltage to the main control module and the liquid level processing module.

9. A liquid level measurement system, characterized in that, It includes a terminal device and the liquid level measuring device according to any one of claims 1-8, and the terminal device is electrically connected to the liquid level measuring device; The terminal device is configured to receive the liquid level height information of the liquid level measuring device.

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