CN212378853U - Liquid level measuring device and system - Google Patents

Abstract

An embodiment of the utility model provides a liquid level measuring device and system relates to and measures technical field. The liquid level measuring device comprises a main control module, a liquid level processing module and a measuring electrode array, wherein the main control module, the liquid level processing module and the measuring electrode array are sequentially and electrically connected, and the measuring electrode array is used for being arranged at a target to be measured; the main control module is used for sending a measurement instruction to the liquid level processing module; the liquid level processing module is used for acquiring measurement resistance information generated by the measurement electrode array according to the measurement instruction; the liquid level processing module is also used for comparing the measured resistance information with preset reference resistance information to obtain a comparison result and sending the comparison result to the main control module; the main control module is also used for determining the liquid level height information of the target to be detected according to the comparison result. The depth of the liquid level can be accurately and reliably measured without being influenced by soil, impurities, crops and the like.

Description

Liquid level measuring device and system

Technical Field

The utility model relates to a measure technical field, particularly, relate to a liquid level measurement device and system.

Background

The water level measuring device for the irrigation system mainly adopts the following three measuring schemes: the first kind, hall switch formula senses the hall switch of corresponding height through the magnet of dress at the floater to confirm the water level, nevertheless irrigate the earth and the impurity in district more, can lead to the floater to be stained with by impurity or earth, make the floater float, and then produce the problem of unable measurement. The second, the pressure sensor formula, through putting the pressure sensor in the liquid bottom, measuring pressure converts the degree of depth into water, nevertheless has too much earth and impurity because of irrigating the district bottom, can plug pressure sensor's inlet opening, influences the measurement. The third is an ultrasonic sensor, which measures the depth of the liquid level by the time difference between the transmitted ultrasonic waves and the reflected echoes, but is easily interfered by crops or impurities due to the environmental problems of the irrigation area. Therefore, a liquid level measuring device which is not interfered by soil, impurities, crops and the like in an irrigation area is needed.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model includes, for example, provide a liquid level measurement device and system, it can not receive influences such as earth, impurity and crops, the degree of depth of accurate, reliable measurement liquid level.

The embodiment of the utility model discloses a can realize like this:

in a first aspect, an embodiment of the present invention provides a liquid level measuring device, including a main control module, a liquid level processing module and a measuring electrode array, where the main control module, the liquid level processing module and the measuring electrode array are electrically connected in sequence, and the measuring electrode array is used for being disposed at a target to be measured;

the main control module is used for sending a measurement instruction to the liquid level processing module;

the liquid level processing module is used for acquiring measurement resistance information generated by the measurement electrode array according to the measurement instruction;

the liquid level processing module is also used for comparing the measured resistance information with preset reference resistance information to obtain a comparison result and sending the comparison result to the main control module;

and the main control module is also used for determining the liquid level height information of the target to be detected according to the comparison result.

In a second aspect, an embodiment of the present invention provides a liquid level measuring system, including a terminal device and a liquid level measuring device as described in any one of the foregoing embodiments, where the terminal device is electrically connected to the liquid level measuring device;

and the terminal equipment is used for receiving the liquid level height information of the liquid level measuring device.

The utility model discloses beneficial effect includes, for example: a liquid level measuring device and a system thereof, the liquid level measuring device comprises 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 sequentially and electrically connected, and the measuring electrode array is used for being arranged at a target to be measured; the main control module is used for sending a measurement instruction to the liquid level processing module; the liquid level processing module is used for acquiring measurement resistance information generated by the measurement electrode array according to the measurement instruction; the liquid level processing module is also used for comparing the measured resistance information with preset reference resistance information to obtain a comparison result and sending the comparison result to the main control module; the main control module is also used for determining the liquid level height information of the target to be detected according to the comparison result. Therefore, the liquid level height information of the target to be measured can be accurately measured and obtained through measuring resistance information generated by the electrode array. Because the measuring resistance information generated by the measuring electrode array is not influenced by soil, impurities, crops and the like, the liquid level height of the target to be measured can be accurately and reliably measured through the measuring resistance generated by the measuring electrode array.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a liquid level measuring system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a liquid level measuring device according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a measuring electrode array of a liquid level measuring device according to an embodiment of the present disclosure;

FIG. 4 is a schematic circuit diagram of a liquid level measuring device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another liquid level measuring device provided by the embodiment of the present application;

FIG. 6 is a schematic circuit diagram of another liquid level measurement device provided in the embodiments of the present application.

Icon: 10-a liquid level measuring system; 100-a liquid level measuring device; 110-a master control module; 120-a liquid level processing module; 121-reference resistance setting unit; 122-a measured resistance obtaining unit; 123-a comparison unit; 130-a measurement electrode array; 131-a measuring electrode; 140-a communication module; 141-a rectifying unit; 142-a power carrier communication unit; 150-a power supply module; 200-a terminal device; 300-a target to be detected; 310-the upper liquid zone; 320-the submerged region; u1 — first analog switch; u2 — second analog switch; u3-comparator; rc-reference resistance; r1 — first resistance; r2 — second resistance; TP-detecting the positive electrode; GND-probe negative.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1, the present embodiment provides a liquid level measuring system 10, the liquid level measuring system 10 includes a terminal device 200 and a liquid level measuring apparatus 100, and the terminal device 200 is electrically connected to the liquid level measuring apparatus 100. The terminal device 200 is used for receiving the liquid level height information of the liquid level measuring device 100 in a wired or wireless mode.

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

The target to be detected can be a paddy field to be detected, a pond to be detected and the like.

Fig. 2 is a schematic diagram of an implementation of the liquid level measuring apparatus 100 shown in fig. 1. The liquid level measuring device 100 includes a main control module 110, a liquid level processing module 120 and a measuring electrode array 130, wherein the main control module 110, the liquid level processing module 120 and the measuring electrode array 130 are electrically connected in sequence, and the measuring electrode array 130 is used for being disposed at a target to be measured.

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

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

Therefore, the liquid level height information of the target to be measured can be accurately measured and obtained through the measurement resistance information generated by the measurement electrode array 130. Because the measuring resistance information generated by the measuring electrode array 130 is not influenced by soil, impurities, crops and the like, the liquid level height of the target to be measured can be accurately and reliably measured through the measuring resistance generated by the measuring electrode array 130.

To further illustrate how different measured resistance information may be generated by the measuring electrode array 130, fig. 3 is a schematic diagram of an implementable structure of the measuring electrode array 130. The measuring electrode array 130 comprises a plurality of measuring electrodes 131, the plurality of measuring electrodes 131 are respectively electrically connected with the liquid level processing module 120, the plurality of measuring electrodes 131 are sequentially arranged at the target 300 to be measured from bottom to top according to a preset interval, and each measuring electrode 131 correspondingly generates measuring resistance information.

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

It is understood that each of the measuring electrodes 131 includes a detecting positive electrode TP and a detecting negative electrode GND, i.e., one detecting positive electrode TP corresponds to one detecting negative electrode GND. The measurement resistance information generated corresponding to each measurement electrode 131 is resistance value information between one detection positive electrode TP and the corresponding detection negative electrode GND. The magnitude of the measurement resistance information generated by each measurement electrode 131 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 larger the distance between the detection positive electrode TP and the detection negative electrode GND, the larger the value of the measurement resistance information generated by the measurement electrode 131, and 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.

In the present embodiment, the distance between the detection positive electrode TP and the detection negative electrode GND of each measurement electrode 131 is the same, but since each measurement electrode 131 is arranged at a different position of the object 300 to be measured, 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 be greatly different. Therefore, the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be the same or similar, the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured should be the same or similar, and the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be greatly different from the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured.

In the present embodiment, the plurality of measuring electrodes 131 are sequentially arranged at the object 300 to be measured from bottom to top at a preset interval, which can be understood as that the plurality of measuring electrodes 131 are sequentially arranged at the upper liquid region 310 of the object 300 to be measured from bottom to top at the bottom of the lower liquid region 320 of the object 300 to be measured at a preset interval. Since the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be the same or similar, and the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured should be the same or similar, the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be much different from the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured. For the convenience of identification and measurement, the preset sequence according to which the liquid level processing module 120 obtains the measurement resistance information corresponding to each measurement electrode 131 from bottom to top sequentially from the measurement electrodes 131 arranged at the bottom of the submerged region 320; or the liquid level processing module 120 may also obtain the measured resistance information corresponding to each measuring electrode 131 from the measuring electrodes 131 arranged at the top of the submerged upper region 310 in turn from top to bottom according to the preset sequence.

Since the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be the same or similar, and the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured should be the same or similar, the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be much different from the information on the measured resistance generated by the measuring electrodes 131 arranged in the submerged area 310 of the object 300 to be measured. Therefore, the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 310 of the object 300 to be measured should be the same under normal conditions, the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 320 of the object 300 to be measured should be the same under normal conditions, and the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 310 of the object 300 to be measured should be different from the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 320 of the object 300 to be measured under normal conditions. The main control module 110 can determine a target measuring electrode according to the change of the comparison result, where the target measuring electrode may be the uppermost measuring electrode 131 arranged in the submerged area 320, or the lowermost measuring electrode 131 arranged in the submerged area 310, that is, the target measuring electrode is the measuring electrode 131 at the boundary between the submerged area 310 and the submerged area 320.

The main control module 110 may determine the position information of the target measuring electrodes according to the number of comparison results before determining the target measuring electrodes, where the position information may be the arrangement sequence of the target measuring electrodes, or may be the number of measuring electrodes 131 arranged in the submerged area 320 or the number of measuring electrodes 131 arranged in the submerged area 310. The main control module 110 multiplies the position information by a preset distance, and can calculate to obtain liquid level height information.

For example, the liquid level processing module 120 may obtain the measured resistance information corresponding to each measuring electrode 131 from bottom to top sequentially from the measuring electrodes 131 arranged at the bottom of the submerged region 320 according to the preset sequence. If the first five comparison results obtained by the liquid level processing module 120 are the same (e.g., the measured resistance information is smaller than the reference resistance information), the sixth comparison result obtained by the liquid level processing module 120 (e.g., the measured resistance information is larger 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 first five comparison results. The main control module 110 determines that the measurement motor corresponding to the fifth comparison result is the target measurement motor, and obtains the position information of the target measurement electrode with the sequence of 5. The main control module 110 multiplies the sequence 5 by a preset interval to obtain liquid level height information.

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

Specifically, since the object 300 to be measured includes the submerged area 310 and the submerged area 320, the plurality of measuring electrodes 131 are sequentially arranged in the submerged area 320 and the submerged area 310 from bottom to top at a predetermined interval. Here, the submerged area 310 may be understood as an area above the liquid surface of the object 300 to be measured, and the submerged area 320 may be understood as an area below the liquid surface of the object 300 to be measured. The main control module 110 is further configured to determine the measuring electrodes 131 arranged in the submerged area 320 and the measuring electrodes 131 arranged in the submerged area 310 according to the comparison result of each piece of measured resistance information; the main control module 110 is further configured to determine whether the measurement electrodes 131 arranged in the supraliquid zone 310 have abnormal measurement electrodes according to whether the comparison results corresponding to the measurement electrodes 131 arranged in the supraliquid zone 310 are consistent; the main control module 110 is further configured to determine whether the measurement electrodes 131 arranged in the submerged area 320 have abnormal measurement electrodes according to whether the comparison results corresponding to the measurement electrodes 131 arranged in the submerged area 320 are consistent.

It is understood that, since the submerged area 310 is the area above the liquid level of the object 300 to be measured, the value corresponding to the measured resistance information generated by the measuring electrodes 131 arranged in the submerged area 310 is equivalent to infinity, that is, the positive electrode and the negative electrode of the measuring electrodes 131 arranged in the submerged area 310 are equivalent to an open circuit. The submerged region 320 is a region below the liquid level of the target 300, and since the liquid has conductivity, the value corresponding to the measured resistance information generated by the measuring electrodes 131 arranged in the submerged region 320 is generally within a fixed value. Since the value corresponding to the measurement resistance information generated by the measurement electrodes 131 arranged in the submerged region 320 is also related to the distance between the positive electrode and the negative electrode of the measurement electrodes 131, and the conductivity of the liquid is related to the components of the liquid, the fixed value is generally 500K Ω if the liquid is pure water, and the fixed value is smaller if the liquid is farmland irrigation water, well water or rainwater, and the conductivity is higher. The reference resistance information can be set according to a fixed value.

Therefore, if the comparison result of comparing the measured resistance information corresponding to the measuring electrode 131 with the reference resistance information is that the measured resistance information is greater than the reference resistance information, it indicates that the measuring electrode 131 is the measuring electrode 131 arranged in the supraliquid region 310. If the comparison result of comparing the measured resistance information corresponding to the measuring electrode 131 with the reference resistance information is that the measured resistance information is smaller than the reference resistance information, it indicates that the measuring electrode 131 is the measuring electrode 131 arranged in the supraliquid region 310.

Since the measuring electrodes 131 in the submerged area 310 are connected by a conductive object (e.g., a wire), the measured resistance information corresponding to the measuring electrodes 131 arranged in the submerged area 310 may be smaller than the reference resistance information. However, the number of the measuring electrodes 131 connected by the conductive object is only a few, so that there is still more comparison result of the measured resistance information corresponding to the measuring electrodes 131 of the on-liquid region 310, which is larger than the reference resistance information. If the measuring electrodes 131 connected with the conductive object are arranged in the middle of the measuring electrodes 131 in the on-liquid region 310, the main control module 110 determines that there is an abnormal measuring electrode in the on-liquid region 310 according to the condition that the comparison result that the plurality of pieces of measured resistance information are greater than the reference resistance information is received first, then the comparison result that one piece of measured resistance information is less than the reference resistance information is received, and finally the comparison result that the plurality of pieces of measured resistance information are greater than the reference resistance information is received. If the measuring electrodes 131 connected with the conductive object are arranged on the uppermost position of the measuring electrodes 131 in the on-liquid region 310, the main control module 110 determines that there is an abnormal measuring electrode in the on-liquid region 310 according to the comparison result that a plurality of pieces of measuring resistance information are received first and then a piece of measuring resistance information is received and compared with a piece of reference resistance information.

Since the measuring electrode 131 in the submerged region 320 is surrounded by an insulating material (e.g., glue), the measured resistance information corresponding to the measuring electrode 131 arranged in the submerged region 320 may be larger than the reference resistance information. However, the number of the measuring electrodes 131 connected by the conductive object is only a few, so that there is still more comparison result that the measured resistance information corresponding to the measuring electrodes 131 of the submerged region 320 is smaller than the reference resistance information. If the measuring electrodes 131 surrounded by the insulating object are arranged in the middle of the measuring electrodes 131 in the submerged region 320, the main control module 110 determines that there is an abnormal measuring electrode in the submerged region 320 according to the condition that the comparison result that the plurality of pieces of measured resistance information are smaller than the reference resistance information is received first, then the comparison result that one piece of measured resistance information is larger than the reference resistance information is received, and finally the comparison result that the plurality of pieces of measured resistance information are smaller than the reference resistance information is received. If the measuring electrodes 131 surrounded by the insulating object are arranged at the lowest position of the measuring electrodes 131 in the submerged region 320, the main control module 110 determines that there is an abnormal measuring electrode in the submerged region 320 according to the comparison result that the measured resistance information is larger than the reference resistance information and the comparison results that the measured resistance information is smaller than the reference resistance information are received.

Meanwhile, the main control module 110 reports the abnormal information of the abnormal measuring electrode to the terminal device 200, so that the user can process the abnormal measuring electrode in time.

To further illustrate how to measure the liquid level height information of the object 300 to be measured by the measuring electrode array 130, as shown in fig. 4, a schematic circuit diagram of an implementable liquid level measuring device 100 according to an embodiment of the present application is provided. The liquid level processing module 120 includes a reference resistance setting unit 121, a measurement resistance obtaining unit 122, and a comparing unit 123, the reference resistance setting unit 121 is electrically connected to the comparing unit 123, the measurement resistance obtaining unit 122 is electrically connected to the main control module 110, the comparing unit 123, and the measurement electrode array 130, and the comparing unit 123 is electrically connected to the main control module 110.

In the present embodiment, the reference resistance setting unit 121 is configured to provide reference resistance information to the comparison unit 123; the measured resistance obtaining unit 122 is configured to obtain measured resistance information according to the measurement instruction; the comparing unit 123 is configured to compare the measured resistance information with the reference resistance information to obtain a comparison result, and send the comparison result to the main control module 110.

Further, the reference resistance setting unit 121 may also be electrically connected with the main control module 110; the main control module 110 is further configured to send a setting instruction to the reference resistance setting unit 121; the reference resistance setting unit 121 is also configured to adjust the reference resistance information according to the setting instruction.

Further, the reference resistor setting unit 121 includes a first analog switch U1 and a plurality of reference resistors Rc, a 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 electrically connected to the plurality of reference resistors Rc in a one-to-one correspondence, an output pin of the first analog switch U1 is electrically connected to the comparing unit 123, and the plurality of reference resistors Rc have different resistance values. The first analog switch U1 is configured to select one of 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 command, so as to adjust the reference resistance information, and transmit the adjusted reference resistance information to the comparing unit 123.

It can be understood that the reference resistance information is adjustable before or during actual use, one of 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 through a setting command sent by the main control module 110, and the adjusted reference resistance information is provided to the comparator U3 according to the reference resistance Rc connected to the selection pin communicating with the output pin of the first analog switch U1. The setting instruction may be a character string, for example, if the first selection pin of the first analog switch U1 needs to be selected to communicate with the output pin of the first analog switch U1, the setting instruction may be set to 1000; if it is required 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 command may be set to 0100.

In this embodiment, if the operator does not know what the fixed value is, the size of the reference resistance information cannot be set by the fixed value. Before the test, the worker may operate the main control module 110 to control the selection pin electrically connected to the reference resistor Rc with the smallest resistance value to communicate with the output pin of the first analog switch U1 to obtain the information of the smallest reference resistor. If the values of the plurality of reference resistances Rc are set to 16K, 91K, 169K, 243K, 324K, 392K, 470K, 549K, 620K, 698K, 768K, 845K, and 931K, etc., respectively, the minimum reference resistance information corresponds to 16K. The worker then operates the main control module 110 to control the measured resistance obtaining unit 122 to obtain the measured resistance information generated by the measuring electrode 131 at the bottom of the submerged area 320. The comparing unit 123 compares the minimum reference resistance information with the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320, and if the minimum reference resistance information is smaller than the comparison result of the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320, it indicates that the value of the reference resistance information is too small to select, and the liquid level measurement cannot be performed, so that the worker can operate the main control module 110 to control the selection pin electrically connected with the reference resistance Rc with a larger resistance value to be communicated with the output pin of the first analog switch U1, so as to obtain larger reference resistance information. The comparing unit 123 compares the larger reference resistance information with the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320, and if the larger reference resistance information is larger than the comparison result of the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320, it indicates that the larger reference resistance information is suitable for value selection; if the larger reference resistance information is obtained and is still smaller than the comparison result of the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320, the larger reference resistance information is selected and compared with the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320 until the reference resistance information is obtained and is larger than the comparison result of the measured resistance information generated by the measuring electrode 131 at the lowest position of the liquid region 320.

Of course, in another embodiment, the value of the reference resistance information may be set by averaging the value of the measured resistance information generated by the measuring electrode 131 in the submerged region 320 and the value of the measured resistance information generated by the measuring electrode 131 in the submerged region 310, and taking the average value of the measured resistance information generated by the measuring electrode 131 in the submerged region 320 and the value of the measured resistance information generated by the measuring electrode 131 in the submerged region 310 as the value of the reference resistance information. Of course, the value of the reference resistance information may be selected in other manners, and is not limited herein.

In this embodiment, since the submerged area 310 includes a dry area and a wet area, the wet area can be understood as a wet area on the measuring electrode array 130 after the liquid level of the object 300 to be measured drops. Although the electrical conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the wet water region is greater than the electrical conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the dry region, the electrical conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the wet water region is much smaller than the electrical conductivity between the detection positive electrode TP and the detection negative electrode GND of the measurement electrode 131 arranged in the submerged region 320. The information of the measured resistance of the measuring electrodes 131 arranged in the wet water region is much greater than that of the measuring electrodes 131 arranged in the submerged region 320, and the information of the measured resistance of the measuring electrodes 131 arranged in the dry region is much greater than that of the measuring electrodes 131 arranged in the wet water region. Therefore, the reference resistance information set in the present application is also smaller than the measured resistance information of the measuring electrodes 131 arranged in the wet water region.

Further, as shown in fig. 4, the measured resistance obtaining unit 122 includes a second analog switch U2, a control pin of the second analog switch U2 is electrically connected to the main control module 110, a plurality of selection pins of the second analog switch U2 are electrically connected to the measuring electrode array 130, respectively, and an output pin of the second analog switch U2 is electrically connected to the comparing unit 123. The second analog switch U2 is configured to select one of the selection pins of the second analog switch U2 to communicate with the output pin of the second analog switch U2 according to the measurement command, so as to obtain the measured resistance information, and transmit the measured resistance information to the comparing unit 123.

It is understood that the second analog switch U2 can be provided in a plurality, and can be specifically provided according to the number of the measuring electrodes 131. Wherein, the selection pins of the second analog switch U2 can be electrically connected with the detection positive electrodes TP of the measurement electrodes 131, respectively.

In this embodiment, the second analog switch U2 may sequentially acquire the measured resistance information generated by each measuring electrode 131 according to the measurement instruction, and the sequentially acquired measured resistance information of the measuring electrodes 131 should be sequentially acquired the measured resistance information generated by the measuring electrodes 131 arranged at the object 300 to be measured from bottom to top. That is, the acquisition is started from the measured resistance information generated from the measurement electrode 131 arranged at the lowermost surface of the object 300 to be measured.

Further, as shown in fig. 4, the comparing 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, the second resistor R2 is electrically connected to the measurement resistor acquiring unit 122, a non-inverting input terminal of the comparator U3 is electrically connected between the second resistor R2 and the measurement resistor acquiring unit 122, an inverting input terminal of the comparator U3 is electrically connected between the first resistor R1 and the reference resistor setting unit 121, and an output terminal of the comparator U3 is electrically connected to the main control module 110. The comparator U3 is configured to compare the measured resistance information with the reference resistance information to obtain a comparison result, and send the comparison result to the main control module 110.

It is 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 of the comparator U3 is used for obtaining the measured resistance information, and the inverting input of the comparator U3 is used for obtaining the reference resistance information. The comparator U3 compares the measured resistance information with the reference resistance information, and if the measured resistance information is greater than the reference resistance information, the output end of the comparator U3 generates a high-level comparison result; if the measured resistance information is less than the reference resistance information, the output of the comparator U3 will generate a low comparison result.

Further, as shown in fig. 5, for another implementable structural schematic diagram of the liquid level measurement device 100 provided in the embodiment of the present application, on the basis of the liquid level measurement device 100 shown in fig. 3, the liquid level measurement device 100 shown in fig. 5 further includes a communication module 140, and the main control module 110 is electrically connected with the terminal device 200 through the communication module 140. The main control module 110 is further used for transmitting the liquid level height information to the terminal device 200 through the communication module 140.

In this embodiment, the communication module 140 may be an RS232 communication module, an RS485 communication module, a power carrier communication module, a wireless communication module, and the like.

In this embodiment, the communication module 140 is preferably configured as a power carrier communication module, as shown in fig. 6, which is a schematic circuit diagram of the communication module 140 being a power carrier communication module. The communication module 140 includes a rectifying unit 141 and a power carrier communication unit 142, the rectifying unit 141 is electrically connected to the terminal device 200, the rectifying unit 141 is also electrically connected to both the power carrier communication unit 142 and the power supply module 150, and the power carrier communication unit 142 is also electrically connected to the main control module 110.

In this embodiment, the rectifying unit 141 is configured to rectify the power supply voltage provided by the terminal device 200 to obtain a rectified power supply voltage, and transmit the rectified power supply voltage to the power supply module 150 and the power carrier communication unit 142 respectively; the power line carrier 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.

It can be understood that the power carrier communication unit 142 includes a third resistor R3, a fourth resistor R4, a first switch Q1 and a power carrier receiving chip U4, the third resistor R3 and the fourth resistor R4 are connected in series between the rectifying unit 141 and the ground, a receiving pin of the power carrier receiving chip U4 is electrically connected between the third resistor R3 and the fourth resistor R4, a serial pin of the power carrier receiving chip U4 is electrically connected to the main control module 110, a transmitting pin of the power carrier receiving chip U4 is electrically connected to a first pin of the first switch, a second pin of the first switch Q1 is electrically connected between the rectifying unit 141 and the power supply module 150, and a third pin of the first switch Q1 is electrically connected to the ground.

After voltage division is performed by the third resistor R3 and the fourth resistor R4, the test command transmitted by the terminal device 200 can be obtained. The main control module 110 controls the on/off of the first switch tube through the power line carrier receiving chip U4, and can report the liquid level height information, the abnormal information and the like to the terminal device 200.

In this embodiment, the rectifying unit 141 includes a ceramic discharge tube GDT1, a recoverable fuse F1, a TVS tube D1, and a rectifying bridge D2, and the ceramic discharge tube GDT1, the recoverable fuse F1, and the TVS tube D1 form a lightning protection circuit. The rectifier bridge D2 is used to realize polarity-independent power supply of the terminal device 200, which is convenient for layout and avoids short-circuit fault caused by reverse connection.

As shown in fig. 5, the liquid level measuring apparatus 100 further includes a power supply module 150, and 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 a 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 perform voltage conversion on the power voltage to obtain an operating voltage, and provide the operating voltage to the main control module 110 and the liquid level processing module 120.

In this embodiment, the power supply module 150 includes at least one dc voltage conversion chip, and the power supply voltage can be reduced to a plurality of operating voltages with different magnitudes by the at least one dc voltage conversion chip.

To sum up, the embodiment of the present invention provides a liquid level measuring device and a 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 for being disposed at a target to be measured; the main control module is used for sending a measurement instruction to the liquid level processing module; the liquid level processing module is used for acquiring measurement resistance information generated by the measurement electrode array according to the measurement instruction; the liquid level processing module is also used for comparing the measured resistance information with preset reference resistance information to obtain a comparison result and sending the comparison result to the main control module; the main control module is also used for determining the liquid level height information of the target to be detected according to the comparison result. Therefore, the liquid level height information of the target to be measured can be accurately measured and obtained through measuring resistance information generated by the electrode array. Because the measuring resistance information generated by the measuring electrode array is not influenced by soil, impurities, crops and the like, the liquid level height of the target to be measured can be accurately and reliably measured through the measuring resistance generated by the measuring electrode array.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The liquid level measuring device is characterized by comprising a main control module, a liquid level processing module and a measuring electrode array, wherein the main control module, the liquid level processing module and the measuring electrode array are sequentially and electrically connected, and the measuring electrode array is used for being arranged at a target to be measured;

the main control module is used for sending a measurement instruction to the liquid level processing module;

the liquid level processing module is used for acquiring measurement resistance information generated by the measurement electrode array according to the measurement instruction;

the liquid level processing module is also used for comparing the measured resistance information with preset reference resistance information to obtain a comparison result and sending the comparison result to the main control module;

and the main control module is also used for determining the liquid level height information of the target to be detected according to the comparison result.

2. The liquid level measuring device of claim 1, wherein the measuring electrode array comprises a plurality of measuring electrodes, the plurality of measuring electrodes are electrically connected to the liquid level processing module respectively, the plurality of measuring electrodes are sequentially arranged at the target to be measured from bottom to top according to a preset interval, and each measuring electrode correspondingly generates one piece of measuring resistance information;

the liquid level processing module is used for sequentially acquiring the measurement resistance information generated by each measurement electrode according to the measurement instruction and a preset sequence;

the liquid level processing module is further used for sequentially comparing each piece of measured resistance information with the reference resistance information to obtain a comparison result of each piece of measured resistance information, and sending the comparison result of each piece of measured resistance information to the main control module;

the main control module is also used for determining a target measuring electrode according to the comparison result of each piece of measuring resistance information and acquiring the position information of the target measuring electrode;

the main control module is further used for calculating to obtain the liquid level height information according to the position information and the preset distance.

3. The liquid level measuring device of claim 2, wherein the object to be measured includes an upper liquid region and a lower liquid region, and the plurality of measuring electrodes are arranged in the lower liquid region and the upper liquid region in sequence from bottom to top at a predetermined interval;

the main control module is further used for determining the measuring electrodes distributed in the upper liquid area and the measuring electrodes distributed in the lower liquid area according to the comparison result of each piece of measured resistance information;

the main control module is also used for judging whether the measuring electrodes distributed in the submerged upper area have abnormal measuring electrodes according to whether the comparison results corresponding to the measuring electrodes distributed in the submerged upper area are consistent;

the main control module is further used for judging whether the measuring electrodes arranged in the liquid area have abnormal measuring electrodes or not according to whether the comparison results corresponding to the measuring electrodes arranged in the liquid area are consistent or not.

4. The liquid level measuring device of claim 1, wherein the liquid level processing module comprises a reference resistance setting unit, a measurement resistance obtaining unit and a comparison unit, the reference resistance setting unit is electrically connected with the comparison unit, the measurement resistance obtaining unit is electrically connected with the main control module, the comparison unit and the measurement electrode array, and the comparison unit is electrically connected with the main control module;

the reference resistance setting unit is used for providing the reference resistance information to the comparison unit;

the measuring resistance obtaining unit is used for obtaining the measuring resistance information according to the measuring instruction;

the comparison unit is used for comparing the measured resistance information with the reference resistance information to obtain a comparison result, and sending the comparison result to the main control module.

5. The fluid level measuring device of claim 4, wherein the reference resistance setting unit is further electrically connected to the master control module;

the main control module is also used for sending a setting instruction to the reference resistance setting unit;

the reference resistance setting unit is further used for adjusting the reference resistance information according to the setting instruction.

6. The liquid level measuring device of claim 5, wherein the reference resistor setting unit comprises a first analog switch and a plurality of reference resistors, a control pin of the first analog switch is electrically connected with the main control module, a plurality of selection pins of the first analog switch are electrically connected with the plurality of reference resistors in a one-to-one correspondence manner, an output pin of the first analog switch is electrically connected with the comparison unit, and the resistance values of the plurality of reference resistors are different;

the first analog switch is used for selecting one of a plurality of selection pins of the first analog switch to be communicated with an output pin of the first analog switch according to the setting instruction, so that the reference resistance information is adjusted, and the adjusted reference resistance information is transmitted to the comparison unit.

7. The liquid level measuring device of claim 5, wherein the measuring resistance obtaining unit comprises a second analog switch, a control pin of the second analog switch is electrically connected with the main control module, a plurality of selection pins of the second analog switch are respectively electrically connected with the measuring electrode array, and an output pin of the second analog switch is electrically connected with the comparing unit;

the second analog switch is used for selecting one of a plurality of selection pins of the second analog switch to be communicated with an output pin of the second analog switch according to the measurement instruction, so that the measurement resistance information is obtained, and the measurement resistance information is transmitted to the comparison unit.

8. The liquid level measuring device of claim 5, wherein the comparing unit comprises a comparator, a first resistor and a second resistor, the first resistor is electrically connected with the reference resistor setting unit, the second resistor is electrically connected with the measuring resistor acquiring unit, a non-inverting input end of the comparator is electrically connected between the second resistor and the measuring resistor acquiring unit, an inverting input end of the comparator is electrically connected between the first resistor and the reference resistor setting unit, and an output end of the comparator is electrically connected with the main control module;

the comparator is used for comparing the measured resistance information with the reference resistance information to obtain a comparison result, and sending the comparison result to the main control module.

9. The fluid level measuring device of claim 1, further comprising a communication module, wherein the master control module is electrically connected to a terminal device through the communication module;

the main control module is also used for transmitting the liquid level height information to the terminal equipment through the communication module.

10. A liquid level measuring system, comprising a terminal device and a liquid level measuring apparatus according to any one of claims 1 to 9, the terminal device being electrically connected to the liquid level measuring apparatus;

and the terminal equipment is used for receiving the liquid level height information of the liquid level measuring device.

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