Ultrasonic saline concentration measuring device

Abstract

This invention provides an ultrasonic saline concentration measuring device. The ultrasonic saline concentration measuring device includes: a test tube; the test tube has an inlet and an outlet, the inlet and outlet communicating with the internal space of the test tube; a detection structure, including a transmitting probe and a receiving probe disposed at both ends of the test tube, at least a portion of the transmitting probe and the receiving probe extending into the internal space of the test tube so that the transmitting probe corresponds to the receiving probe; a clean water pipeline connected to the inlet, the side wall of the test tube having a cleaning channel inclined towards the detection structure, the clean water pipeline communicating with the internal space of the test tube through the cleaning channel; a saline pipeline connected to the inlet; and a controller electrically connected to the detection structure, the clean water pipeline, and the saline pipeline. This invention solves the problems of short probe lifespan and inaccurate measurement results in existing saline concentration detection technologies.

Description

Technical Field

[0001] This invention relates to the field of automatic solution monitoring equipment technology, and more specifically, to an ultrasonic saline concentration measuring device. Background Technology

[0002] In industrial automated production, it is often necessary to detect the concentration of high-conductivity solutions such as brine to determine the feedback endpoint and achieve automatic control. Current technology often uses conductivity probes to monitor the concentration of solutions like brine. However, industrial brine contains many impurities, has a high concentration, and is highly corrosive. Over time, this can easily lead to probe aging and surface crystallization, significantly reducing the accuracy of the detection endpoint and shortening the probe's lifespan, necessitating regular probe maintenance. Observations from various probe usage scenarios in industrial settings show that probe detection generally suffers from short service life.

[0003] In other words, existing saline concentration detection technologies suffer from short probe lifespan and inaccurate measurement results. Summary of the Invention

[0004] The main objective of this invention is to provide an ultrasonic saline concentration measuring device to solve the problems of short probe life and inaccurate measurement results in the existing saline concentration detection technology.

[0005] To achieve the above objectives, the present invention provides an ultrasonic saline concentration measuring device, comprising: a test tube having an inlet and an outlet, the inlet and outlet communicating with the internal space of the test tube; a detection structure including a transmitting probe and a receiving probe disposed at both ends of the test tube, at least a portion of the transmitting probe and the receiving probe extending into the internal space of the test tube so that the transmitting probe corresponds to the receiving probe; a clean water pipeline connected to the inlet, the side wall of the test tube having a cleaning channel inclined toward the detection structure, the clean water pipeline communicating with the internal space of the test tube through the cleaning channel; a saline pipeline connected to the inlet; and a controller electrically connected to the detection structure, the clean water pipeline, and the saline pipeline.

[0006] Furthermore, the inlet includes a clean water inlet and a saline inlet spaced apart on the side wall of the test tube, with a clean water pipeline connected to the clean water inlet and a saline pipeline connected to the saline inlet.

[0007] Furthermore, the sidewall of the test tube has a pressure-retaining cavity that extends circumferentially along the test tube, and the clean water inlet is connected to the cleaning channel through the pressure-retaining cavity.

[0008] Furthermore, there are multiple pressure-holding cavities, with at least one pressure-holding cavity at each end of the test tube. The sidewall of the test tube has a clamping cavity as a connecting channel, which extends along the length of the test tube, and the two ends of the connecting channel are respectively connected to the pressure-holding cavities at both ends of the test tube.

[0009] Furthermore, there are multiple cleaning channels, which are spaced apart along the circumference of the test tube.

[0010] Furthermore, the angle between the extension direction of the cleaning channel and the axis of the test tube is 45 degrees.

[0011] Furthermore, a clean water solenoid valve and a clean water booster pump are sequentially installed on the clean water pipeline, with the clean water solenoid valve being closer to the clean water inlet than the clean water booster pump; a brine solenoid valve, a backwash filter, and a brine booster pump are sequentially installed on the brine pipeline, with the brine solenoid valve being closer to the brine inlet than the brine booster pump.

[0012] Furthermore, the ultrasonic saline concentration measuring device also includes a backwashing line connected to a backwashing filter, and a backwashing solenoid valve is installed on the backwashing line.

[0013] Furthermore, the backwash filter is cylindrical, and the cylindrical backwash filter includes: a cover; a main body, one end of which has an opening, the cover being placed on the main body to block the opening and forming a filtration space between the cover and the main body, the side wall of the main body having a set of corresponding through holes, through which the brine pipeline communicates with the filtration space; and a filter device, which is columnar, disposed within the filtration space and spaced apart from the inner wall of the main body to form an impurity chamber between them.

[0014] Furthermore, the other end of the main body has a drain hole that communicates with the filtration space, and the backwash line is connected to the drain hole.

[0015] Furthermore, the ultrasonic saline concentration measuring device also includes an outlet pipeline connected to an outlet, and a venting solenoid valve is installed on the outlet pipeline.

[0016] According to the technical solution of this invention, the ultrasonic saline concentration measuring device includes a test tube, a detection structure, a clean water pipeline, a saline pipeline, and a controller. The test tube has an inlet and an outlet, which are connected to the internal space of the test tube. The detection structure includes a transmitting probe and a receiving probe disposed at both ends of the test tube, with at least a portion of each probe extending into the internal space of the test tube so that the transmitting probe corresponds to the receiving probe. The clean water pipeline is connected to the inlet, and the side wall of the test tube has a cleaning channel inclined towards the detection structure, through which the clean water pipeline is connected to the internal space of the test tube. The saline pipeline is connected to the inlet. The controller is electrically connected to the detection structure, the clean water pipeline, and the saline pipeline.

[0017] The inlet and outlet are connected to the internal space of the test tube. This design allows liquid to enter the internal space of the test tube through the inlet, be transported internally, and exit through the outlet, effectively planning the flow path of the liquid inside the test tube and improving the reliability of the test tube. At least a portion of the transmitting and receiving probes extends into the internal space of the test tube, so that the transmitting and receiving probes correspond. This design allows both the transmitting and receiving probes to contact the saline solution inside the internal space. The transmitting and receiving probes are positioned opposite each other, allowing the signal emitted by the transmitting probe to pass through the saline solution and be received by the receiving probe. A computer algorithm then calculates the concentration of the saline solution inside the test tube, completing the saline solution concentration detection. This helps ensure the stability of the saline solution concentration detection. The side wall of the test tube has a cleaning channel inclined towards the detection structure. A clean water line connects to the internal space of the test tube through the cleaning channel. This design connects one end of the cleaning channel to the clean water line, and the other end of the cleaning channel faces the detection surface of the detection structure. This allows clean water from the clean water pipeline to be sprayed onto the detection surface of the detection structure through the cleaning channel, thus flushing and cleaning the detection structure. This avoids the residue of salt water on the detection structure, thereby preventing the risk of crystallization. It helps to ensure the cleanliness of the detection structure, the reliability and stability of its use, and ultimately improves the detection accuracy and the accuracy of the test results.

[0018] Furthermore, the cleaning channel significantly reduces the corrosion of the detection structure by the brine, slows down its aging process, avoids frequent maintenance, saves maintenance procedures and time, and effectively extends the service life of the detection structure, thus saving costs. The controller is electrically connected to the detection structure, the clean water pipeline, and the brine pipeline. This configuration enables the controller to automate the control of the ultrasonic brine concentration measurement device, achieving an automated brine concentration detection process that meets practical application requirements. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of an ultrasonic saline concentration measuring device according to an optional embodiment of the present invention is shown;

[0021] Figure 2 It shows Figure 1 Schematic diagram of the structure of the test tube;

[0022] Figure 3 It shows Figure 1A schematic diagram of the backwash filter.

[0023] The above figures include the following reference numerals:

[0024] 10. Test tube; 11. Outlet; 12. Cleaning channel; 13. Clean water inlet; 14. Brine inlet; 15. Pressure chamber; 16. Connecting channel; 17. Temperature and pressure measuring hole; 20. Detection structure; 30. Clean water pipeline; 31. Clean water solenoid valve; 32. Clean water booster pump; 40. Brine pipeline; 41. Brine solenoid valve; 42. Backwash filter; 421. Cover; 422. Main body; 4221. Drain hole; 4222. Through hole; 423. Filter screen; 43. Brine booster pump; 50. Outlet pipeline; 51. Venting solenoid valve; 60. Backwash pipeline; 61. Backwash solenoid valve. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0028] To address the problems of short probe lifespan and inaccurate measurement results in existing saline concentration detection technologies, this invention provides an ultrasonic saline concentration measuring device.

[0029] like Figures 1 to 3As shown, the ultrasonic saline concentration measuring device includes a test tube 10, a detection structure 20, a clean water line 30, a saline line 40, and a controller. The test tube 10 has an inlet and an outlet 11, which communicate with the internal space of the test tube 10. The detection structure 20 includes a transmitting probe and a receiving probe disposed at both ends of the test tube 10, with at least a portion of each probe extending into the internal space of the test tube 10 to correspond to the receiving probe. The clean water line 30 is connected to the inlet, and the side wall of the test tube 10 has a cleaning channel 12 inclined towards the detection structure 20, through which the clean water line 30 communicates with the internal space of the test tube 10. The saline line 40 is connected to the inlet. The controller is electrically connected to the detection structure 20, the clean water line 30, and the saline line 40.

[0030] The inlet and outlet 11 are connected to the internal space of the test tube 10. This arrangement allows liquid to enter the internal space of the test tube 10 through the inlet, be transported internally, and exit through the outlet 11, effectively planning the flow path of the liquid inside the test tube 10 and improving the reliability of the test tube 10. At least a portion of the transmitting probe and the receiving probe extend into the internal space of the test tube 10, so that the transmitting probe and the receiving probe correspond. This arrangement allows both the transmitting probe and the receiving probe to contact the saline solution inside the internal space. The transmitting probe and the receiving probe are positioned opposite each other, allowing the signal emitted by the transmitting probe to pass through the saline solution and be received by the receiving probe. The concentration of the saline solution inside the test tube 10 is then determined by a computer algorithm, completing the saline solution concentration detection. This helps ensure the stability of the saline solution concentration detection. The side wall of the test tube 10 has a cleaning channel 12 inclined towards the detection structure 20. The clean water line 30 is connected to the internal space of the test tube 10 through the cleaning channel 12. This arrangement allows one end of the cleaning channel 12 to be connected to the clean water line 30, and the other end of the cleaning channel 12 to face the detection surface of the detection structure 20. This allows clean water from the clean water pipeline 30 to be sprayed onto the detection surface of the detection structure 20 through the cleaning channel 12, thereby flushing and cleaning the detection structure 20. This prevents salt water residue on the detection structure 20, thus avoiding the risk of crystallization. It helps ensure the cleanliness of the detection structure 20, as well as its reliability and operational stability, thereby improving detection accuracy and ensuring the accuracy of test results.

[0031] Furthermore, the installation of the cleaning channel 12 significantly reduces the corrosion of the detection structure 20 by the brine, slows down its aging process, avoids frequent maintenance, saves maintenance procedures and time, and effectively extends its service life, thus saving costs. The controller is electrically connected to the detection structure 20, the clean water line 30, and the brine line 40. This configuration enables the controller to automate the control of the ultrasonic brine concentration measurement device, achieving an automated brine concentration detection process that meets practical application requirements.

[0032] It should be noted that both the transmitting and receiving probes mentioned above are ultrasonic probes. Based on the principle that the feedback time varies when ultrasonic waves penetrate liquids of different concentrations, automatic process control is performed on the peripheral process pipeline, simulating human sampling, testing, and maintenance methods to achieve automatic measurement of liquid concentration. The controller includes ultrasonic circuit processing software and has built-in filtering.

[0033] Specifically, the inlets include a clean water inlet 13 and a saline inlet 14, spaced apart on the side wall of the test tube 10. A clean water line 30 is connected to the clean water inlet 13, and a saline line 40 is connected to the saline inlet 14. This arrangement ensures that the clean water inlet 13 and the saline inlet 14 are separate, allowing them to operate independently and avoiding interference. It also ensures that the clean water line 30 and the saline line 40 are independent, preventing the liquids from mixing and affecting the saline concentration detection. This helps ensure the stability and accuracy of the saline concentration detection results.

[0034] like Figure 2 As shown, the sidewall of the test tube 10 has a pressure-retaining cavity 15, which extends circumferentially along the test tube 10. A clean water inlet 13 communicates with the cleaning channel 12 through the pressure-retaining cavity 15. There are multiple pressure-retaining cavities 15, with at least one at each end of the test tube 10. The sidewall of the test tube 10 has a cavity serving as a connecting channel 16, which extends along the length of the test tube 10. Both ends of the connecting channel 16 are connected to the pressure-retaining cavities 15 at both ends of the test tube 10. This arrangement allows clean water to enter the pressure-retaining cavity 15 at one end of the test tube 10 through the clean water inlet 13 during cleaning, and then be transported to the pressure-retaining cavity 15 at the other end of the test tube 10 through the connecting channel 16. The cleaning channel 12 is located on the sidewall between the pressure-retaining cavity 15 and the internal space, allowing the clean water in the pressure-retaining cavity 15 to be sprayed onto the detection structure 20 under pressure, thereby washing away the crystalline salt on the detection structure 20 and cleaning the detection structure 20. The outlet 11 is located on the outer wall of the test tube 10 corresponding to the pressure chamber 15, so that the liquid for cleaning the detection structure 20 can be discharged from the outlet 11.

[0035] Specifically, the ultrasonic saline concentration measuring device also includes an outlet pipeline 50, which is connected to an outlet 11. A venting solenoid valve 51 is installed on the outlet pipeline 50. The venting solenoid valve 51 is opened intermittently to ensure the water pressure in the pressure chamber 15, thereby ensuring that the cleaning channel 12 can form a high-pressure water jet to clean the detection structure 20, thus ensuring the cleaning effect.

[0036] It should be noted that the aforementioned import and export 11 are located on opposite sides of the test tube 10.

[0037] It should be noted that the test tube 10 also has a temperature and pressure measurement hole 17, which is located on the side of the test tube 10 near the outlet 11.

[0038] Specifically, there are multiple cleaning channels 12, spaced circumferentially along the sidewall between the pressure chamber 15 and the internal space of the test tube 10. This arrangement increases the number of cleaning channels 12, ensuring that the portion of the probe structure 20 extending into the internal space is cleaned and flushed by the cleaning channels 12. This results in a more comprehensive and thorough cleaning of the probe structure 20, further reducing the possibility of residual crystalline salts on the probe structure 20, increasing its service life, and improving its measurement accuracy.

[0039] It should be noted that both ends of the test tube 10 have four cleaning channels 12. Of course, the number of cleaning channels 12 can be set according to specific circumstances.

[0040] Specifically, the angle between the extension direction of the cleaning channel 12 and the axis of the test tube 10 is 45 degrees. This arrangement helps to ensure that one end of the cleaning channel 12 is aligned with the detection structure 20, so that the water jet sprayed from the cleaning channel 12 can directly hit the detection structure 20, thereby ensuring the cleaning effect of the detection structure 20 and thus ensuring the cleanliness of the detection structure 20.

[0041] like Figure 1 As shown, a clean water solenoid valve 31 and a clean water booster pump 32 are sequentially installed on the clean water pipeline 30, with the clean water solenoid valve 31 located closer to the clean water inlet 13 relative to the clean water booster pump 32. A brine solenoid valve 41, a backwash filter 42, and a brine booster pump 43 are sequentially installed on the brine pipeline 40, with the brine solenoid valve 41 located closer to the brine inlet 14 relative to the brine booster pump 43. The ultrasonic brine concentration measuring device also includes a backwash pipeline 60, which connects to the backwash filter 42, and a backwash solenoid valve 61 is installed on the backwash pipeline 60.

[0042] It should be noted that the controller of this invention is an ultrasonic measurement controller, which integrates an ultrasonic drive circuit and all process control functions of the ultrasonic saline concentration measuring device of this invention. The program includes ultrasonic filtering algorithms, temperature correction algorithms, measurement process control, cleaning process control, and automatic filter backwashing control to achieve automatic measurement, mobile cleaning, and automatic backwashing functions of the ultrasonic saline concentration measuring device.

[0043] The control method for ultrasonic saline concentration measuring devices includes a cleaning process, a measurement process, and a backwashing process.

[0044] The cleaning process includes: starting the clean water booster pump 32, opening the clean water solenoid valve 31, allowing clean water from the clean water pipeline 30 to enter the pressure chamber 15 through the clean water inlet 13, and then being sprayed onto the detection structure 20 through the cleaning channel 12 to flush away the crystallized salt on the detection structure 20, while simultaneously cleaning the internal space of the test tube 10. Then, the venting solenoid valve 51 is opened to drain the liquid from the test tube 10. The duration is greater than 1 minute. After cleaning, the sound velocity of the clean water is measured using the detection structure 20 as a calibration reference and sent to the controller for subsequent correction. The cleaning process achieves clean water liquid measurement, test tube cleaning, and detection structure cleaning.

[0045] The measurement process includes: starting the brine booster pump 43, allowing the brine to pass through the backwash filter 42 to remove impurities; opening the brine solenoid valve 41, allowing the brine in the brine pipeline 40 to enter the internal space of the test tube 10 through the brine inlet 14; after the internal space of the test tube 10 is filled with brine, opening the venting solenoid valve 51 to discharge the brine. To ensure accurate measurement results, the brine needs to be discharged for more than one minute. Then, the detection structure 20 is controlled to perform measurement sampling, and the measurement data is sent to the controller. The measurement process completes the filtration, measurement, and discharge of the brine.

[0046] After a period of use, if the backwash filter 42 contains excessive impurities, the backwashing process is initiated. The backwashing process includes: starting the clean water booster pump 32, opening the clean water solenoid valve 31, the brine solenoid valve 41, and the backwash solenoid valve 61, allowing clean water to enter the test tube 10 through the clean water inlet 13, and then through the brine inlet 14 into the brine pipeline 40. The brine pipeline 40 then delivers the clean water to the backwash filter 42. Because the backwash filter 42 uses a mesh filter screen 423 for isolation, the clean water can flush the dirt in the impurity chamber to the drain hole 4221 for discharge, ensuring the filtration effect of the backwash filter 42 and preventing impurities or dirt from clogging the filter screen 423 and affecting the smooth flow of brine. The backwashing process lasts for more than 5 minutes, after which the measurement process can be restarted.

[0047] like Figure 3As shown, the backwash filter 42 is cylindrical, comprising a cover 421, a main body 422, and a filtering device. One end of the main body 422 has an opening, and the cover 421 covers the main body 422 to block the opening, forming a filtering space between the cover 421 and the main body 422. A set of through holes 4222 are correspondingly arranged on the side wall of the main body 422, through which the brine pipeline 40 communicates with the filtering space. This arrangement allows brine delivered by the brine booster pump 43 to enter the backwash filter 42 through one through hole 4222, be filtered by the filtering device, and then enter the brine pipeline 40 near the brine solenoid valve 41 through another through hole 4222, thus realizing the delivery of brine. This allows the backwash filter 42 to filter out impurities in the brine, avoiding the influence of impurities on the test results and helping to ensure the accuracy of the test results.

[0048] Specifically, the filter device is columnar, positioned within the filtration space and spaced apart from the inner wall of the main body 422 to form an impurity chamber between them. The other end of the main body 422 has a drain hole 4221 communicating with the filtration space, and a backwash line 60 is connected to the drain hole 4221. This arrangement allows the backwashing process to be initiated when a large amount of impurities accumulate in the backwash filter 42. Clean water enters the test tube 10 through the clean water inlet 13, and then enters the brine line 40 through the brine inlet 14. The brine line 40 delivers the clean water to the backwash filter 42, flushing the impurities in the impurity chamber to the drain hole 4221 for discharge, thus ensuring the filtration effect of the backwash filter 42.

[0049] It should be noted that the above-mentioned filtration device is filter screen 423.

[0050] It should be noted that the controller of this invention uses a sound velocity and concentration fitting algorithm to realize the conversion of saline concentration.

[0051] After the controller collects the sound velocity of the saline solution through the detection structure 20, it performs concentration conversion using the following fitting formula:

[0052] Yn=0.001575592×(1000-S)-0.092663934 (Formula 1)

[0053] In the formula: Yn is the solution concentration; 0.001575592 is the calibration coefficient 1; 1000 is a constant; S is the measured sound velocity value in seconds; 0.092663934 is the calibration coefficient 2.

[0054] The above formula applies when the distance between the transmitting and receiving probes is 1.34 meters. If the distance between the transmitting and receiving probes changes, the formula needs to be refitted.

[0055] This invention enables the measurement of saline concentration using ultrasound. The process eliminates factors that interfere with ultrasonic measurement by filtering the saline and adding a cleaning step to the detection structure 20, ensuring measurement accuracy. A linearization formula is developed based on actual measurement values ​​to achieve automatic concentration measurement. The controller has a built-in Ethernet communication interface for timely uploading of concentration data. During measurement, all processes are automatically controlled, sending concentration data once per minute.

[0056] In the water treatment process of heating stations, a brine concentration of 15-18% is required. Insufficient concentration fails to meet process requirements, while excessive concentration results in waste. Traditionally, manual measurement is performed using a galvanometer before proceeding with brine circulation and other steps. With the ultrasonic brine concentration measuring device of this invention, brine concentration can be measured in real time. Once the required concentration is reached, a signal is sent to the upper control system, allowing the qualified brine to enter the process. If the concentration is insufficient, the upper control system receives the signal and initiates the circulation process, repeating the salting process until the required concentration is achieved. The entire process is fully automated.

[0057] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ultrasonic saline concentration measuring device, characterized in that, include: A test tube (10) having an inlet and an outlet (11) communicating with the internal space of the test tube (10); The detection structure (20) includes a transmitting probe and a receiving probe disposed at both ends of the test tube (10). The transmitting probe and the receiving probe are both ultrasonic probes. At least a portion of the transmitting probe and the receiving probe extend into the internal space of the test tube (10) so that the transmitting probe corresponds to the receiving probe. A clean water pipeline (30) is connected to the inlet. The side wall of the test tube (10) has a cleaning channel (12) that is inclined toward the detection structure (20). The clean water pipeline (30) communicates with the internal space of the test tube (10) through the cleaning channel (12). A brine pipeline (40) is connected to the inlet; The controller is electrically connected to the detection structure (20), the clean water pipeline (30), and the brine pipeline (40); The inlet includes a clean water inlet (13) and a saline inlet (14) spaced apart on the side wall of the test tube (10), the clean water pipeline (30) is connected to the clean water inlet (13), and the saline pipeline (40) is connected to the saline inlet (14). A brine solenoid valve (41), a backwash filter (42), and a brine booster pump (43) are sequentially installed on the brine pipeline (40), wherein the brine solenoid valve (41) is closer to the brine inlet (14) than the brine booster pump (43). The ultrasonic saline concentration measuring device also includes a backwash line (60), which is connected to the backwash filter (42), and a backwash solenoid valve (61) is provided on the backwash line (60). The inlet and the outlet (11) are located on opposite sides of the test tube (10).

2. The ultrasonic saline concentration measuring device according to claim 1, characterized in that, The side wall of the test tube (10) has a pressure chamber (15), which extends circumferentially along the test tube (10), and the clean water inlet (13) is connected to the cleaning channel (12) through the pressure chamber (15).

3. The ultrasonic saline concentration measuring device according to claim 2, characterized in that, There are multiple pressure chambers (15), and at least one pressure chamber (15) is provided at both ends of the test tube (10). The side wall of the test tube (10) has a cavity to serve as a communication channel (16). The communication channel (16) extends along the length of the test tube (10), and both ends of the communication channel (16) are respectively connected to the pressure chambers (15) at both ends of the test tube (10).

4. The ultrasonic saline concentration measuring device according to claim 1, characterized in that, There are multiple cleaning channels (12), and the multiple cleaning channels (12) are arranged at intervals along the circumference of the test tube (10).

5. The ultrasonic saline concentration measuring device according to claim 4, characterized in that, The angle between the extending direction of the cleaning channel (12) and the axis of the test tube (10) is 45 degrees.

6. The ultrasonic saline concentration measuring device according to claim 1, characterized in that, A water solenoid valve (31) and a water booster pump (32) are sequentially installed on the water pipeline (30), wherein the water solenoid valve (31) is closer to the water inlet (13) than the water booster pump (32).

7. The ultrasonic saline concentration measuring device according to claim 6, characterized in that, The backwash filter (42) is cylindrical, and the cylindrical backwash filter (42) comprises: Cover (421); The main body (422) has an opening at one end. The cover (421) covers the main body (422) to block the opening and forms a filter space between the cover (421) and the main body (422). The side wall of the main body (422) has a set of corresponding through holes (4222). The brine pipeline (40) communicates with the filter space through the through holes (4222). A filter device, the filter device being columnar, is disposed within the filter space and spaced apart from the inner wall of the main body (422) to form an impurity chamber between them.

8. The ultrasonic saline concentration measuring device according to claim 7, characterized in that, The other end of the main body (422) has a drain hole (4221) that communicates with the filter space, and the backwash line (60) is connected to the drain hole (4221).

9. The ultrasonic saline concentration measuring device according to any one of claims 1 to 8, characterized in that, The ultrasonic saline concentration measuring device also includes an outlet pipeline (50), which is connected to the outlet (11), and an venting solenoid valve (51) is provided on the outlet pipeline (50).

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