A device and method for improving the accuracy of water quality detection results in flowing water areas

Abstract

This invention provides an apparatus and method for improving the accuracy of water quality testing results in flowing water areas, relating to the field of water quality testing technology. The apparatus for improving the accuracy of water quality testing results in flowing water areas includes a housing and a container inside the housing. A piston is slidably disposed inside the container along its axial direction to form a testing chamber. It also includes a first detection element, a second detection element, and a processor. First, a sample of a preset volume value is introduced into the testing chamber. The sample pushes the piston upward. The second detection element detects the actual displacement of the piston. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container. Then, it generates a supplementary volume value based on the difference between the actual volume value and the preset volume value, and introduces a sample of the supplementary volume value into the testing chamber to ensure that the volume of water in the sample is equal to the preset volume value, so that the actual volume of water in the sample is constant, avoiding the introduction of additional volume errors and ensuring the accuracy of subsequent testing results.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, and in particular to an apparatus and method for improving the accuracy of water quality testing results in flowing water areas. Background Technology

[0002] Water quality parameters in flowing water areas, such as natural rivers and artificial canals, are constantly and dynamically changing, necessitating continuous monitoring and accurate assessment of the aquatic environment. Currently, multi-parameter water quality analysis devices are commonly used to monitor the aquatic environment of flowing water areas. These devices typically employ an integrated design, combining a sample pretreatment unit, multiple water quality sensors, and data acquisition and transmission modules within a single enclosure, forming an online monitoring station. The device pumps the sample to be tested, which is then pretreated through pipelines by internal buffering or defoaming flow stabilization devices to reduce interference from air bubbles and other contaminants in the water. The treated sample is then guided through a series of sensors to achieve automatic and continuous measurement of key water quality parameters such as pH, dissolved oxygen, turbidity, conductivity, and specific ion concentrations. This highly integrated multi-parameter water quality analysis device provides continuous monitoring data, effectively overcoming the limitations of traditional manual sampling methods, which suffer from low frequency and data lag.

[0003] When using existing multi-parameter water quality analysis devices, air bubbles in the sample are removed after being processed by the pretreatment unit, resulting in a reduction in the actual volume of the sample. This introduces additional volume errors and affects the accuracy of subsequent test results.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a device and method to improve the accuracy of water quality testing results in flowing water areas, addressing the problems existing in current water quality analysis devices.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A device for improving the accuracy of water quality testing results in flowing water areas includes a housing. Inside the housing is a cylindrical container with a vertically aligned axis. A piston slides along the axial direction of the container, forming a sealed testing chamber between the piston and the container. The testing chamber contains a first detection element for detecting water quality parameters. A first inlet is located at the bottom of the container, through which a sample of a preset volume is introduced into the testing chamber. The sample pushes the piston upwards along the axial direction of the container. The housing also contains a second detection element and a processor. The second detection element detects the actual displacement of the piston. The processor generates the actual volume of the sample based on the actual displacement and the inner diameter of the container, and generates a supplementary volume value based on the difference between the actual volume value and the preset volume value. The supplementary volume sample is then introduced into the testing chamber through the first inlet.

[0008] Furthermore, a second inlet is provided at the bottom of the container, through which pure water or detection reagent is introduced into the detection chamber before the sample is introduced into the detection chamber.

[0009] Furthermore, the chamber is equipped with an actuating unit, which applies a first force upward along the container axis to the piston. A suspension component connected to the piston is provided in the detection chamber. Before pure water or detection reagent is introduced into the detection chamber, the first force is less than the sum of the weights of the piston and the suspension component. After pure water or detection reagent is introduced into the detection chamber, the suspension component is completely submerged in the pure water or detection reagent, and the buoyancy force on the suspension component is the second force. The sum of the first force and the second force is greater than the sum of the weights of the piston and the suspension component, causing the piston to move upward along the container axis or to have a tendency to move upward along the container axis, thereby generating negative pressure in the detection chamber.

[0010] Furthermore, the piston and the suspension component are arranged at intervals, and a discharge pipe is provided at the bottom of the container. The upper end of the discharge pipe protrudes from the bottom wall of the container and extends into the detection chamber.

[0011] Furthermore, the bottom wall of the container has a receiving groove, and the suspended part is located in the receiving groove before pure water or detection reagent is introduced into the detection chamber.

[0012] Furthermore, the actuating unit includes a counterweight, a pull rope, and a pulley. The counterweight and the piston are respectively connected to the two ends of the pull rope, and the pulley is used to guide the pull rope. The second detection element obtains the actual displacement of the piston by detecting the displacement of the counterweight.

[0013] Furthermore, the container is equipped with a stirring element that extends into the detection chamber to stir the sample.

[0014] Furthermore, the stirring component is a magnetic rod, and a central groove is provided on the bottom wall of the container to accommodate the stirring component. A magnetic motor is located below the container inside the box, and the magnetic motor is used to drive the stirring component to rotate in the central groove.

[0015] Furthermore, the box is equipped with two peristaltic pumps, the output ends of which are connected to the first liquid inlet and the second liquid inlet, respectively.

[0016] This invention also includes the following technical solutions:

[0017] A method for improving the accuracy of water quality testing results in flowing water areas includes the following steps:

[0018] A sample of a preset volume value is introduced into the detection chamber through the first inlet, and the sample can push the piston to move upward along the axial direction of the container.

[0019] The second detection component detects the actual displacement of the piston and sends the data to the processor.

[0020] The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container, and generates a supplementary volume value based on the difference between the actual volume value and the preset volume value.

[0021] A sample with a supplemental volume value is introduced into the detection chamber through the first inlet;

[0022] The first testing device measures the water quality parameters of the sample in the testing chamber.

[0023] The present invention has at least the following beneficial effects:

[0024] (1) First, a sample of a preset volume value is introduced into the detection chamber through the first liquid inlet. The sample pushes the piston to move upward along the axial direction of the container. The second detection element detects the actual displacement of the piston. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container. Then, a supplementary volume value is generated based on the difference between the actual volume value and the preset volume value. Finally, a sample of the supplementary volume value is introduced into the detection chamber through the first liquid inlet, thereby ensuring that the volume of water in the sample is equal to the preset volume value, that is, ensuring that the actual volume of water in the sample is constant, avoiding the introduction of additional volume errors, and ensuring the accuracy of subsequent detection results.

[0025] (2) The sum of the first force and the second force is greater than the sum of the weight of the piston and the suspension component. Their resultant force pulls the piston upward, so that the piston moves upward along the axial direction of the container or has a tendency to move upward along the axial direction of the container. However, the detection chamber is sealed and there are no bubbles in the pure water or detection reagent. The atmospheric pressure exerts a downward force on the piston, so that the piston is balanced and stationary. At the same time, a negative pressure is generated in the detection chamber, which facilitates the bubbles to detach from the sample and rise when the sample is introduced later. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of the device for improving the accuracy of water quality detection results in flowing water areas provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 The front view;

[0028] Figure 3 for Figure 1 Top view;

[0029] Figure 4 for Figure 3 Sectional view along axis AA;

[0030] Figure 5 for Figure 3 BB-direction sectional view;

[0031] Figure 6 for Figure 5 A magnified view of a section at point C.

[0032] in:

[0033] 101. Box body; 102. Container; 103. First detection element; 104. First liquid inlet; 105. Box door; 106. Second liquid inlet; 107. Discharge pipe;

[0034] 201. Piston; 202. Second detection component; 203. Suspension component; 204. Connecting rod; 205. Receiving groove; 206. Counterweight; 207. Pull rope; 208. Pulley; 209. Stirring component; 210. Magnetic motor; 211. Central groove; 212. Peristaltic pump. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 6 As shown, this embodiment of the invention provides a device for improving the accuracy of water quality testing results in flowing water areas. The device includes a housing 101, within which is a cylindrical container 102 with a vertically aligned axis. A piston 201 is slidably disposed within the container 102 along its axial direction, forming a sealed detection chamber between the piston 201 and the container 102. A first detection element 103 for detecting water quality parameters is disposed within the detection chamber. A first inlet 104 is located at the bottom of the container 102, through which a sample of a preset volume value is introduced into the detection chamber. The sample can push the piston 201 upward along the axial direction of the container 102. The housing 101 also includes a second detection element 202 and a processor. The second detection element 202 detects the actual displacement of the piston 201. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container 102, and generates a supplementary volume value based on the difference between the actual volume value and the preset volume value. The supplementary volume value sample is introduced into the detection chamber through the first inlet 104.

[0039] First, a sample of a preset volume value is introduced into the detection chamber through the first inlet 104. The sample pushes the piston 201 to move upward along the axis of the container 102. The second detection element 202 detects the actual displacement of the piston 201. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container 102. Then, it generates a supplementary volume value based on the difference between the actual volume value and the preset volume value. Finally, a sample of the supplementary volume value is introduced into the detection chamber through the first inlet 104, thereby ensuring that the volume of water in the sample is equal to the preset volume value, that is, ensuring that the actual volume of water in the sample is constant, avoiding the introduction of additional volume errors, and ensuring the accuracy of subsequent detection results.

[0040] The cabinet 101 has a hinged door 105 at its front opening to ensure the airtightness of the internal space. The first detection element 103 can integrate multiple sensors or detection units. For example, when detecting residual chlorine, the DPD colorimetric method can be used, where free chlorine reacts with DPD reagent to generate a red compound, and the concentration is determined by measuring the color intensity. Alternatively, the iodometric method can be used, where residual chlorine oxidizes potassium iodide under acidic conditions to generate iodine, and the precipitated iodine is then titrated with sodium thiosulfate to calculate the amount of residual chlorine. When detecting pH, the potentiometric method (pH meter) can be used, where the potential difference between the two electrodes (indicating electrode and reference electrode) is measured to obtain the pH value of the solution. When detecting conductivity, the conductivity analysis method can be used, where the conductivity between two electrodes placed in the solution is measured to indirectly reflect the total ion concentration in the water. When detecting ORP (oxidation-reduction potential), the potentiometric method (ORP electrode) can be used, where the ORP electrode is used to measure the potential of the solution relative to the reference electrode, reflecting the oxidizing or reducing trend of the solution. The structure and working principle of the first detection element 103 are existing technologies, and will not be described in detail here. Additionally, the piston 201 is disc-shaped, with an outer diameter less than or equal to the inner diameter of the container 102. A sealing ring is provided on the outer circumferential surface of the piston 201 to ensure the airtightness of the detection chamber. The second detection element 202 can be a laser displacement sensor, the structure and working principle of which are existing technologies, and will not be described in detail here.

[0041] For example, during a test, a sample of a preset volume value, such as 100 ml, is first introduced into the detection chamber through the first inlet 104. The sample pushes the piston 201 to move upward along the axial direction of the container 102. The second detection element 202 detects the actual displacement of the piston 201, for example, 11 cm. Since the inner diameter of the container 102 is known, the cross-sectional area of ​​the container 102 can be calculated, for example, 10 cm². 2 The actual volume is the product of the actual displacement and the cross-sectional area, which is 110 cm². 3 If the actual volume is 110ml, then the difference between the actual volume and the preset volume is 10ml. Therefore, the volume of air bubbles in a 100ml sample is 10ml. In this test sample, the proportion of air bubbles is 10 / 100 = 10%. The supplementary volume = air bubble volume / (1 - air bubble proportion) = 10 / (1 - 10%) ≈ 11.11ml. Therefore, 11.11ml of sample is finally introduced into the test chamber through the first inlet 104, so that the actual volume of water in the sample tested is 100ml.

[0042] In one embodiment, the bottom of the container 102 is provided with a second liquid inlet 106, through which pure water or detection reagent is introduced into the detection chamber before the sample is introduced into the detection chamber.

[0043] Before the sample is introduced, pure water or detection reagent is introduced into the detection chamber through the second liquid inlet 106. The pure water is used to dilute the sample to a certain extent so that the first detection element 103 can perform detection. The detection reagent is used to react with certain components in the sample and generate products that the first detection element 103 can detect, so as to facilitate subsequent detection processes.

[0044] It is understandable that the amount of pure water or detection reagent added to the detection chamber is known, so the replenishment volume can be calculated. In other words, the replenishment volume depends only on the preset volume of the sample added, and is independent of the amount of pure water or detection reagent added.

[0045] In one embodiment, the housing 101 is provided with an actuating part, which applies a first force upward along the axis of the container 102 to the piston 201. The detection chamber is provided with a suspension element 203 connected to the piston 201. Before pure water or detection reagent is introduced into the detection chamber, the first force is less than the sum of the weights of the piston 201 and the suspension element 203. After pure water or detection reagent is introduced into the detection chamber, the suspension element 203 is completely submerged in the pure water or detection reagent, and the buoyancy force on the suspension element 203 is the second force. The sum of the first force and the second force is greater than the sum of the weights of the piston 201 and the suspension element 203, causing the piston 201 to move upward along the axis of the container 102 or to have a tendency to move upward along the axis of the container 102, so as to generate negative pressure in the detection chamber.

[0046] The sum of the first and second forces is greater than the sum of the weights of the piston 201 and the suspension component 203. Their combined force pulls the piston 201 upward, causing it to move upward along the axial direction of the container 102 or to have a tendency to move upward along the axial direction of the container 102. However, the detection chamber is sealed and there are no air bubbles in the pure water or detection reagent. Atmospheric pressure exerts a downward force on the piston 201, so that the piston 201 is balanced and stationary. At the same time, a negative pressure is generated in the detection chamber, which facilitates the detachment and rise of air bubbles from the sample when the sample is subsequently introduced.

[0047] The suspending element 203 can be a solid or hollow structure that can be suspended in water by buoyancy. When the suspending element 203 is completely submerged, the buoyancy it receives is equal to its weight, so it can be suspended in water. The suspending element 203 is preferably annular, and its outer diameter is smaller than the inner diameter of the container 102.

[0048] It is worth noting that, due to the negative pressure within the detection chamber, when a sample of a preset volume is introduced into the detection chamber through the first inlet 104, the volume of the air bubbles in the sample differs from that under atmospheric pressure, resulting in a difference in the actual displacement of the piston 201. Because the detection chamber is under negative pressure, under atmospheric pressure, there is a pressure difference between the upper and lower surfaces of the piston 201, as shown by the following equation: First force + Second force = Weight of piston 201 + Weight of suspension component 203 + (Pressure difference × Lower surface area of ​​piston 201). Since the first force, second force, weight of piston 201, and weight of suspension component 203 are all known, the pressure difference can be calculated. From this, the negative pressure value within the detection chamber can be calculated. According to P1V1=P2V2, the actual volume of the air bubbles in the sample under normal pressure can be calculated.

[0049] Continuing the example above, under negative pressure, the volume of air bubbles in a 100ml sample is 10ml. For example, if the calculated pressure difference is 6kPa, then the negative pressure value in the detection chamber = 101kPa - 6kPa = 95kPa. Substituting this into P1V1 = P2V2, we get 101kPa × V1 = 95kPa × 10ml. Therefore, the actual volume of air bubbles in a 100ml sample under normal pressure is V1 ≈ 10.79ml. In this sample, the proportion of air bubbles is 10.79 / 100 = 10.79%. The supplementary volume value = air bubble volume / (1 - air bubble proportion) = 10 / (1 - 10.79%) ≈ 11.21ml. Therefore, 11.21ml of sample is finally introduced into the detection chamber through the first inlet 104, so that the actual volume of water in the sample tested is 100ml.

[0050] In one embodiment, the piston 201 and the suspension component 203 are arranged vertically at intervals, and the bottom of the container 102 is provided with a discharge pipe 107, the upper end of which protrudes from the bottom wall of the container 102 and extends into the detection chamber.

[0051] The piston 201 and the suspension component 203 are spaced apart vertically to ensure that the suspension component 203 is completely submerged in pure water or the detection reagent. Initially, before pure water or the detection reagent is introduced into the detection chamber, the suspension component 203 is located on the bottom wall of the container 102. At this time, air exists in the detection chamber. The distance between the upper end of the discharge pipe 107 and the bottom wall of the container 102 is less than or equal to the distance between the lower surface of the suspension component 203 and the lower surface of the piston 201, allowing the upper end of the discharge pipe 107 to almost contact the lower surface of the piston 201. During the introduction of pure water or the detection reagent into the detection chamber, the air in the detection chamber is gradually discharged through the discharge pipe 107. When the suspension component 203 is completely submerged in the pure water or the detection reagent, the liquid surface of the pure water or the detection reagent contacts the lower surface of the piston 201, meaning the detection chamber is filled, and the air in the detection chamber is completely discharged, closing the discharge pipe 107. Additionally, the discharge pipe 107 can also discharge pure water or the detection reagent, as well as the completed sample.

[0052] Among them, see Figure 6 A connecting rod 204 is provided between the piston 201 and the suspension component 203, and multiple connecting rods 204 are provided at equal intervals along their circumference. The discharge pipe 107 has a solenoid valve control switch, which is controlled by a processor to open or close the discharge pipe 107. The structure and working principle of the solenoid valve control switch are existing technologies and will not be described in detail in this application.

[0053] In one embodiment, the bottom wall of the container 102 is provided with a receiving groove 205. Before pure water or detection reagent is introduced into the detection chamber, the suspension element 203 is located in the receiving groove 205 to reduce the air volume in the detection chamber.

[0054] The cross-sectional shape of the receiving groove 205 matches the cross-sectional shape of the suspension component 203, and the shape of the receiving groove 205 is annular.

[0055] In one embodiment, see Figure 5 The actuating part includes a counterweight 206, a pull rope 207, and a pulley 208. The counterweight 206 and the piston 201 are respectively connected to the two ends of the pull rope 207. The pulley 208 is used to guide the pull rope 207. The second detection element 202 obtains the actual displacement of the piston 201 by detecting the displacement of the counterweight 206.

[0056] Two pulleys 208 are provided, both rotatably mounted inside the housing 101, to guide the pull rope 207 from inside the container 102 to the outside of the container 102, thereby positioning the counterweight 206 outside the container 102. The weight of the pull rope 207 is negligible, and the weight of the counterweight 206 is equal to the first force. The downward displacement of the counterweight 206 is equal to the upward displacement of the piston 201, thus the second detection element 202 obtains the actual displacement of the piston 201 by detecting the displacement of the counterweight 206.

[0057] One end of the pull rope 207 is connected to the counterweight 206, and the other end is connected to the upper end of the first detection element 103. The first detection element 103 is mounted on the piston 201, and its lower end passes through the piston 201 and extends into the detection chamber. It is worth noting that when using the gravity of the piston 201 and the suspension element 203 for calculations, the gravity of the first detection element 103 must also be considered to ensure accurate calculation results. Additionally, the second detection element 202 is located directly below the counterweight 206, with its actuating end aligned with the counterweight 206 to detect the displacement of the counterweight 206. The weight of the counterweight 206 can be changed to alter the magnitude of the first force, thereby changing the air pressure difference between the upper and lower surfaces of the piston 201. This allows for setting the negative pressure value within the detection chamber as needed, facilitating calculations.

[0058] The housing 101 also contains a storage module connected to the processor. This storage module stores the gravity values ​​of the piston 201, the suspension component 203, and the counterweight 206, as well as the relevant dimensional values ​​of the container 102 and the piston 201. It also stores other parameters such as atmospheric pressure. The specific form and working principle of the storage module are existing technologies and will not be elaborated upon in this application.

[0059] In one embodiment, the container 102 is provided with a stirrer 209, which extends into the detection chamber to stir the sample, further facilitating the detachment and rise of air bubbles from the sample.

[0060] In one embodiment, the stirring element 209 is a magnetic rod, and the bottom wall of the container 102 is provided with a central groove 211 for accommodating the stirring element 209. The box body 101 is provided with a magnetic motor 210 located below the container 102, and the magnetic motor 210 is used to drive the stirring element 209 to rotate in the central groove 211.

[0061] The magnetic stirring method provides good stirring effect, and since it is not physically connected to the container 102, it ensures that the detection chamber has good sealing performance.

[0062] The magnetic motor 210 and the magnetic rod work together, and their structure and working principle are existing technologies, which will not be described in detail in this application.

[0063] In one embodiment, the housing 101 is provided with two peristaltic pumps 212, and the output ends of the two peristaltic pumps 212 are respectively connected to the first liquid inlet 104 and the second liquid inlet 106.

[0064] One peristaltic pump 212 introduces pure water or detection reagent into the detection chamber through the second inlet 106, while the other peristaltic pump 212 introduces a sample of a preset volume into the detection chamber through the first inlet 104. The peristaltic pump 212 has a simple structure, high accuracy in liquid delivery, and convenient flow rate adjustment.

[0065] The peristaltic pump 212 includes a driver, a pump head, and a hose. The driver includes a controller and a motor, which controls the speed and direction, thereby determining the pumping direction and flow rate. Each controller of the peristaltic pump 212 is connected to a processor, allowing the processor to control the pumping volume per cycle. The pump head, consisting of a rotor and rollers, is the mechanism for the peristaltic motion. The hose is the channel for fluid transport and the only component in contact with the fluid; it must possess properties such as elasticity, wear resistance, and corrosion resistance. The working principle of the peristaltic pump 212 is as follows: the driver drives the rotor in the pump head to rotate. The evenly distributed rollers on the rotor sequentially squeeze the elastic hose. At the point of compression, the hose closes, propelling the fluid forward. After the rollers pass, the hose recovers its original elasticity, creating negative pressure and drawing in subsequent fluid, thus achieving continuous fluid delivery. The structure and working principle of the peristaltic pump 212 are existing technologies and will not be elaborated upon in this application.

[0066] This invention also provides a method for improving the accuracy of water quality testing results in flowing water areas, comprising the following steps:

[0067] A sample of a preset volume value is introduced into the detection chamber through the first liquid inlet 104, and the sample can push the piston 201 to move upward along the axis of the container 102.

[0068] The second detection element 202 detects the actual displacement of piston 201 and sends it to the processor;

[0069] The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of container 102, and generates a supplementary volume value based on the difference between the actual volume value and the preset volume value.

[0070] A sample with a supplemental volume value is introduced into the detection chamber through the first liquid inlet 104;

[0071] The first testing component 103 tests the water quality parameters of the sample in the testing chamber.

[0072] The working principle of this invention is as follows:

[0073] Pure water or detection reagent is introduced into the detection chamber through one of the peristaltic pumps 212 and the second inlet 106, so that the suspension element 203 is completely submerged in the pure water or detection reagent. The buoyancy force on the suspension element 203 is the second force. The air in the detection chamber is gradually discharged through the discharge pipe 107. When the suspension element 203 is completely submerged in the pure water or detection reagent, the liquid surface of the pure water or detection reagent is in contact with the lower surface of the piston 201, that is, the detection chamber is filled, and at the same time, the air in the detection chamber is also completely discharged. The first force... The sum of the second force and the weight of the piston 201 and the suspension component 203 is greater than the sum of their weights. The resultant force pulls the piston 201 upward, causing it to move upward along the axial direction of the container 102 or to have a tendency to move upward along the axial direction of the container 102. However, the detection chamber is sealed and there are no air bubbles in the pure water or detection reagent. Atmospheric pressure exerts a downward force on the piston 201 to keep it in equilibrium and stationary. At the same time, a negative pressure is generated in the detection chamber, which facilitates the detachment and rise of air bubbles from the sample when the sample is subsequently introduced.

[0074] A sample of a preset volume value is introduced into the detection chamber through another peristaltic pump 212 and the first inlet 104. Simultaneously, the magnetic motor 210 drives the stirring element 209 to rotate, thereby agitating the sample and facilitating the detachment and rise of air bubbles. The sample pushes the piston 201 upward along the axial direction of the container 102. The second detection element 202 obtains the actual displacement of the piston 201 by detecting the displacement of the counterweight 206. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container 102, and then calculates the difference between the actual volume value and the preset volume value, which is the air bubble volume of the sample of the preset volume value under negative pressure in the detection chamber. The volume of this difference under normal pressure can also be calculated, which is the supplementary volume value. Finally, the sample of the supplementary volume value is introduced into the detection chamber through another peristaltic pump 212 and the first inlet 104, thereby ensuring that the volume of water in the sample is equal to the preset volume value, that is, ensuring that the actual volume of water in the sample is constant, avoiding the introduction of additional volume errors, and ensuring the accuracy of subsequent detection results.

[0075] The water quality parameters of the sample in the detection chamber are detected by the first detection element 103, and then the sample is discharged through the discharge pipe 107.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for improving the accuracy of water quality testing results in flowing water areas, characterized in that, The device includes a housing, inside which is a cylindrical container with a vertical axis. A piston slides along the axis of the container, forming a sealed detection chamber between the piston and the container. The detection chamber contains a first detection element for detecting water quality parameters. The bottom of the container has a first liquid inlet, through which a sample of a preset volume is introduced into the detection chamber. The sample can push the piston to move upward along the axis of the container. The chamber is also equipped with a second detection element and a processor. The second detection element is used to detect the actual displacement of the piston. The processor can generate the actual volume value of the sample based on the actual displacement and the inner diameter of the container, and generate a supplementary volume value based on the difference between the actual volume value and the preset volume value. The supplementary volume value of the sample is introduced into the detection chamber through the first liquid inlet. The chamber is equipped with an actuating unit that applies a first force upward along the container axis to the piston. A suspension component connected to the piston is provided in the detection chamber. Before pure water or detection reagent is introduced into the detection chamber, the first force is less than the sum of the weights of the piston and the suspension component. After pure water or detection reagent is introduced into the detection chamber, the suspension component is completely submerged in the pure water or detection reagent, and the buoyancy force on the suspension component is the second force. The sum of the first force and the second force is greater than the sum of the weights of the piston and the suspension component, causing the piston to move upward along the container axis or to have a tendency to move upward along the container axis, thereby generating negative pressure in the detection chamber. The piston and the suspension component are arranged at intervals. The bottom of the container is provided with a discharge pipe, the upper end of which protrudes from the bottom wall of the container and extends into the detection chamber. The bottom wall of the container is provided with a receiving groove. Before pure water or detection reagent is introduced into the detection chamber, the suspension component is located in the receiving groove. The actuating part includes a counterweight, a pull rope, and a pulley. The counterweight and the piston are respectively connected to the two ends of the pull rope. The pulley is used to guide the pull rope. The second detection component obtains the actual displacement of the piston by detecting the displacement of the counterweight.

2. The device for improving the accuracy of water quality testing results in flowing water areas according to claim 1, characterized in that, The container has a second inlet at the bottom. Before the sample is introduced into the detection chamber, pure water or detection reagent is introduced into the detection chamber through the second inlet.

3. The device for improving the accuracy of water quality testing results in flowing water areas according to claim 1, characterized in that, The container is equipped with a stirrer that extends into the detection chamber to stir the sample.

4. The device for improving the accuracy of water quality testing results in flowing water areas according to claim 3, characterized in that, The stirring component is a magnetic rod. A central groove is provided on the bottom wall of the container to accommodate the stirring component. A magnetic motor is located below the container inside the box. The magnetic motor is used to drive the stirring component to rotate in the central groove.

5. The device for improving the accuracy of water quality testing results in flowing water areas according to claim 2, characterized in that, The chamber is equipped with two peristaltic pumps, and the output ends of the two peristaltic pumps are connected to the first liquid inlet and the second liquid inlet, respectively.

6. A method for improving the accuracy of water quality testing results in flowing water areas, applied to the apparatus for improving the accuracy of water quality testing results in flowing water areas as described in any one of claims 1 to 5, characterized in that, Includes the following steps: A sample of a preset volume value is introduced into the detection chamber through the first inlet, and the sample can push the piston to move upward along the axial direction of the container. The second detection component detects the actual displacement of the piston and sends the data to the processor. The processor generates the actual volume value of the sample based on the actual displacement and the inner diameter of the container, and generates a supplementary volume value based on the difference between the actual volume value and the preset volume value. A sample with a supplemental volume value is introduced into the detection chamber through the first inlet; The first testing device measures the water quality parameters of the sample in the testing chamber.

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