Water quality detection on-line instrument signal testing system and testing method thereof

Abstract

The invention discloses a water quality detection on-line instrument signal test system and a signal test method thereof, and the system comprises a detection pipe, a to-be-detected water pipeline, a deionized water pipeline, a plurality of verification water piston pipes and a plurality of control valve groups, each verification water piston pipe comprises a cylindrical piston cavity and a piston moving in the cylindrical piston cavity, a first water passing opening and a second water passing opening are formed in the two ends of each verification water piston pipe, and the multiple detection probes and the control valve set are connected with the detection control terminal. The to-be-detected water pipeline, the deionized water pipeline, the verification water piston pipe and the detection pipe water inlet are switched by the control valve group to form at least four passages, and the passages comprise a detection passage, a cleaning passage, a first verification passage and a second verification passage. The water quality detection on-line instrument signal testing system has the function of detecting the accuracy of sensor signals, and faults of on-line water quality detection equipment can be found in time for maintenance and replacement.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality detection systems, and in particular relates to a water quality detection online instrument signal testing system and a testing method thereof. Background Art

[0002] With economic development and population growth, water shortages, water pollution and other problems are becoming increasingly serious, and people are paying more and more attention to water quality. For example, in some industrially developed areas, due to long-term industrial activities, the surrounding water bodies have been polluted to varying degrees, which has prompted people to urgently monitor water quality in real time and accurately in order to understand the changes in water quality and take corresponding protective measures. Traditional water quality testing usually requires manual sampling and then sending it to the laboratory for analysis. This method has problems such as long testing cycle, untimely data, and high labor costs. Moreover, for some scenarios that require real-time monitoring of water quality changes, such as sewage treatment processes and drinking water sources, traditional detection methods cannot meet the needs. Therefore, a technology and equipment that can monitor water quality in real time and continuously is needed.

[0003] With the continuous development of sensor technology, communication technology, automation technology, etc., technical support has been provided for the research and development and application of online water quality detection instruments. For example, new sensors can detect water quality parameters more accurately and sensitively, communication technology can realize remote transmission and real-time monitoring of data, and automation technology makes the operation and maintenance of instruments more convenient. It can continuously monitor various parameters in the water body, such as pH value, dissolved oxygen, turbidity, conductivity, temperature, ammonia nitrogen, total phosphorus, etc., and provide real-time feedback on changes in water quality. This is of great significance for some industries with high requirements for water quality, such as drinking water production and aquaculture.

[0004] Water quality detection online instruments can be installed at industrial wastewater discharge outlets, river estuaries and other locations to monitor pollution sources. In the event of sudden water pollution incidents, water quality data can be quickly obtained to help relevant departments understand the degree, scope and trend of pollution in a timely manner, and provide a scientific basis for emergency response decisions. Water quality data can be continuously recorded to form long-term historical data records. These data are of great value for analyzing the long-term trend of water quality and evaluating the effectiveness of water environment protection measures.

[0005] Existing online water quality testing equipment generally uses various sensors to perform testing at specific intervals, and provides real-time feedback on various water quality parameters, thereby achieving real-time water quality testing. However, the sensors of such online water quality testing equipment may have problems with scaling, corrosion, electrical contact or service life, leading to errors in testing parameters or loss of testing signals during long-term use. However, existing testing equipment cannot detect errors in testing parameters in a timely manner, which may result in errors in the parameters measured over a period of time. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an online water quality detection instrument signal testing system and a testing method thereof. The online water quality detection instrument signal testing system and the testing method thereof have the function of detecting the accuracy of sensor signals, thereby being able to timely discover faults in online water quality detection equipment for repair and replacement.

[0007] In order to solve the above technical problems, the present invention is solved through the following technical solutions: an online instrument signal testing system for water quality detection, including a detection tube with a water inlet and a water outlet, a plurality of detection probes are arranged in the detection tube, the online instrument signal testing system for water quality detection also includes a water pipeline to be tested, a deionized water pipeline, a plurality of calibration water piston tubes and a plurality of control valve groups, the plurality of calibration water piston tubes include a cylindrical piston cavity and a piston movable inside the cavity, a first water port and a second water port are arranged at both ends of the calibration water piston tube, the plurality of detection probes and the control valve group are connected to a detection control terminal, the water pipeline to be tested and the deionized water pipeline are connected to a detection control terminal, and the water pipeline to be tested and the deionized water pipeline are connected to a detection control terminal. At least four passages are formed by switching between the verification water piston tube and the water inlet of the detection tube by the control valve group, and the passages include a detection passage connecting the water pipeline to be tested with the water inlet of the detection tube; a cleaning passage connecting the deionized water pipeline with the water inlet of the detection tube; a first verification passage connecting the water pipeline to be tested with the first water port of the verification water piston tube, and the second water port of the verification water piston tube is connected to the water inlet of the detection tube; a second verification passage connecting the water pipeline to be tested with the second water port of the verification water piston tube, and the first water port of the verification water piston tube is connected to the water inlet of the detection tube. When this water quality detection online instrument signal test system is in use, the water to be tested is connected to the water pipeline to be tested, and the water quality of the water to be tested is detected by the detection probe in the detection tube. During the detection, the deionized water pipeline can be connected to the water inlet of the detection tube by switching the control valve group, so as to clean the inside of the detection tube and the detection probe. The detection result of the water quality detection online instrument will change with the change of the water quality in the water pipeline to be tested. Therefore, the water in the detection tube can be stored in the verification water piston tube as verification water. According to the detection data of the water to be tested, when new water to be tested is subsequently stored in the verification water piston tube as verification water, the verification water in the previous verification water piston tube is squeezed out from the other water outlet of the verification water piston tube into the detection tube to be tested and verified with the detection data of the verification water used as the water to be tested last time. If the detection data are the same, it means that the detection probe is normal. If the detection data are the same, it means that the detection probe is abnormal, indicating that it needs to be repaired and replaced, so that the water quality detection online instrument signal test system has the function of detecting the accuracy of the sensor signal, and can timely discover the fault of the online water quality detection equipment for repair and replacement.

[0008] In the above technical solution, preferably, the water quality detection online instrument signal test system includes two parallel detection tubes. Through two groups of detection probes of two parallel detection tubes, when one group of detection probes is abnormally calibrated, the data of a group of detection probes that are calibrated normally can still be used as correct detection data.

[0009] In the above technical scheme, preferably, the control valve group includes a first reversing valve and a second reversing valve connected in series, the first reversing valve controls the water inlet or disconnection from the water pipe to be tested or the deionized water pipe, and the second reversing valve controls the water outlet of the first reversing valve to be connected to the first water outlet of the calibration water piston tube, and the second water outlet is connected to the water inlet of the detection tube; or the water outlet of the first reversing valve is connected to the second water outlet of the calibration water piston tube, and the first water outlet is connected to the water inlet of the detection tube; or water is directly discharged from the water outlet of the first reversing valve to the water inlet of the detection tube.

[0010] In the above technical solution, preferably, the first reversing valve and the second reversing valve are both solenoid valves.

[0011] In the above technical solution, preferably, the first reversing valve is a three-position three-way reversing valve, the middle position of the three-position three-way reversing valve is the disconnected position, and the two side positions respectively take in water from the water pipeline to be tested and the deionized water pipeline.

[0012] In the above technical scheme, preferably, the second reversing valve is a three-position four-way reversing valve, the middle water inlet of the three-position four-way reversing valve is directly connected to the detection tube, and the two side positions are respectively the water outlet of the first reversing valve connected to the first water port of the calibration water piston tube, and the second water port is connected to the water inlet of the detection tube; and the water outlet of the first reversing valve is connected to the second water port of the calibration water piston tube, and the first water port is connected to the water inlet of the detection tube.

[0013] The testing method of the above-mentioned water quality detection online instrument signal testing system includes the following steps: 1) the control valve group is switched to the detection passage, and the water to be tested in the water pipe to be tested enters the detection tube, and is detected by a plurality of detection probes and the parameters are recorded; 2) the control valve group is switched to the cleaning passage, and the deionized water in the deionized water pipe enters the detection tube to clean the detection tube and the detection probe; 3) the control valve group is switched to the first verification passage or the second verification passage, and the water to be tested in the water pipe to be tested enters the verification water piston tube as the subsequent verification water, and the verification water previously located in the verification water piston tube is discharged to the detection tube and is detected by a plurality of detection probes and the parameters are recorded, and the recorded parameters are compared with the parameters of the water to be tested measured when the verification water enters the verification water piston tube. If the parameters are consistent, the detection result signal meets the requirements and the detection probe is normal; if the parameters are inconsistent, the detection signal does not meet the requirements and the detection probe is abnormal.

[0014] In the above technical scheme, preferably, the water quality detection online instrument signal test system includes two parallel detection tubes, and several detection probes in the two detection tubes are tested separately as a group. When performing step 3) calibration, if only one group of detection probe parameters are compared and consistent with the test water parameters measured when the calibration water enters the calibration water piston tube, then the detection result signal of the corresponding detection tube meets the requirements and the detection probe is normal, and the detection parameters of this group of detection tubes are used as the detection results; the detection signal of the other detection probe does not meet the requirements and indicates that the detection probe is abnormal.

[0015] Compared with the prior art, the present invention has the following beneficial effects: when the water quality detection online instrument signal test system is in use, the water to be detected is connected to the water to be detected by the detection probe in the detection tube, and the deionized water pipeline can be connected to the water inlet of the detection tube by switching the control valve group during the detection, so as to clean the inside of the detection tube and the detection probe, and the detection result of the water quality detection online instrument will change with the change of the water quality in the water to be detected pipeline, so the water in the detection tube can be stored in the calibration water piston tube as calibration water, and the detection data of the water to be detected can be used to detect the water quality of the water to be detected. According to the method, when the new water to be tested is subsequently stored in the calibration water piston tube as calibration water, the calibration water in the previous calibration water piston tube is squeezed out from the other water outlet of the calibration water piston tube into the detection tube to be tested and verified with the detection data of the calibration water last used as the water to be tested. If the detection data are the same, it means that the detection probe is normal. If the detection data are the same, it means that the detection probe is abnormal, indicating that it needs to be repaired and replaced. Thereby, the water quality detection online instrument signal test system has the function of detecting the accuracy of sensor signals, and can promptly discover the faults of online water quality detection equipment for repair and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the system connection structure of an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the calibration water piston tube in an embodiment of the present invention.

[0018] Figure 3 It is a partial schematic diagram of the control valve group when it is switched to open circuit in an embodiment of the present invention.

[0019] Figure 4 It is a partial schematic diagram of the control valve group when it is switched to the detection passage in the embodiment of the present invention.

[0020] Figure 5 It is a partial schematic diagram of the control valve group when it is switched to a cleaning passage in an embodiment of the present invention.

[0021] Figure 6 It is a partial schematic diagram of the control valve group switching to the first verification passage in an embodiment of the present invention.

[0022] Figure 7 It is a partial schematic diagram of the control valve group switching to the second verification passage in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 7 The water quality detection online instrument signal test system comprises a detection tube 1 with a water inlet and a water outlet, a plurality of detection probes 2 are arranged in the detection tube 1, the water quality detection online instrument signal test system also comprises a water pipeline to be tested 3, a deionized water pipeline 4, a plurality of calibration water piston tubes 5 and a plurality of control valve groups 6, the plurality of calibration water piston tubes 5 comprise a cylindrical piston cavity 51 and a piston 52 movable therein, a first water port 53 and a second water port 54 are arranged at both ends of the calibration water piston tube 5, a plurality of detection probes 2 and a control valve group 6 are connected to a detection control terminal, the water pipeline to be tested 3, the deionized water pipeline 4 and the calibration water piston tube 5 comprise a cylindrical piston cavity 51 and a piston 52 movable therein, a first water port 53 and a second water port 54 are arranged at both ends of the calibration water piston tube 5, a plurality of detection probes 2 and a control valve group 6 are connected to a detection control terminal, At least four passages are formed by switching between the stopper tube 5 and the water inlet of the detection tube 1 by the control valve group 6, and the passages include a detection passage connecting the water pipeline 3 to be tested with the water inlet of the detection tube 1; a cleaning passage connecting the deionized water pipeline 4 with the water inlet of the detection tube 1; a first verification passage connecting the water pipeline 3 to be tested with the first water opening 53 of the verification water piston tube 5, and the second water opening 54 of the verification water piston tube 5 is connected to the water inlet of the detection tube 1; a second verification passage connecting the water pipeline 3 to be tested with the second water opening 54 of the verification water piston tube 5, and the first water opening 53 of the verification water piston tube 5 is connected to the water inlet of the detection tube 1. When this water quality detection online instrument signal test system is in use, the water to be tested is connected to the water to be tested in the water pipe 3, and the water quality of the water to be tested is detected by the detection probe 2 in the detection tube 1. During the detection, the deionized water pipe 4 can be switched to the water inlet of the detection tube 1 by the control valve group 6, so as to clean the inside of the detection tube 4 and the detection probe 2. The detection result of the water quality detection online instrument will change with the change of the water quality in the water pipe 3 to be tested. Therefore, the water in the detection tube 1 can be stored in the calibration water piston tube 5 as calibration water. When the water to be tested is stored in the calibration water piston tube 5 as calibration water, the calibration water in the previous calibration water piston tube 5 is squeezed out from the other water outlet of the calibration water piston tube 5 into the detection tube 1 to be tested and verified with the detection data of the calibration water used as the water to be tested last time. If the detection data are the same, it means that the detection probe 2 is normal. If the detection data are the same, it means that the detection probe 2 is abnormal, indicating that it needs to be repaired and replaced. Thereby, the water quality detection online instrument signal test system has the function of detecting the accuracy of the sensor signal, and can promptly discover the fault of the online water quality detection equipment for repair and replacement.

[0024] The detection probes 2 in this embodiment may include pH sensor probes, turbidity sensor probes, ammonia nitrogen sensor probes, residual chlorine sensor probes, dissolved oxygen sensor probes, chemical oxygen demand sensor probes, chlorophyll sensor probes, blue-green algae sensor probes and conductivity sensor probes, etc. The number and type of the detection probes 2 can be selected according to the actual situation of the water to be tested.

[0025] In this embodiment, from Figure 1 As can be seen, there are multiple calibration water piston tubes 5 and control valve groups 6. Since the difference in water quality between two adjacent tests is often small, the preferred solution is to circulate the calibration water piston tubes 5 and control valve groups 6 in sequence for testing. The calibration water piston tubes 5 circulate in sequence to store water to be tested as calibration water and squeeze out the calibration water stored last time for testing and calibration.

[0026] In this embodiment, the water quality detection online instrument signal test system includes two parallel detection tubes 1. Through two groups of detection probes 2 of the two parallel detection tubes 1, when one group of detection probes 2 is abnormally calibrated, the data of a group of detection probes 2 that are calibrated normally can still be used as correct detection data.

[0027] In this embodiment, see Figures 4 to 7 The control valve group 6 includes a first reversing valve 7 and a second reversing valve 8 connected in series. The first reversing valve 7 controls the water inlet or disconnection from the water pipe 3 to be tested or the deionized water pipe 4. The second reversing valve 8 controls the water outlet of the first reversing valve 7 to be connected to the first water port 53 of the calibration water piston tube 5, and the second water port 54 to be connected to the water inlet of the detection tube 1; or the water outlet of the first reversing valve 7 is connected to the second water port 54 of the calibration water piston tube 5, and the first water port 53 is connected to the water inlet of the detection tube 1; or water is directly discharged from the water outlet of the first reversing valve 7 to the water inlet of the detection tube 1.

[0028] In this embodiment, for the convenience of control, both the first reversing valve 7 and the second reversing valve 8 are solenoid valves. Both the first reversing valve 7 and the second reversing valve 8 can be controlled by the detection control terminal.

[0029] In this embodiment, see Figures 4 to 7 The first reversing valve 7 is a three-position three-way reversing valve, the middle position of which is an off position, and water enters from the water pipeline 3 to be tested and the deionized water pipeline 4 on both sides respectively.

[0030] In this embodiment, see Figures 4 to 7The second reversing valve 8 is a three-position four-way reversing valve. The middle water inlet of the three-position four-way reversing valve is directly connected to the detection tube 1, and the two side positions are respectively the water outlet of the first reversing valve 7 connected to the first water port 53 of the calibration water piston tube 5, and the second water port 54 is connected to the water inlet of the detection tube 1; and the water outlet of the first reversing valve 7 is connected to the second water port 54 of the calibration water piston tube 5, and the first water port 53 is connected to the water inlet of the detection tube 1.

[0031] Of course, it is easy to understand for those skilled in the art that the first reversing valve 7 and the second reversing valve 8 can be designed to be different from those in the present embodiment. Figures 4 to 7 The structure shown can be used to implement the present invention as long as it can realize the four types of paths and disconnections as described in this embodiment through switching.

[0032] In this embodiment, the testing method of the water quality detection online instrument signal testing system includes the following steps: 1) the control valve group 6 is switched to the detection passage, and the water to be tested in the water pipe 3 to be tested enters the detection tube 1, and is detected by a plurality of detection probes 2 and the parameters are recorded; 2) the control valve group 6 is switched to the cleaning passage, and the deionized water in the deionized water pipe 4 enters the detection tube 1 to clean the detection tube 1 and the detection probe 2; 3) the control valve group 6 is switched to the first verification passage or the second verification passage, and the water to be tested in the water pipe 3 to be tested enters the verification water piston tube 5 as the subsequent verification water, and the verification water previously located in the verification water piston tube 5 is discharged to the detection tube 1 and is detected by a plurality of detection probes 2 and the parameters are recorded, and the recorded parameters are compared with the parameters of the water to be tested measured when the verification water enters the verification water piston tube 5. If the parameters are consistent, the detection result signal meets the requirements and the detection probe 2 is normal; if the parameters are inconsistent, the detection signal does not meet the requirements and the detection probe 2 is abnormal. 4) The control valve group 6 is switched to the cleaning passage, and the deionized water in the deionized water pipe 4 enters the detection tube 1 to clean the detection tube 1 and the detection probe 2; 5) The control valve group 6 is switched to the disconnection state to store the detection probe 2 in the deionized water. The data of the detection probe 2 are read after the water to be tested or the calibration water completely fills the detection tube 1 and the value is stable.

[0033] This water quality detection online instrument signal testing system has the function of detecting the accuracy of sensor signals and can timely discover faults in online water quality detection equipment for repair and replacement.

[0034] The water quality detection online instrument signal test system includes two parallel detection tubes 1, and several detection probes 2 in the two detection tubes 1 are tested separately as a group. When performing step 3) calibration, if only the parameters of one group of detection probes 2 are compared and consistent with the parameters of the water to be tested measured when the calibration water enters the calibration water piston tube 5, then the detection result signal of the corresponding detection tube 1 meets the requirements and the detection probe 2 is normal, and the detection parameters of this group of detection tubes 1 are used as the detection results; the detection signal of the other detection probe 2 does not meet the requirements and indicates that the detection probe 2 is abnormal.

[0035] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water quality detection online instrument signal testing system, comprising a detection tube (1) having a water inlet and a water outlet, wherein a plurality of detection probes (2) are arranged in the detection tube (1), characterized in that: The water quality detection online instrument signal test system also includes a water pipeline to be tested (3), a deionized water pipeline (4), a plurality of calibration water piston tubes (5) and a plurality of control valve groups (6). The plurality of calibration water piston tubes (5) include a cylindrical piston cavity (51) and a piston (52) movable inside the cylinder. The calibration water piston tubes (5) are provided with a first water opening (53) and a second water opening (54) at both ends. The plurality of detection probes (2) and the control valve group (6) are connected to a detection control terminal. The water pipeline to be tested (3), the deionized water pipeline (4) and the calibration water piston tube (5) are switched with the water inlet of the detection tube (1) by the control valve group (6) to form at least four A passage, the passage comprising a detection passage connecting the water pipeline to be tested (3) with the water inlet of the detection tube (1); a cleaning passage connecting the deionized water pipeline (4) with the water inlet of the detection tube (1); a first verification passage connecting the water pipeline to be tested (3) with the first water through port (53) of the verification water piston tube (5), and connecting the second water through port (54) of the verification water piston tube (5) with the water inlet of the detection tube (1); and a second verification passage connecting the water pipeline to be tested (3) with the second water through port (54) of the verification water piston tube (5), and connecting the first water through port (53) of the verification water piston tube (5) with the water inlet of the detection tube (1).

2. The water quality detection online instrument signal testing system as claimed in claim 1, characterized in that: The water quality detection online instrument signal testing system comprises two parallel detection tubes (1).

3. The water quality detection online instrument signal testing system as claimed in claim 1, characterized in that: The control valve group (6) comprises a first reversing valve (7) and a second reversing valve (8) connected in series, wherein the first reversing valve (7) controls water inlet or water disconnection from the water pipe to be tested (3) or the deionized water pipe (4), and the second reversing valve (8) controls the water outlet of the first reversing valve (7) to be connected to the first water outlet (53) of the calibration water piston pipe (5), and the second water outlet (54) to be connected to the water inlet of the detection pipe (1); or the water outlet of the first reversing valve (7) is connected to the second water outlet (54) of the calibration water piston pipe (5), and the first water outlet (53) is connected to the water inlet of the detection pipe (1); or water is directly discharged from the water outlet of the first reversing valve (7) to the water inlet of the detection pipe (1).

4. The water quality detection online instrument signal testing system as claimed in claim 3, characterized in that: The first reversing valve (7) and the second reversing valve (8) are both solenoid valves.

5. The water quality detection online instrument signal testing system as claimed in claim 3, characterized in that: The first reversing valve (7) is a three-position three-way reversing valve, the middle position of the three-position three-way reversing valve is an off position, and the two side positions respectively allow water to flow in from the water pipeline to be tested (3) and the deionized water pipeline (4).

6. The water quality detection online instrument signal testing system as claimed in claim 3, characterized in that: The second reversing valve (8) is a three-position four-way reversing valve, the middle water inlet of the three-position four-way reversing valve is directly connected to the detection tube (1), and the two side positions are respectively the water outlet of the first reversing valve (7) connected to the first water port (53) of the calibration water piston tube (5), and the second water port (54) connected to the water inlet of the detection tube (1); and the water outlet of the first reversing valve (7) is connected to the second water port (54) of the calibration water piston tube (5), and the first water port (53) is connected to the water inlet of the detection tube (1).

7. The testing method of the water quality detection online instrument signal testing system as claimed in claim 1, characterized in that: The following steps are involved: 1) The control valve group (6) is switched to the detection passage, and the water to be tested in the water pipeline (3) to be tested enters the detection tube (1) and is detected by the plurality of detection probes (2) and the parameters are recorded; 2) The control valve group (6) is switched to the cleaning passage, and the deionized water in the deionized water pipeline (4) enters the detection tube (1) to clean the detection tube (1) and the detection probe (2); 3) The control valve group (6) is switched to the first verification passage or the second verification passage, and the water to be tested in the water pipeline (3) to be tested enters the verification water piston tube (5) as subsequent verification water, and the verification water previously located in the verification water piston tube (5) is discharged into the detection tube (1) and is detected by the plurality of detection probes (2) and the parameters are recorded, and the recorded parameters are compared with the parameters of the water to be tested measured when the verification water enters the verification water piston tube (5), and if the parameters are consistent, the detection result signal meets the requirements and the detection probe (2) is normal; If the parameters are inconsistent, the detection signal does not meet the requirements and indicates that the detection probe (2) is abnormal.

8. The testing method of the water quality detection online instrument signal testing system as claimed in claim 7, characterized in that: The water quality detection online instrument signal test system comprises two parallel detection tubes (1), and a plurality of detection probes (2) in the two detection tubes (1) are tested separately as a group. When the calibration of step 3) is performed, if only the parameters of one group of detection probes (2) are compared and consistent with the parameters of the water to be tested measured when the calibration water enters the calibration water piston tube (5), the detection result signal of the corresponding detection tube (1) meets the requirements and the detection probe (2) is normal, and the detection parameters of the group of detection tubes (1) are used as the detection results; the detection signal of the other detection probe (2) does not meet the requirements and indicates that the detection probe (2) is abnormal.

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