Water quality monitor capable of automatically calibrating sensor

Abstract

The invention discloses a water quality monitor capable of automatically calibrating a sensor, which comprises a water source water taking pump, an internal circulation water supply tank, an internal circulation detection calibration system, a display and input module, a networking control module and a power supply conversion module, the internal circulation detection calibration system comprises an internal circulation water pump, a turbidity detector, a pre-filter and a self-cleaning water quality detector, the water source water taking pump is connected with the internal circulation water supply tank and the pre-filter, the internal circulation water supply tank is connected with the internal circulation water pump of the internal circulation detection calibration system, the internal circulation water pump is connected with the turbidity detector, and the self-cleaning water quality detector is connected with the turbidity detector. The turbidity detector is connected with the pre-filter, and the pre-filter is connected with the self-cleaning water quality detector. The monitor can automatically complete calibration of the sensor in the water quality monitoring process, and also can regularly extract a swimming pool water sample and detect the water quality of the water sample; the monitor is also provided with a pre-filter, and the filter can filter particulate matters in the water sample in advance.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, and specifically to a water quality monitoring instrument capable of automatically calibrating sensors. Background Technology

[0002] As public spaces for leisure, entertainment, and fitness, swimming pool water quality is directly related to the health of users. Substandard levels of residual chlorine, pH, and turbidity can easily breed bacteria and viruses, causing skin allergies and eye infections; excessive urea indicates that the pool water is not changed in a timely manner. However, unlike drinking water and industrial water, swimming pool water quality monitoring does not require absolutely precise test data. The core requirement is long-term stable operation under relatively accurate conditions to reduce manual maintenance costs.

[0003] The current general-purpose water quality monitoring instrument has obvious defects when applied to swimming pools: (1) The sensor probe is prone to adsorbing pollutants in the water sample (such as hair and small particles), which leads to data distortion. Frequent manual disassembly and cleaning are required, resulting in high maintenance costs; (2) Fluctuations in the water sample flow rate (such as pool water replenishment and circulation pump start-up and shutdown) will interfere with the detection results and affect the stability of the data; (3) After the sensor performance drifts, it depends on manual calibration. If there is no manual calibration, the data will be distorted and lose the monitoring significance. In addition, frequent disassembly further reduces the durability of the probe.

[0004] The aforementioned problems make it difficult for traditional instruments to meet the requirements of "low maintenance and stable operation" in swimming pools. Therefore, there is an urgent need for a monitoring device that is optimized for swimming pool conditions and takes into account stability, durability and maintenance-free operation. Summary of the Invention

[0005] To address this, the present invention provides a water quality monitor capable of automatically calibrating sensors. This monitor is designed for the specific conditions of swimming pool water quality monitoring, which requires long-term stability and maintenance-free operation, even though absolute accuracy is not always necessary. It solves the problems of traditional general-purpose water quality monitors, such as large flow velocity interference, easy probe contamination, and frequent manual maintenance. Through a collaborative design of "timed and speed detection + deep self-cleaning + online automatic calibration", the device improves the detection stability and probe durability under normal accuracy conditions, ultimately achieving maintenance-free operation in swimming pool scenarios.

[0006] To achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution: A water quality monitor capable of automatically calibrating sensors, including The water source intake pump is used to draw water samples from the source to be tested or standard water samples, and pump the drawn water samples into the internal circulation water supply tank for the internal circulation detection and calibration system to perform self-test calibration or water sample testing. The drawn water samples are also pumped into the pre-filter to backwash the pre-filter. The internal circulation water supply tank is used to temporarily store water samples from the source water pump that are to be tested or standard water samples. An internal circulation detection and calibration system is used to detect the water quality of a water sample to be tested and to automatically calibrate the internal circulation based on the water quality data of a standard water sample. The internal circulation detection and calibration system includes an internal circulation water pump, a turbidity detector, a pre-filter, and a self-cleaning water quality detector. The internal circulation water pump provides the head pressure for the internal circulation detection and automatic calibration system, and draws the water sample to be tested or the standard water sample from the internal circulation water supply tank and pumps it into the turbidity detector. A turbidity detector is used to detect the turbidity value of a water sample. A pre-filter, located at the front end of the self-cleaning water quality monitor, can filter water samples entering the self-cleaning water quality monitor; The self-cleaning water quality detector is used to detect the pH value, residual chlorine value and oxidation-reduction potential value of water samples. It can automatically clean each detection sensor. After detection, the water sample is returned to the internal circulation water supply tank to form a circulation detection loop or discharged into the water source to be tested to complete the test. The display and input module is used to display the data of the test items detected in the water sample, as well as input the timing data and threshold data; The network control module is used to acquire standard data of the test items of the standard water source sample through the network and automatically calibrate each sensor in the test standard water source sample based on this data, drive the water source intake pump to take samples, drive the internal circulation pump to circulate the water sample, drive the turbidity detector and self-cleaning water quality monitor to test the water sample, output display information to the display and input module, and drive the water source intake pump to backwash the pre-filter. The power conversion module provides operating voltage for the water source pump, internal circulation pump, turbidity detector, self-cleaning water quality detector, display and input module, and network control module; The water source intake pump is connected to the internal circulation water supply tank and the pre-filter respectively. The internal circulation water supply tank is connected to the internal circulation water pump of the internal circulation detection and calibration system. The internal circulation water pump is connected to the turbidity detector. The turbidity detector is connected to the pre-filter. The pre-filter is connected to the self-cleaning water quality detector. The self-cleaning water quality detector is connected to the internal circulation water supply tank and the water source tank to be tested respectively. The water source intake pump, the internal circulation water pump, the turbidity detector, the self-cleaning water quality detector, the display and input module, and the network control module are all connected to the power conversion module. The water source intake pump, the internal circulation water pump, the turbidity detector, the self-cleaning water quality detector, and the display and input module are all connected to the network control module.

[0007] Furthermore, the water quality monitor capable of automatically calibrating sensors also includes a monitoring box. The water source pump, internal circulation water supply tank, internal circulation water pump, turbidity detector, self-cleaning water quality detector, network control module, and power conversion module are all fixed inside the monitoring box. The display and input module, including a touch screen, is fixed to the outer wall of the monitoring box door. A sampling tube is connected to the inlet connector of the water source pump, and a first tee is connected to the sampling tube. A standard water source sample sampling tube is connected to the first tee. The water sample collection tubes for the test water source and the standard water source are each equipped with a first solenoid valve and a second solenoid valve. A second three-way valve is connected to the outlet connector of the water source pump. The second three-way valve is connected to the internal circulation water supply tank via a water injection pipe and to the pre-filter via a backwash pipe. A third solenoid valve and a fourth solenoid valve are respectively installed on the water injection pipe and the backwash pipe. The inlet connector of the internal circulation water pump is connected to the internal circulation water supply tank via a conduit, and the outlet connector of the internal circulation water pump is connected to... A conduit is connected to the inlet of a turbidity detector, and the outlet of the turbidity detector is connected to a pre-filter via a conduit. A fifth solenoid valve is installed on the conduit connecting the turbidity detector and the pre-filter. A third three-way valve is fixed to the top of the pre-filter, and a fourth three-way valve is fixed to the bottom of the pre-filter. A drain pipe is also connected to the third three-way valve, extending from the bottom of the monitoring box. A sixth solenoid valve is installed on the drain pipe. The fourth three-way valve is connected to a self-cleaning water quality detector via a conduit, and a seventh solenoid valve is installed on the connected conduit. A fifth three-way valve is connected to the outlet of the self-cleaning water quality detector. A return pipe is connected to the fifth three-way valve and is connected to a circulating water supply tank. An eighth solenoid valve is installed on the return pipe. A drain branch pipe is also connected to the fifth three-way valve and is connected to the drain pipe. A ninth solenoid valve is installed on the drain branch pipe. All solenoid valves from the first to the ninth solenoid valve are connected to a network control module via relays. The water source pump and the internal circulating water pump are also connected to the network control module via relays.

[0008] Furthermore, the pre-filter includes a filter housing cover and a filter housing. The filter housing cover is threaded to the top of the filter housing. A filter element is inserted into the filter housing. The filter element has an insertion opening. The filter element includes a filter element encapsulation cylinder and a cylindrical filter element. The filter element encapsulation cylinder has several vertically distributed strip-shaped perforated liquid inlet holes.

[0009] Furthermore, the turbidity detector includes a turbidity detection water sample flow tank and a turbidity sensor. The turbidity sensor is inserted into the top of the turbidity detection water sample flow tank. The self-cleaning water quality detector includes a water quality detection water sample flow tank, a pH sensor, a residual chlorine sensor, an ORP sensor, and an ultrasonic vibration cleaning rod. The pH sensor, residual chlorine sensor, ORP sensor, and ultrasonic vibration cleaning rod are inserted into the water quality detection water sample flow tank, and a sealing gasket is provided at the insertion interface. A water sample inlet connector is provided on the left side of the water quality detection water sample flow tank, and a water sample outlet connector is provided on the right side.

[0010] The beneficial effects of this invention are as follows: 1. Improved detection stability: The internal circulating water pump enables constant-speed delivery of water samples, eliminating interference from fluctuations in pool water flow rate and differences in pipe diameter on the test results; it also supports timed repeated testing, and by calculating the average value of multiple cyclic tests, it further reduces random errors and ensures the stability of data under normal accuracy requirements, adapting to the non-absolutely precise monitoring needs of swimming pools.

[0011] 2. Extend probe durability: After each test, a deep self-cleaning process of "standard water sample internal circulation flushing + ultrasonic vibration cleaning" is initiated to prevent contaminants (such as hair, algae, and chloride residues) from being adsorbed on the sensor probe surface for a long time; combined with the primary filtration of the pre-filter and automatic backwashing, probe contamination is reduced from the source, significantly extending the probe's service life and reducing replacement costs.

[0012] 3. Achieve maintenance-free operation: Timed sampling and constant-speed testing eliminate the need for manual start-up and shutdown; deep self-cleaning replaces manual disassembly and cleaning; automatic backwashing of the pre-filter eliminates the need for filter cartridge replacement; online automatic calibration eliminates the need to stop the machine to remove sensors, avoiding manual intervention. The fully automated design completely eliminates equipment maintenance, significantly reducing the operation and maintenance costs for pool managers.

[0013] 4. Adapted to pool-specific working conditions: Instead of pursuing absolutely precise detection accuracy, it accurately matches the long-term, low-intervention water quality monitoring needs of pools through the core advantages of "stability + durability + maintenance-free", solving the adaptation pain points of traditional general-purpose instruments such as "complex maintenance and poor stability". Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural block diagram of a water quality monitor capable of automatically calibrating sensors; Figure 2 This is an internal structure diagram of a water quality monitor that can automatically calibrate sensors; Figure 3 This is a structural diagram of a water quality monitor capable of automatically calibrating sensors; Figure 4 This is a schematic cross-sectional view of the pre-filter. Figure 5 This is a schematic diagram of the filtration status of the pre-filter; Figure 6 This is a schematic diagram of the backwashing state of the pre-filter; Figure 7 This is a schematic cross-sectional view of the self-cleaning water quality detector.

[0016] In the attached diagram, the component names corresponding to each number are as follows: 1-Water source intake pump, 2-Internal circulation water supply tank, 3-Internal circulation water pump, 4-Turbidity detector, 5-Pre-filter, 6-Self-cleaning water quality detector, 7-Power conversion module, 8-Network control module, 9-Display and input module, 10-First tee, 11-Second tee, 12-Third tee, 13-Fourth tee, 14-Fifth tee, 15-First solenoid valve, 16-Second solenoid valve, 17-Third solenoid valve, 18-Fourth solenoid valve, 19-Fifth solenoid valve, 20-Sixth solenoid valve, 2 1-Seventh solenoid valve, 22-Eighth solenoid valve, 23-Ninth solenoid valve, 61-Water quality testing sample flow tank, 62-pH sensor, 63-Residual chlorine sensor, 64-ORP sensor, 65-Ultrasonic vibration cleaning rod, 81-Relay, 501-Filter housing, 502-Filter housing cover, 503-Filter element, 504-Connector, 505-Cylindrical filter element, 506-Inlet hole, 611-Detection tank, 612-Sealing gasket, 613-Water sample inlet connector, 614-Water sample outlet connector. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a water quality monitor capable of automatically calibrating sensors includes... Water source pump 1 has three functions: (1) pumping pool water samples to be tested according to the set cycle (timed sampling); (2) pumping standard water source samples (for automatic calibration and deep self-cleaning); (3) pumping standard water source samples into the pre-filter for backwashing. The sampling cycle can be set through the display and input module, and it will start automatically when the time expires without manual intervention.

[0019] The internal circulation water supply tank 2 temporarily stores water samples to be tested or standard water samples, providing a stable water sample reserve for internal circulation constant speed testing and self-cleaning flushing, avoiding testing interruptions caused by insufficient sampling volume in a single session; The internal circulation detection and calibration system, designed to achieve "timed and speed-controlled detection + deep self-cleaning + online automatic calibration," includes an internal circulation water pump, a turbidity detector, a pre-filter, and a self-cleaning water quality detector. The functions of each component are optimized as follows: The internal circulation water pump 3 not only provides water head pressure to the system, but more importantly, it enables constant-speed delivery of water samples: during the process of pumping the water sample to be tested or the standard water sample from the internal circulation water supply tank into the turbidity detector, stable pump speed control eliminates the interference of pool water flow rate fluctuations and pipe diameter differences on sensor detection, ensuring consistent testing conditions each time and improving data stability. Turbidity detector 4 detects the turbidity value of water samples, which is suitable for the routine monitoring needs of swimming pool turbidity. During the detection process, the water sample flow rate is controlled by the internal circulation water pump at a constant speed, resulting in higher data repeatability. The pre-filter 5 is located at the front end of the self-cleaning water quality detector to filter hair and large particulate impurities in the water sample, reducing primary pollution; it also supports backwashing (the water source pump pumps in standard water sample for flushing), to avoid filter clogging and eliminate the need for manual filter replacement. The self-cleaning water quality detector 6 has the following functions: (1) Core detection function: detects the pH value, residual chlorine value and oxidation-reduction potential value of water sample, and is adapted to the core water quality indicators of swimming pool; (2) Deep self-cleaning function: after each test, the self-cleaning process is automatically triggered - the water source pump draws the standard water source sample and transports it to the water quality test sample flow tank through the internal circulation loop to circulate and rinse the pH sensor, residual chlorine sensor and ORP sensor; at the same time, the network control module drives the ultrasonic vibration cleaning rod to work, shake off the tiny pollutants (such as algae and residual chloride) adsorbed on the probe surface, and the rinsing wastewater is discharged through the drainage branch pipe without manual disassembly and cleaning; (3) Circulation detection function: the water sample after detection can be returned to the internal circulation water supply tank to form a circulation loop (suitable for constant speed repeated detection, improving data stability), or directly discharged into the swimming pool to complete a single test; The display and input module 9, in addition to displaying test data, supports setting timed parameters (such as sampling and testing 3 times a day) and setting test thresholds (such as prompting for excessive residual chlorine). The operation interface is adapted to the simplified needs of pool managers and requires no professional skills. The network control module 8, as the core control unit of the system, realizes multi-functional collaboration: Timed control: Drives the water source pump to sample and the internal circulation pump to deliver water at a constant speed according to a set cycle to complete timed and speed detection; Self-cleaning control: Automatically triggers the "standard water sample internal circulation flushing + ultrasonic cleaning" process after detection; Automatic calibration control: Obtains standard water source data corresponding to the pool water quality (such as municipal tap water standard value) through the network, drives the system to extract standard water samples, and completes the online calibration of each sensor through the internal circulation loop without stopping the machine for disassembly; Backwash control: Periodically drives the water source pump to pump in standard water samples to backwash the pre-filter to avoid clogging.

[0020] Power conversion module 7 provides a stable operating voltage for all components, adapting to the 220V AC mains power supply at the swimming pool site, ensuring long-term continuous operation of the equipment. The water source intake pump is connected to the internal circulation water supply tank and the pre-filter respectively (to achieve sampling and backwashing respectively); the internal circulation water supply tank is connected to the internal circulation water pump (to provide stable water samples for constant-speed detection); the internal circulation water pump is connected to the turbidity detector (to deliver water samples at a constant speed); the turbidity detector is connected to the pre-filter (primary filtration); the pre-filter is connected to the self-cleaning water quality detector (for post-filtration detection); the self-cleaning water quality detector is connected to the internal circulation water supply tank (for circulation detection) and the swimming pool (for wastewater discharge).

[0021] like Figure 2-3As shown, the water quality monitor capable of automatically calibrating sensors also includes a monitoring box. The water source pump, internal circulation water supply tank, internal circulation water pump, turbidity detector, self-cleaning water quality detector, network control module, and power conversion module are all fixed inside the monitoring box. The display and input module, including a touch screen, is fixed to the outer wall of the monitoring box door. A sampling tube is connected to the inlet connector of the water source pump, and a first tee 10 is connected to the sampling tube. A standard water source sample sampling tube is connected to the first tee. The water sample collection tubes for the test water source and the standard water source are each equipped with a first solenoid valve and a second solenoid valve. A second three-way valve is connected to the outlet connector of the water source pump. The second three-way valve is connected to the internal circulation water supply tank via a water injection pipe and to the pre-filter via a backwash pipe. A third solenoid valve and a fourth solenoid valve are respectively installed on the water injection pipe and the backwash pipe. The inlet connector of the internal circulation water pump is connected to the internal circulation water supply tank via a conduit, and the outlet connector of the internal circulation water pump is connected to... A conduit is connected to the inlet of a turbidity detector, and the outlet of the turbidity detector is connected to a pre-filter via a conduit. A fifth solenoid valve is installed on the conduit connecting the turbidity detector and the pre-filter. A third three-way valve is fixed to the top of the pre-filter, and a fourth three-way valve is fixed to the bottom of the pre-filter. A drain pipe is also connected to the third three-way valve, extending from the bottom of the monitoring box. A sixth solenoid valve is installed on the drain pipe. The fourth three-way valve is connected to a self-cleaning water quality detector via a conduit, and a seventh solenoid valve is installed on the connected conduit. A fifth three-way valve is connected to the outlet of the self-cleaning water quality detector. A return pipe is connected to the fifth three-way valve and is connected to a circulating water supply tank. An eighth solenoid valve is installed on the return pipe. A drain branch pipe is also connected to the fifth three-way valve and is connected to the drain pipe. A ninth solenoid valve is installed on the drain branch pipe. All solenoid valves from the first to the ninth solenoid valve are connected to a network control module via relays. The water source pump and the internal circulating water pump are also connected to the network control module via relays.

[0022] like Figure 4-6 As shown, the pre-filter 2 includes a filter housing cover 502 and a filter housing 501. The filter housing cover is threaded to the top of the filter housing. A filter element 503 is inserted into the filter housing. The filter element has an open connector 504. The filter element includes a filter element encapsulation cylinder and a cylindrical filter element 505. The filter element encapsulation cylinder has several vertically distributed strip-shaped hollow liquid inlet holes 506.

[0023] like Figure 7As shown, the turbidity detector includes a turbidity detection water sample flow tank and a turbidity sensor. The turbidity sensor is inserted into the top of the turbidity detection water sample flow tank. The self-cleaning water quality detector 6 includes a water quality detection water sample flow tank 61, a pH sensor 62, a residual chlorine sensor 63, an ORP sensor 64, and an ultrasonic vibration cleaning rod 65. The pH sensor, residual chlorine sensor, ORP sensor, and ultrasonic vibration cleaning rod are inserted into the detection tank 611, and a sealing gasket 612 is provided at the insertion interface. A water sample inlet connector 613 is provided on the left side of the water quality detection water sample flow tank, and a water sample outlet connector 614 is provided on the right side.

[0024] In this embodiment, the power conversion module can convert 220V voltage into 5V operating voltage to provide standard voltage for the water pump, network control module, turbidity detector, self-cleaning water quality detector and relay; the first to ninth solenoid valves are normally closed solenoid valves selected through relays.

[0025] One specific application of this device is: (I) Timed and Speed-Based Testing Procedure 1. Set the timing parameters through the display and input module (e.g., test once each at 8:00, 14:00, and 20:00 daily); 2. After the set time is reached, the network control module drives the second solenoid valve (water source to be tested) and the third solenoid valve (water injection pipe) to open, and the water source pump draws the water sample to be tested from the pool and pumps it into the internal circulation water supply tank; 2. The internal circulation water pump starts and draws water samples from the internal circulation water supply tank at a fixed speed (e.g., 0.5L / min), and delivers them at a constant speed to the turbidity detector, pre-filter, and self-cleaning water quality detector; 3. After each sensor completes one detection, the water sample is returned to the internal circulation water supply tank, and the detection is repeated 3 times (the number of cycles can be set through the display and input module). 5. The network control module calculates the average value of the three tests and transmits it to the display module for display. The wastewater from the tests is then discharged into the swimming pool through the drainage branch pipe, and the process ends.

[0026] (II) Deep self-cleaning process 1. Backwashing of the pre-filter: The network control module drives the water source pump to draw standard water samples. At the same time, the network control module drives the fourth solenoid valve 18 and the sixth solenoid valve 20 to open via relays. The backwash water is directly pumped into the pre-filter by the water source pump 1. The backwash water enters the filter housing 501 through the bottom opening. Under water pressure, the backwash water enters the cylindrical filter element 505 through the strip-shaped hollow liquid inlet hole 506. Subsequently, the small particles and oily substances remaining on the inner wall of the cylindrical filter element 505 will enter the third tee through the connector 504. Since the fifth solenoid valve 19 is closed and the sixth solenoid valve 20 is open, the flushing wastewater will be discharged from the drain pipe, thus completing the backwashing of the pre-filter.

[0027] 2. After the timed and speed-controlled test is completed, the network control module closes the second solenoid valve (the water source to be tested) and opens the first solenoid valve (the standard water source) and the third solenoid valve (the water injection pipe). 3. The water source pump draws up a standard water sample (such as municipal tap water) and pumps it into the internal circulation water supply tank; 4. The internal circulation water pump starts and delivers the standard water sample at a constant speed to the flow tank of the self-cleaning water quality detector to circulate and rinse the pH, residual chlorine, and ORP sensors; at the same time, the network control module drives the ultrasonic vibration cleaning rod to work (frequency such as 40kHz) for 2 minutes. 5. After rinsing is complete, open the ninth solenoid valve (drain branch pipe) to discharge the rinsing wastewater containing contaminants; close the first solenoid valve and the internal circulating water pump to end the self-cleaning process. (III) Online Automatic Calibration Process 1. Set the calibration cycle (e.g., once a month, which can be adjusted via the display module). Once the cycle is reached, the network control module obtains the standard water source's index data (e.g., municipal tap water turbidity ≤ 0.1 NTU, pH 8.3, residual chlorine 0.2 mg / L) via the network. 2. Drive the first solenoid valve (standard water source) and the third solenoid valve (water injection pipe) to open, and the water source pump draws the standard water sample into the internal circulation water supply tank; 3. The internal circulation water pump starts and delivers standard water samples to each detector at a constant speed, collecting the test values ​​of turbidity, pH, residual chlorine, and ORP; 4. The network control module compares the collected values ​​with the standard values: if the error is within the allowable range (e.g., ±5%), no calibration is required; if the error exceeds the range, the sensor's output parameters are automatically adjusted (e.g., the pH sensor's offset is corrected) to complete the calibration. 5. After calibration, the standard water sample is discharged through the drainage branch pipe, and the equipment returns to normal monitoring status. The sensor does not need to be disassembled throughout the process, and there is no monitoring gap period.

[0028] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A water quality monitor capable of automatically calibrating sensors, characterized in that, include The water source intake pump is used to draw water samples from the source to be tested or standard water samples, and pump the drawn water samples into the internal circulation water supply tank for the internal circulation detection and calibration system to perform self-test calibration or water sample testing. The drawn water samples are also pumped into the pre-filter to backwash the pre-filter. The internal circulation water supply tank is used to temporarily store water samples or standard water samples drawn by the water source pump. An internal circulation detection and calibration system is used to detect the water quality of a water sample to be tested and to automatically calibrate the internal circulation based on the water quality data of a standard water sample. The internal circulation detection and calibration system includes an internal circulation water pump, a turbidity detector, a pre-filter, and a self-cleaning water quality detector. The internal circulation water pump provides the head pressure for the internal circulation detection and automatic calibration system, and draws the water sample to be tested or the standard water sample from the internal circulation water supply tank and pumps it into the turbidity detector. A turbidity detector is used to detect the turbidity value of a water sample. A pre-filter, installed at the front end of the self-cleaning water quality monitor, can filter water samples entering the self-cleaning water quality monitor; The self-cleaning water quality detector is used to detect the pH value, residual chlorine value and oxidation-reduction potential value of water samples. It can automatically clean each detection sensor. After detection, the water sample is returned to the internal circulation water supply tank to form a circulation detection loop or discharged into the water source to be tested to complete the test. The display and input module is used to display the data of the test items detected in the water sample, as well as input the timing data and threshold data; The network control module is used to acquire standard data of the test items of the standard water source sample through the network and automatically calibrate each sensor in the test standard water source sample based on this data, drive the water source intake pump to take samples, drive the internal circulation pump to circulate the water sample, drive the turbidity detector and self-cleaning water quality monitor to test the water sample, output display information to the display and input module, and drive the water source intake pump to backwash the pre-filter. The power conversion module provides operating voltage for the water source pump, internal circulation pump, turbidity detector, self-cleaning water quality detector, display and input module, and network control module; The water source intake pump is connected to the internal circulation water supply tank and the pre-filter respectively. The internal circulation water supply tank is connected to the internal circulation water pump of the internal circulation detection and calibration system. The internal circulation water pump is connected to the turbidity detector. The turbidity detector is connected to the pre-filter. The pre-filter is connected to the self-cleaning water quality detector. The self-cleaning water quality detector is connected to the internal circulation water supply tank and the water source tank to be tested respectively. The water source intake pump, the internal circulation water pump, the turbidity detector, the self-cleaning water quality detector, the display and input module, and the network control module are all connected to the power conversion module. The water source intake pump, the internal circulation water pump, the turbidity detector, the self-cleaning water quality detector, and the display and input module are all connected to the network control module.

2. A water quality monitor capable of automatically calibrating sensors according to claim 1, characterized in that, The water quality monitor capable of automatically calibrating sensors also includes a monitoring box. The water source pump, internal circulation water supply tank, internal circulation water pump, turbidity detector, self-cleaning water quality detector, network control module, and power conversion module are all fixed inside the monitoring box. The display and input module, including a touch screen, is fixed to the outer wall of the monitoring box door. A sampling tube is connected to the inlet connector of the water source pump, and a first three-way connector is connected to the sampling tube. A standard water source sample sampling tube and the water sample to be tested are connected to the first three-way connector. The source water sampling tube, standard source water sampling tube, and test source water sampling tube are each equipped with a first solenoid valve and a second solenoid valve. A second tee is connected to the outlet connector of the source water pump. The second tee is connected to the internal circulation water supply tank via a water injection pipe and to the pre-filter via a backwash pipe. A third solenoid valve and a fourth solenoid valve are respectively installed on the water injection pipe and the backwash pipe. The inlet connector of the internal circulation water pump is connected to the internal circulation water supply tank via a conduit, and the outlet connector of the internal circulation water pump is connected to... The inlet of the turbidity detector is connected to the outlet of the turbidity detector, which is connected to the pre-filter via a conduit. A fifth solenoid valve is installed on the conduit connecting the turbidity detector and the pre-filter. A third three-way valve is fixed to the top of the pre-filter, and a fourth three-way valve is fixed to the bottom of the pre-filter. A drain pipe is also connected to the third three-way valve, which extends from the bottom of the monitoring box. A sixth solenoid valve is installed on the drain pipe. The fourth three-way valve is connected to a self-cleaning water quality detector via a conduit, and a seventh solenoid valve is installed on the connected conduit. A fifth three-way valve is connected to the outlet of the self-cleaning water quality detector. A return pipe is connected to the fifth three-way valve and is connected to the circulating water supply tank. An eighth solenoid valve is installed on the return pipe. A drain branch pipe is also connected to the fifth three-way valve and is connected to the drain pipe. A ninth solenoid valve is installed on the drain branch pipe. All solenoid valves from the first to the ninth solenoid valve are connected to the network control module via relays. The water source pump and the internal circulation pump are also connected to the network control module via relays.

3. A water quality monitor capable of automatically calibrating sensors according to claim 2, characterized in that, The pre-filter includes a filter housing cover and a filter housing. The filter housing cover is threaded to the top of the filter housing. A filter element is inserted into the filter housing. The filter element has an insertion opening. The filter element includes a filter element encapsulation cylinder and a cylindrical filter element. The filter element encapsulation cylinder has several vertically distributed strip-shaped hollow liquid inlet holes.

4. A water quality monitor capable of automatically calibrating sensors according to claim 3, characterized in that, The turbidity detector includes a turbidity detection water sample flow tank and a turbidity sensor. The turbidity sensor is inserted into the top of the turbidity detection water sample flow tank. The self-cleaning water quality detector includes a water quality detection water sample flow tank, a pH sensor, an ORP sensor, a residual chlorine sensor, and an ultrasonic vibration cleaning rod. The pH sensor, ORP sensor, residual chlorine sensor, and ultrasonic vibration cleaning rod are inserted into the water quality detection water sample flow tank, and a sealing gasket is provided at the insertion interface. A water sample inlet connector is provided on the left side of the water quality detection water sample flow tank, and a water sample outlet connector is provided on the right side.

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