Fluid driven sensor self-cleaning device and method with switchable cleaning cavity

Abstract

The application discloses a fluid-driven sensor self-cleaning device and method with a switchable cleaning cavity, which comprises a cleaning sleeve sleeved on the periphery of a sensor probe body, the cleaning sleeve is limited by a mounting bracket and can move up and down along the periphery of the sensor probe body, a flow guide base is further arranged below the sensor probe body, the flow guide base is in close cooperation with the cleaning sleeve when the cleaning sleeve moves down to the lowest point and forms an annular switchable cleaning cavity, a flushing nozzle structure is arranged on the top surface of the flow guide base, and the input end of the flushing nozzle structure is connected with the bottom of a water inlet pipe through a water outlet pipe; when the cleaning sleeve moves down to the lowest point, the height of the top of the cleaning sleeve is higher than the liquid level in the pool; the application avoids the defects of high energy consumption and the need for additional power equipment in the traditional automatic cleaning scheme, and greatly reduces the operation energy consumption and equipment investment cost.

Description

Technical Field

[0001] This invention relates to the field of fishway technology, and in particular to a fluid-driven sensor self-cleaning device and method with a switchable cleaning chamber. Background Technology

[0002] In wastewater treatment plants, online sensors for dissolved oxygen, pH, ORP, turbidity, and ammonia nitrogen are often installed vertically downwards or tilted and submerged in biological treatment tanks, anoxic tanks, sludge return channels, and effluent monitoring channels. These sensors operate in environments with high suspended solids, high biological activity, and high pollution loads, leading to the following prominent problems during use: 1. Probe is easily contaminated and measurement stability is poor: Activated sludge, colloidal particles, biofilm and fibrous impurities are very easy to adhere to the probe measurement surface, resulting in delayed measurement response, numerical drift or abnormal alarm, affecting the accuracy and reliability of online monitoring data.

[0003] 2. Manual cleaning and maintenance is costly and inefficient: Existing cleaning methods mostly rely on manual periodic wiping, which is not only labor-intensive and requires frequent maintenance, but also suffers from drawbacks such as delayed cleaning, high maintenance costs, and difficulty in adapting to large-scale decentralized deployment.

[0004] 3. Existing automatic cleaning solutions are complex: Existing automatic cleaning technologies mostly use compressed air blowing, water pump rinsing, motor brushing, or external actuators, which require additional power equipment. This results in problems such as high external energy consumption, complex system structure, many failure points, high operation and maintenance costs, and is not conducive to large-scale promotion and application.

[0005] 4. Fixed antifouling structures have limited effectiveness: Although some fixed antifouling structures can slow down the adhesion of pollutants to a certain extent, they cannot actively remove the already attached sludge and biofilm, resulting in poor long-term antifouling effect and difficulty in meeting the requirements for long-term stable operation.

[0006] In summary, existing sensor cleaning technologies are insufficient to meet core requirements such as in-situ automatic cleaning, uninterrupted monitoring, and simple and easy-to-promote structure. There is an urgent need for a device and method that is simple in structure, can switch between monitoring and cleaning modes, and can use the water body's own energy to complete in-situ self-cleaning. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a fluid-driven sensor self-cleaning device and method with a switchable cleaning chamber to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A fluid-driven self-cleaning device for sensors with a switchable cleaning chamber includes a cleaning sleeve fitted around the periphery of a sensor probe body. The cleaning sleeve is limited by a mounting bracket and can move up and down axially along the periphery of the sensor probe body. A flow guide base is also provided below the sensor probe body. When the cleaning sleeve is lowered to its lowest point, the flow guide base is sealed to it, forming an annular switchable cleaning chamber. The top surface of the flow guide base is provided with a flushing nozzle structure. The input end of the flushing nozzle structure is connected to the bottom of the inlet pipe through an outlet pipe. When the cleaning sleeve is lowered to its lowest point, the top height of the cleaning sleeve is higher than the liquid level in the tank.

[0009] Preferably, the sensor probe body is installed vertically downwards; the axially sliding cleaning sleeve is coaxially arranged around the sensor probe body, and the device is in normal monitoring mode when it is in the upward position and in self-cleaning mode when it is in the downward position.

[0010] Preferably, the flushing nozzle structure is located in the circumferential or adjacent area of ​​the probe measuring end; the bottom of the water inlet pipe is fixed to the flow guide base and connected to the input end of the flushing nozzle structure through one or more water outlet pipes.

[0011] Preferably, one side of the mounting bracket is installed on the pool wall, pool railing, or channel sidewall, and the other side is used to fix the sensor probe body and the flow guide base. The side of the mounting bracket is also equipped with a guide rail and a slider that slides with it. The surface of the slider is connected to the sidewall of the cleaning sleeve through a connector.

[0012] Preferably, the slider is driven to slide by human force and fixed in position by a tightening screw, or it is driven to slide by a telescopic mechanism.

[0013] Preferably, the sensor probe body is a fluorescence dissolved oxygen probe, an electrode dissolved oxygen probe, a pH probe, an ORP probe, a conductivity probe, a turbidity probe, an ammonia nitrogen probe, a liquid level sensor, or an underwater optical monitoring probe.

[0014] Preferably, the flushing nozzle structure adopts one of the following: annular slit nozzle, multi-hole array nozzle, tangential nozzle, spiral guide nozzle, multi-stage contraction nozzle, venturi acceleration nozzle, or pulse nozzle.

[0015] Preferably, the nozzle of the flushing nozzle structure adopts a tapered structure with a large-diameter inlet and a small-diameter outlet; the jet direction is one of tangential flushing along the probe surface, oblique downward sweeping, circumferential swirling, and pulse sweeping.

[0016] Preferably, there are multiple water inlet pipes, each with a flared opening at its top, the outer diameter of which is larger than the inner diameter.

[0017] In addition, the present invention also discloses a self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber, applied to the aforementioned self-cleaning device for a fluid-driven sensor with a switchable cleaning chamber, comprising the following steps: S1. Normal monitoring mode operation: The cleaning sleeve fitted around the sensor probe body moves upward along the outer axis of the sensor probe body to the monitoring position. The lower end of the cleaning sleeve separates from the guide base, and the measuring end of the sensor probe body is completely exposed in the water. The device does not cause significant disturbance to the surrounding water. S2. Self-cleaning mode switching: When cleaning is required, the cleaning sleeve moves axially downward along the outer periphery of the sensor probe body to the lowest point. The cleaning sleeve and the guide base are sealed together to form an annular switchable cleaning chamber. S3, Fluid-driven self-cleaning: Water enters the inlet pipe and is transported through the outlet pipe to the flushing nozzle structure on the top surface of the guide base. The water flow is accelerated and ejected through the flushing nozzle structure, forming a high-speed flushing flow on the surface of the sensor probe body, stripping off and carrying away contaminants from the probe surface. S4. Monitoring mode restoration: After cleaning is completed, move the cleaning sleeve upward along the outer periphery of the sensor probe body to the monitoring position, release the annular switchable cleaning chamber, and the device returns to normal monitoring status.

[0018] Furthermore, in step S3, the water body is continuously flowing into the inlet pipe by utilizing the water level difference, flow velocity difference, or water level fluctuation, thus forming a continuous driving flow channel.

[0019] Furthermore, when utilizing the water level difference, in the initial stage, when the cleaning sleeve moves down to its lowest point, the top height of the cleaning sleeve is higher than the water level in the pool, and the water level inside the cleaning sleeve is the same as the water level in the external pool. When the water level in the pool rises and exceeds the top height of the inlet pipe, there is a water level difference between the inside and outside of the cleaning sleeve, which allows the water to enter along the inlet pipe and be transported to the flushing nozzle structure on the top surface of the guide base through the outlet pipe. The water flow is accelerated and sprayed out through the flushing nozzle structure.

[0020] Furthermore, when using the existing velocity difference in the pool to create a local pressure difference to drive the water flow, the flared end of the inlet pipe is placed in a high velocity zone, the direction of the flow, or a high dynamic pressure zone, so that a higher total pressure is formed at the inlet and the outlet of the flushing nozzle structure is located in a relatively low pressure zone. A pressure difference driving force is formed between the inlet and the outlet. The water enters the inlet pipe through the flared end, passes through the bottom of the inlet pipe which is fixed on the guide base, and is transported to the flushing nozzle structure through multiple outlet pipes, pushing the water flow through the annular switchable cleaning chamber.

[0021] Furthermore, when instantaneous drive is generated by the fluctuation of the liquid level in the pool, a predetermined start-up liquid point is set in the inlet pipe. When the liquid level in the pool rises to the set position, water is quickly filled into the inlet pipe through the flared opening at the top of the inlet pipe. The water is then transported to the flushing nozzle structure through multiple outlet pipes after passing through the bottom of the inlet pipe, which is fixed on the guide base, and the cleaning flow is started. After the liquid level falls back, the drive flow automatically terminates, completing one cleaning process.

[0022] Beneficial effects of this invention: 1. This invention does not require external power equipment such as compressed air, water pumps, or motors. It relies entirely on the energy of the water itself (liquid level difference, flow velocity difference, and liquid level fluctuation) to drive the clean water flow, thus avoiding the drawbacks of traditional automatic cleaning solutions that have high energy consumption and require additional power equipment, and significantly reducing operating energy consumption and equipment investment costs.

[0023] 2. This invention allows for rapid switching between normal monitoring mode and self-cleaning mode by axially moving the cleaning sleeve; in monitoring mode, the probe measuring end is fully exposed, equivalent to the operating state of a bare probe, without changing the original installation method of the sensor, without interfering with normal data acquisition, and ensuring the continuity of online monitoring and measurement accuracy.

[0024] 3. This invention forms a directional flow channel through a closed annular cleaning chamber, combined with a tapered flushing nozzle structure, which can generate a high-speed flushing flow on the probe surface; at the same time, it is compatible with multiple jet directions such as tangential, circumferential, and pulsed, generating high shear force to effectively peel off attached activated sludge, biofilm, colloidal particles and fibrous impurities, thus solving the problems of numerical drift and response hysteresis caused by probe contamination.

[0025] 4. The device of the present invention has a simple overall structure, few core components, and no complex transmission or execution mechanism; the cleaning sleeve slides flexibly (driven by manual or telescopic mechanism), the components are easy to disassemble and maintain, there are few points of failure during operation, and the long-term operation is highly stable, which greatly reduces the workload and maintenance cost.

[0026] 5. This invention is compatible with various immersion online sensor probes such as fluorescent dissolved oxygen, pH, ORP, turbidity, and ammonia nitrogen, meeting the needs of different water quality monitoring scenarios; it is also compatible with three driving methods: liquid level difference, flow velocity difference, and liquid level fluctuation, and is suitable for various highly polluted water environments such as biological treatment tanks, return channels, and monitoring channels in sewage treatment plants, making it suitable for large-scale decentralized deployment and widespread application. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a fluid-driven sensor self-cleaning device with a switchable cleaning chamber. Figure 2 This is a schematic diagram of the application status of a fluid-driven sensor self-cleaning device with a switchable cleaning chamber in normal monitoring mode. Figure 3 This is a schematic diagram illustrating the application status of a fluid-driven sensor self-cleaning device with a switchable cleaning chamber in self-cleaning mode. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Example 1: This example is a fluid-driven sensor self-cleaning device with a switchable cleaning chamber, applied in the field of wastewater treatment online monitoring technology. It is suitable for immersion online sensor probes in scenarios such as biological treatment tanks, anoxic tanks, sludge return channels, and effluent monitoring channels in wastewater treatment plants. It is used to solve the problems of probes being in water bodies with high suspended solids, high biological activity, and high pollution load for a long time, which are prone to sludge and biofilm adhesion, leading to measurement drift, as well as the problems of existing cleaning methods relying on manual or external power, complex structure, and high maintenance costs.

[0030] like Figure 1 As shown, the device includes a sensor probe body 1, a cleaning sleeve 3, a mounting bracket 2, a flow guide base 4, a water inlet pipe 6, a water outlet pipe 7, and a flushing nozzle structure 8.

[0031] The sensor probe body 1 is installed vertically downwards and can be equipped with fluorescent dissolved oxygen probe, electrode dissolved oxygen probe, pH probe, ORP probe, conductivity probe, turbidity probe, ammonia nitrogen probe, liquid level sensor or underwater optical monitoring probe to meet different water quality monitoring needs.

[0032] The cleaning sleeve 3 is coaxially sleeved around the sensor probe body 1. It can move up and down along the outer axis of the sensor probe body 1 by being limited by the mounting bracket 2. When the cleaning sleeve 3 is in the upward position, the device is in normal monitoring mode. When it is moved down to the lowest point, the device is in self-cleaning mode. At this time, the top height of the cleaning sleeve 3 is higher than the liquid level in the pool, providing a structural basis for liquid level difference-driven cleaning.

[0033] Mounting bracket 2 is fixedly installed on one side of the pool wall, pool railing, or channel sidewall, and the other side is used to fix the sensor probe body 1 and the flow guide base 4. A guide rail 2.1 is mounted on the side of mounting bracket 2, and a slider 2.2 slides on the guide rail 2.1. The slider 2.2 is connected to the sidewall of the cleaning sleeve 3 via a connector, enabling axial movement of the cleaning sleeve 3. The slider 2.2 can be driven manually and fixed in position by through-hole tightening screws, or it can be driven by a telescopic mechanism to adapt to different operating scenarios. The telescopic mechanism can adopt a simple pneumatic or electric push rod structure.

[0034] The flow guide base 4 is located below the sensor probe body 1. When the cleaning sleeve 3 moves down to the lowest point, the flow guide base 4 and the lower end of the cleaning sleeve 3 are sealed together to form an annular switchable cleaning chamber 5. The top surface of the flow guide base 4 is provided with a flushing nozzle structure 8. The flushing nozzle structure 8 is located in the circumferential or adjacent area of ​​the probe measuring end. It can be one of the following: annular slit nozzle, multi-hole array nozzle, tangential nozzle, spiral flow guide nozzle, multi-stage contraction nozzle, Venturi acceleration nozzle, or pulse nozzle. The nozzle adopts a tapered structure with a large-diameter water inlet and a small-diameter water outlet. The jet direction is tangential flushing along the probe surface, oblique downward sweeping, annular swirling, or pulse sweeping to enhance the stripping effect of contaminants on the probe surface.

[0035] The bottom of the water inlet pipe 6 is fixed to the flow guide base 4. There are multiple water inlet pipes 6, and the top of the pipe is horizontally provided with a flared mouth. The outer diameter of the flared mouth is large and the inner diameter is small, which facilitates the efficient flow of water. The bottom of the water inlet pipe 6 is connected to the input end of the flushing nozzle structure 8 through one or more water outlet pipes 7, forming a complete fluid transport path.

[0036] This device achieves rapid switching between monitoring and self-cleaning modes by axially moving the cleaning sleeve 3. It utilizes the water body's own energy to drive the clean water flow, has a simple structure, is easy to maintain, does not affect the continuity and accuracy of online sensor monitoring, and is suitable for the large-scale decentralized deployment needs of sewage treatment plants.

[0037] Example 2: This example is a fluid-driven sensor self-cleaning method with a switchable cleaning chamber, applied to the fluid-driven sensor self-cleaning device described in the above device example. It utilizes the energy of the water itself to achieve in-situ self-cleaning of the sensor probe, avoiding the high cost of manual cleaning and the complex structural problems of external power cleaning, while not interfering with the normal online monitoring of the sensor.

[0038] The method specifically includes the following steps: S1. Normal monitoring mode operation: Move the cleaning sleeve 3, which is fitted around the sensor probe body 1, upward along the outer axial direction of the sensor probe body 1 to the monitoring position. At this time, the lower end of the cleaning sleeve 3 separates from the guide base 4, and the measuring end of the sensor probe body 1 is completely exposed to the water (e.g., Figure 2 As shown in the figure, the device does not cause significant disturbance to the surrounding water body, the sensor can collect water quality data normally, realize continuous online monitoring, and is equivalent to the operating state of the bare probe, without affecting the monitoring accuracy.

[0039] S2. Self-cleaning mode switching: When activated sludge, colloidal particles, biofilm or fibrous impurities adhere to the surface of the sensor probe body 1, resulting in measurement response lag and numerical drift, cleaning is required. At this time, the cleaning sleeve 3 is moved down along the outer periphery of the sensor probe body 1 to the lowest point. The lower end of the cleaning sleeve 3 is sealed with the flow guide base 4 to form a closed annular switchable cleaning chamber 5, providing a closed flow channel for fluid-driven cleaning.

[0040] S3. Fluid-driven self-cleaning: Water enters the inlet pipe 6 and is transported through the outlet pipe 7 to the flushing nozzle structure 8 on the top surface of the guide base 4. The water flow is accelerated and ejected through the flushing nozzle structure 8, forming a high-speed flushing flow on the surface of the sensor probe body 1, stripping away and carrying away contaminants from the probe surface. This step requires no external power and utilizes the water's own energy to form a continuous driving flow channel. Specifically, fluid drive can be achieved in three ways: Firstly, it utilizes the water level difference for driving: In the initial stage, when the cleaning sleeve 3 moves to its lowest point, its top height is higher than the water level in the pool, and the water level inside the cleaning sleeve 3 is consistent with the water level in the external pool; when the water level in the pool rises and exceeds the height of the top flared opening of the inlet pipe 6, a water level difference is formed inside and outside the cleaning sleeve 3 (e.g., Figure 3 As shown, water flows into the inlet pipe 6 through the flared mouth, and then through the bottom of the inlet pipe 6 which is fixed to the guide base 4. It is then transported to the flushing nozzle structure 8 through multiple outlet pipes 7, where the water is sprayed out at an accelerated speed to complete the cleaning.

[0041] Secondly, the existing velocity difference in the pool body is used to create a local pressure difference drive: the flared end of the inlet pipe 6 is set in the high velocity zone, the flow direction, or the high dynamic pressure zone in the pool, so that a higher total pressure is formed at the inlet of the flared end, while the outlet of the flushing nozzle structure 8 is located in a relatively low pressure zone, forming a pressure difference drive force between the inlet and the outlet; the water flows into the inlet pipe 6 through the flared end, and is transported to the flushing nozzle structure 8 through the outlet pipe 7, pushing the water flow through the annular switchable cleaning chamber 5 to achieve probe surface cleaning, adapting to the original flow patterns such as aeration upflow and push flow in the pool.

[0042] Third, instantaneous drive is generated by the fluctuation of the tank liquid level: a predetermined start-up liquid point is set on the inlet pipe 6. During the sewage treatment process, the liquid level in the tank will fluctuate periodically due to the influence of aeration intensity, inlet and outlet water flow, pump station start and stop. When the liquid level in the tank rises to the set start-up liquid point, water is quickly filled into the inlet pipe 6 through the flared opening at the top of the inlet pipe 6, and then transported to the flushing nozzle structure 8 through the outlet pipe 7 to start the cleaning flow. After the liquid level falls back, the drive flow automatically terminates, completing one cleaning process and realizing periodic automatic cleaning.

[0043] S4. Monitoring mode restoration: After cleaning is completed, the cleaning sleeve 3 is moved upward along the outer periphery of the sensor probe body 1 to the monitoring position, the annular switchable cleaning chamber 5 is released, the device returns to normal monitoring state, the measuring end of the sensor probe body 1 is exposed to the water again, and the online monitoring task continues to be performed. The cleaning process does not affect the continuity of monitoring.

[0044] This method achieves in-situ self-cleaning of the sensor probe solely through operating condition switching and the water's own energy. It provides stable cleaning results, is easy to operate, significantly reduces sensor maintenance costs in wastewater treatment plants, and is suitable for the long-term stable operation requirements of various submersible online sensors.

[0045] Example 3: A fluid-driven sensor self-cleaning device with a switchable cleaning chamber applied to the DO probe in the aerobic tank of a 100,000-ton / day wastewater treatment plant. This embodiment is applied to a municipal wastewater treatment plant with a daily treatment capacity of 100,000 tons, equipped with two sets of parallel biological treatment tanks (each set with a hydraulic load of 50,000 tons / day). The installation location is selected above the aeration zone in the middle of the aerobic section of the biological treatment tank. The bottom of this area is densely covered with microporous aeration discs, which, due to the air lift effect, form a strong bubble plume. The upward flow velocity in the core area is concentrated between 0.15 and 0.35 m / s, carrying water upwards and forming a significant surface surge wave on the liquid surface. The surge wave height (i.e., local static head rise) is approximately 60 mm (in actual engineering, the aeration surge wave height can often reach 200 mm; to verify the feasibility of the device under the most unfavorable conditions, we conservatively took 60 mm as the effective surge wave static head that the device can utilize). The goal is to provide an in-situ, non-powered self-cleaning method for the vertically downward-installed cylindrical DO probe (10 cm in cross-sectional diameter), requiring a flushing flow velocity of 0.6 to 1.0 m / s to generate sufficient shear force to peel off the activated sludge and biofilm attached to the probe surface.

[0046] II. Equipment Design Parameters Based on the above-mentioned aerobic tank operating conditions, the specific structural dimensions and installation parameters of the fluid-driven sensor self-cleaning device with a switchable cleaning chamber are designed as follows: 1. Installation and Arrangement: The device should be aligned above the core axis where the bottom aeration distribution is densest and the plume rises most strongly. The inlet of the water inlet channel should be precisely positioned above the calm water surface area and within the coverage area of ​​the surge wave crest to achieve natural "skimming" (gas-liquid separation) and capture maximum static pressure potential energy.

[0047] 2. Cleaning sleeve dimensions: The cleaning sleeve is designed as a cylinder coaxial with the DO probe, with an inner diameter of 18cm. The sleeve and the probe with an outer diameter of 10cm form an annular switchable cleaning chamber with a 4cm gap on one side.

[0048] 3. Water inlet pipe distribution: Four water inlet pipes are equidistantly arranged around the periphery of the cleaning sleeve. The physical area of ​​the water inlet end hole of a single water inlet pipe is 0.0056 m², and the total physical area of ​​the opening is 0.0224 m².

[0049] 4. Flushing nozzle structure: The nozzle is designed as a ring-shaped, gradually narrowing slit surrounding the bottom of the probe (large-diameter inlet, small-diameter outlet). To balance the high flow velocity acceleration effect with the ability to prevent impurities from clogging, the physical gap width of the nozzle is set at 10mm.

[0050] III. Self-cleaning flow rate verification calculation To verify whether the above parameter design can achieve the cleaning requirement of 0.6~1.0 m / s, a hydraulic check was performed based on the modified Bernoulli energy conservation equation for multiphase flow: Set target washing jet velocity v nozzle =0.8m / s, the designed flushing flow rate is 2.0L / s (i.e. 0.002m³ / s).

[0051] 1. The system effectively drives the water head (available potential energy): The driving head consists of the surging static head of the external environment and the rising fluid dynamic pressure.

[0052] Take the conservative surge height H swell =60mm, The upward flow velocity v plume =0.25m / s.

[0053] The dynamic pressure head is calculated as follows: (i.e., 3mm) The total effective driving head of the system is: 60mm + 3mm = 63mm.

[0054] 2. Total head loss of the system and conversion of nozzle kinetic energy (energy consumption): When fluid flows through a narrow-slit converging nozzle, the velocity coefficient C v Approximately 0.95. The effective dynamic head of the nozzle required to generate a jet velocity of 0.8 m / s is: (i.e., 36mm) Inlet flow velocity v in =0.089m / s, its local resistance head loss h in ≈0.2mm.

[0055] Flow velocity v in the annular main cavity cavity =0.114m / s, due to the wide flow channel and extremely low flow velocity, the frictional resistance loss along the flow path h f ≈0.2mm.

[0056] 3. Verification Conclusion: The total pressure drop within the device required to maintain the target flow rate is: ΔH nozzle +h in +h f =36mm + 0.2mm + 0.2mm = 36.4mm.

[0057] Calculations show that the total head consumption (36.4 mm) required to generate a high-speed 0.8 m / s flushing flow is far less than the conservative driving head (63 mm) provided by the aeration tank environment. In actual operation, the flow channel potential energy conversion redundancy reaches nearly 60%, and the nozzle outlet flow velocity can be stabilized between 0.8 and 1.0 m / s. This high-speed jet generates a tangential shear force greater than 1.28 Pa on the probe surface, fully verifying the technical feasibility of achieving thorough self-cleaning of the DO sensor surface without external power thanks to the flow channel and hydraulic design.

[0058] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A fluid-driven sensor self-cleaning device with a switchable cleaning chamber, comprising a cleaning sleeve (3) sleeved around the sensor probe body (1), characterized in that, The cleaning sleeve (3) is limited by the mounting bracket and can move up and down along the outer periphery of the sensor probe body (1). A flow guide base (4) is also provided below the sensor probe body (1). When the cleaning sleeve (3) moves down to the lowest point, the flow guide base (4) is sealed to form an annular switchable cleaning chamber (5). The top surface of the flow guide base (4) is provided with a flushing nozzle structure (8). The input end of the flushing nozzle structure (8) is connected to the bottom of the inlet pipe (6) through the outlet pipe (7). When the cleaning sleeve (3) moves down to the lowest point, the top height of the cleaning sleeve (3) is higher than the liquid level in the pool.

2. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The sensor probe body (1) is installed vertically downward; the axially sliding cleaning sleeve (3) is coaxially arranged around the sensor probe body (1). When the device is in the upward position, it is in the normal monitoring mode, and when the device is in the downward position, it is in the self-cleaning mode.

3. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The flushing nozzle structure (8) is located in the circumferential or adjacent area of ​​the probe measuring end; the bottom of the water inlet pipe (6) is fixed on the flow guide base (4) and connected to the input end of the flushing nozzle structure (8) through one or more water outlet pipes (7).

4. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The mounting bracket (2) is installed on one side of the pool wall, pool railing or channel side wall, and the other side is used to fix the sensor probe body (1) and the flow guide base (4). The mounting bracket (2) is also equipped with a guide rail (2.1) and a slider (2.2) that slides with it. The surface of the slider (2.2) is connected to the side wall of the cleaning sleeve (3) through a connector.

5. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The slider (2.2) can be driven to slide by human power and fixed in position by the tightening screw, or it can be driven to slide by a telescopic mechanism.

6. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The sensor probe body (1) is a fluorescence dissolved oxygen probe, an electrode dissolved oxygen probe, a pH probe, an ORP probe, a conductivity probe, a turbidity probe, an ammonia nitrogen probe, a liquid level sensor, or an underwater optical monitoring probe.

7. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The flushing nozzle structure (8) adopts one of the following: annular slit nozzle, multi-hole array nozzle, tangential nozzle, spiral guide nozzle, multi-stage contraction nozzle, venturi acceleration nozzle or pulse nozzle.

8. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The nozzle of the flushing nozzle structure (8) adopts a tapered structure with a large-diameter inlet and a small-diameter outlet; the jet direction is one of the following: tangential flushing along the probe surface, oblique downward sweeping, circumferential swirling, and pulse sweeping.

9. The fluid-driven sensor self-cleaning device with a switchable cleaning chamber according to claim 1, characterized in that, The number of water inlet pipes (6) is multiple, and a flared mouth is provided horizontally at the top of each pipe. The outer diameter of the flared mouth is large, and the inner diameter is small.

10. A self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber, applied to the self-cleaning device for a fluid-driven sensor with a switchable cleaning chamber as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Normal monitoring mode operation: The cleaning sleeve (3) fitted around the sensor probe body (1) moves upward along the outer axis of the sensor probe body (1) to the monitoring position. The lower end of the cleaning sleeve (3) separates from the guide base (4). The measuring end of the sensor probe body (1) is completely exposed in the water. The device does not cause significant disturbance to the surrounding water. S2, Self-cleaning mode switching: When cleaning is required, the cleaning sleeve (3) moves down along the outer periphery of the sensor probe body (1) to the lowest point, and the cleaning sleeve (3) and the guide base (4) are sealed together to form an annular switchable cleaning chamber (5). S3, fluid-driven self-cleaning: water enters the inlet pipe (6), and is transported through the outlet pipe (7) to the flushing nozzle structure (8) on the top surface of the guide base (4). The water flow is accelerated and sprayed out through the flushing nozzle structure (8), forming a high-speed flushing flow on the surface of the sensor probe body (1), stripping off and carrying away the contaminants on the probe surface. S4. Monitoring mode recovery: After cleaning is completed, move the cleaning sleeve (3) upward along the outer periphery of the sensor probe body (1) to the monitoring position, release the annular switchable cleaning chamber (5), and the device returns to normal monitoring status.

11. The self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber according to claim 10, characterized in that, In step S3, the water body is continuously flowing into the inlet pipe (6) by utilizing the difference in water level, flow velocity, or water level fluctuation, thus forming a continuous driving flow channel.

12. The self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber according to claim 11, characterized in that, When the water level difference is utilized, in the initial stage, when the cleaning sleeve (3) moves down to the lowest point, the top height of the cleaning sleeve (3) is higher than the water level in the pool. The water level inside the cleaning sleeve (3) is the same as the water level in the external pool. When the water level in the pool rises and exceeds the top height of the inlet pipe (6), there is a water level difference between the inside and outside of the cleaning sleeve (3), so that the water enters along the inlet pipe (6) and is transported to the flushing nozzle structure (8) on the top surface of the guide base (4) through the outlet pipe (7). The water flows through the flushing nozzle structure (8) and is accelerated and sprayed out.

13. The self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber according to claim 11, characterized in that, When the water flow is driven by the local pressure difference formed by the original flow velocity difference of the pool, the flared mouth at the top of the inlet pipe (6) is set in the high flow velocity zone, the flow direction or the high dynamic pressure zone, so that a higher total pressure is formed at the inlet and the outlet of the flushing nozzle structure (8) is located in the relatively low pressure zone, forming a pressure difference driving force between the inlet and the outlet. The water enters the inlet pipe (6) through the flared mouth, passes through the bottom of the inlet pipe (6) which is fixed on the guide base (4), and is transported to the flushing nozzle structure (8) through multiple outlet pipes (7), pushing the water flow through the annular switchable cleaning chamber (5).

14. The self-cleaning method for a fluid-driven sensor with a switchable cleaning chamber according to claim 11, characterized in that, When the instantaneous drive is generated by the fluctuation of the liquid level in the pool, the water inlet pipe (6) is set with a predetermined start-up liquid point. When the liquid level in the pool rises to the set position, the water is quickly filled into the water inlet pipe (6) through the flared opening at the top of the water inlet pipe (6). The water is then transported to the flushing nozzle structure (8) through multiple water outlet pipes (7) through the bottom of the water inlet pipe (6) which is fixed on the guide base (4) to start the cleaning flow. After the liquid level falls back, the drive flow automatically terminates, completing one cleaning process.

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