Aquaculture circulating water constant temperature control system and method based on microwave energy

Abstract

The invention relates to the technical field of aquaculture constant-temperature equipment, and discloses an aquaculture circulating water constant-temperature control system and method based on microwave energy, and the system comprises a base plate, and the center of the top surface of the base plate is fixedly provided with a culture barrel, a microwave generation module, a circulating water treatment unit, a temperature detection network, an intelligent control center and a safety protection system. The microwave generation module comprises a heat preservation box, a heat exchange tube, a resonance tube, a magnetron and a waveguide, the circulating water treatment unit comprises a rotary drum type filtering device, a water tank and a flow sensor, and the temperature detection network comprises a water quality monitoring probe, a multi-point distributed optical fiber temperature sensor, an intelligent control center touch control type man-machine interaction interface and a PLC. The safety protection system comprises a high-temperature alarm sensor, a resonant cavity pressure safety valve and a microwave leakage monitoring probe, a double-closed-loop control strategy is adopted, an inner ring is used for controlling microwave power, an outer ring is used for adjusting circulating flow, and the device can dynamically optimize a temperature curve according to breeding varieties and growth stages.

Description

Technical Field

[0001] This invention belongs to the technical field of constant temperature equipment for aquaculture, specifically, it relates to a constant temperature control system and method for circulating water in aquaculture based on microwave energy. Background Technology

[0002] Microwave-based aquaculture recirculating water temperature control system is a recirculating aquaculture device that uses microwave technology to achieve precise temperature control of water. Microwave heating technology has advantages such as internal heating, selective heating, and strong instantaneous heating, but its application in the field of aquaculture temperature control is still immature.

[0003] The prior art discloses a constant temperature control device for aquaculture ponds (CN218073098U), which includes an aquaculture pond body, a support plate fixedly connected to the upper surface of the aquaculture pond body, a water tank fixedly connected to the upper surface of the support plate, a cooler fixedly connected to the upper surface of the water tank, the cooling end of the cooler extending into the interior of the water tank, a heater fixedly connected to the right inner surface of the water tank, a drain pipe fixedly connected to the lower surface of the water tank, the drain pipe extending through the support plate and into the interior of the aquaculture pond body away from the lower surface of the water tank, and a solenoid valve fixedly connected to the surface of the drain pipe.

[0004] The research revealed several issues. First, existing technologies rely on heaters and other electrical appliances for circulating temperature control, resulting in low heat transfer efficiency, high energy consumption, and localized temperature differences. Second, existing technologies use single-point temperature sensors, failing to achieve dynamic monitoring of a three-dimensional temperature field. Third, existing technologies rely on an electrical control box in conjunction with the heater for temperature regulation, leading to significant heat loss and difficulty in achieving precise dynamic control. They cannot adjust temperature control parameters according to the growth stages of different aquaculture species, nor do they possess remote monitoring and fault alarm functions, requiring frequent manual intervention and increasing management costs. Finally, if microwave heating technology is integrated into existing technologies, there are no effective microwave leakage monitoring and protection measures, posing a microwave radiation safety hazard. Furthermore, the lack of emergency handling mechanisms for overload, high temperature, and other abnormal situations can easily lead to equipment damage or aquaculture accidents, resulting in limited practicality of the device.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A microwave-based aquaculture recirculating water constant temperature control system, including A pad, wherein a breeding tank, a microwave generating module, a circulating water treatment unit, a temperature detection network, an intelligent control center and a safety protection system are fixedly installed at the center of the top surface of the pad; A microwave generating module, comprising an insulation box, a heat exchange tube, a resonant tube, a magnetron, and a waveguide, wherein the insulation box is fixedly mounted on the top surface of a pad, and the resonant tube, magnetron, and waveguide are all detachably installed inside the insulation box, and the heat exchange tube passes through the insulation box; The circulating water treatment unit includes a drum filter, a water tank, and a flow sensor. The drum filter is fixedly installed on one side of the water tank. Both the drum filter and the water tank are installed on a corner of the top surface of the pad. The drum filter is connected to the aquaculture tank through the flow sensor. A temperature detection network, comprising a water quality monitoring probe and a multi-point distributed fiber optic temperature sensor, wherein the water quality monitoring probe and the multi-point distributed fiber optic temperature sensor are both installed on the aquaculture tank; The intelligent control center includes a touch-screen human-machine interface and a PLC controller. The touch-screen human-machine interface is fixedly installed on the side wall of the water tank, and the PLC controller is installed on the outside of the breeding tank. The safety protection system includes a high temperature alarm sensor, a resonant cavity pressure safety valve, and a microwave leakage monitoring probe. The resonant cavity pressure safety valve and the microwave leakage monitoring probe are both installed inside the insulation box, and the high temperature alarm sensor is installed on one end of the heat exchange tube.

[0007] In a preferred embodiment of the present invention, an insulation pad is fixedly installed at the center of the top surface of the pad, the insulation pad is sleeved between the bottom of the breeding tank and the pad, and an insulation box, a rotary drum filter device and a water tank are fixedly installed at the two corners of the top surface of the pad, respectively. A sealing plate is hinged to the side of the insulation box away from the breeding tank.

[0008] In a preferred embodiment of the present invention, a flow sensor is provided between the pad and the drum filter device. The flow sensor is fixedly installed on the top surface of the pad, and a circulating water pipe is connected to each end of the flow sensor. The flow sensor is connected to the breeding tank through the circulating water pipe at one end, and to the drum filter device through the circulating water pipe at the other end.

[0009] In a preferred embodiment of the present invention, a backwash pump is installed between the flow sensor and the drum filter device. The backwash pump is connected to the circulating water pipe between the drum filter device and the flow sensor. The drum filter device is provided with an inlet drain pipe. The flow sensor is connected to the inlet drain pipe through a corresponding circulating water pipe. A drive motor for starting and stopping is installed on one side of the drum filter device. A drain pipe is fixedly provided on the other side of the drum filter device. The drain pipe is connected to the inside of the drum filter device.

[0010] In a preferred embodiment of the present invention, the rotary drum filter is connected to a water tank, which is divided into three chambers. The chamber of the water tank closest to the rotary drum filter is filled with a layer of ceramic granules, the chamber in the middle of the water tank is filled with a layer of nitrocellulose, and the chamber of the water tank furthest from the rotary drum filter is connected to a circulating water pump and a heat exchange pipe via a circulating water pipe.

[0011] In a preferred embodiment of the present invention, the middle part of the heat preservation box is filled with a heat preservation layer for heat preservation, the resonant tube is located at the center of the heat preservation layer, the resonant tube has spiral resonant cavities with different spacings inside, the heat exchange tube passes through the center of the resonant tube, a microwave leakage monitoring probe is fixedly installed on both the upper and lower sides of the resonant tube, a resonant cavity pressure safety valve is installed at the junction of the heat exchange tube and the bottom of the resonant tube, and the high temperature alarm sensor is located at the end of the heat exchange tube away from the circulating water pump.

[0012] In a preferred embodiment of the present invention, a heat dissipation vent is provided on one side of the heat insulation box, the heat dissipation vent is located above the heat insulation layer, a fan is installed inside the heat insulation box, the fan corresponds to the heat dissipation vent, and an air guide is fixedly installed on the side of the fan away from the heat dissipation vent by bolts, the air guide is connected to the magnetron.

[0013] In a preferred embodiment of the present invention, the waveguide is located on the top surface of the resonant tube, and the waveguide is connected to the helical resonant cavity inside the resonant tube through a coupling hole. The magnetron is installed on the top surface of the waveguide, and the PLC controller is electrically connected to the flow sensor, the high temperature alarm sensor, the magnetron, the fan, the resonant cavity pressure safety valve, and two microwave leakage monitoring probes.

[0014] In a preferred embodiment of the present invention, multiple multi-point distributed fiber optic temperature sensors are provided, and the multiple multi-point distributed fiber optic temperature sensors are arranged in a circumferential array in the middle of the breeding tank. The PLC controller is connected to the water quality monitoring probe through wires, and the PLC controller is electrically connected to the multiple multi-point distributed fiber optic temperature sensors. The water quality monitoring probe is inserted into the breeding tank. The touch-screen human-machine interface is electrically connected to the backwash pump, drive motor, circulating water pump and PLC controller.

[0015] A method for using a microwave-based aquaculture recirculating water constant temperature control system includes the following steps: Step 1: System initialization and security self-check; Step 2: System operating parameter setting, circulating water pretreatment and process debugging; Step 3: Microwave heating and dual closed-loop constant temperature control are executed; Step 4: Remote monitoring of data detection, anomaly handling, and maintenance; Step 5: Data recording and system monitoring and maintenance.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The intelligent control center works in conjunction with the microwave generation module. By adopting a dual closed-loop control strategy, the inner loop controls the microwave power, allowing the microwaves to directly act on the water molecules. The outer loop regulates the circulation flow rate, enabling the device to dynamically optimize the temperature curve according to the aquaculture species and growth stage. The dual closed-loop control avoids power redundancy and solves the problems of slow heat conduction efficiency, high energy consumption, and local temperature differences under traditional electric heating.

[0017] 2. The temperature detection network, in conjunction with the safety protection system, uses a circular array of multi-point distributed fiber optic temperature sensors to construct a three-dimensional temperature field. Combined with a dual closed-loop control algorithm, it dynamically adjusts microwave power and circulation flow rate. Feedforward compensation is used to eliminate environmental interference. The heat exchange tubes are coaxially inserted with resonant tubes, ensuring uniform heating of the water without localized temperature differences. The temperature is dynamically adjusted based on the temperature conditions inside the aquaculture tank.

[0018] 3. The installation of a protective system, temperature detection network, and intelligent control center, along with water quality detection and temperature control, combined with circulating water purification, enables real-time adjustment based on the growth stage of the aquaculture species. This adapts to the high-precision temperature and environmental requirements of different aquaculture species, providing a stable and accurate temperature environment. Combined with an efficient water treatment system, it creates optimal aquaculture conditions, stabilizing the growth rate and survival rate of the aquaculture species.

[0019] 4. Supports remote monitoring and IoT access, intelligent control center and security protection system, establishes a three-level security protection system, realizes real-time all-round protection from early warning to emergency shutdown, adopts intelligent diagnosis and predictive maintenance, discovers and handles potential faults in advance, avoids the cost and defects of manual operation, and ensures that the device has an emergency handling mechanism to avoid equipment damage and aquaculture accidents.

[0020] 5. By setting up a microwave generating module and inserting a heat exchange tube through the center of the resonant tube, the insulation layer keeps the microwave excitation area warm. This utilizes the microwave to achieve heat exchange while protecting residual heat from loss. A multi-spacing spiral resonant cavity ensures a uniform microwave field distribution. Gradient heating is achieved through spiral grooves of varying depths within the resonant cavity, disrupting the uneven temperature distribution of microwaves in a single mode. This improves the overall heating uniformity within the spiral resonant cavity, preventing localized overheating. Combined with a safety protection system, microwave technology can be better integrated with aquaculture, avoiding safety hazards caused by excessive radiation or improper use, and enhancing the overall practicality of the device.

[0021] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0022] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A top-down view diagram; Figure 3 This is an external schematic diagram of the overall structure of the microwave generating module of the present invention; Figure 4 This is a schematic diagram of the overall structure of the microwave generating module of the present invention; Figure 5 This is a schematic diagram of the circulating water treatment unit of the present invention; Figure 6 This is a schematic cross-sectional view of the resonant cavity of the present invention; Figure 7 This is a schematic diagram of the temperature detection network of the present invention; Figure 8 This is a schematic diagram of the water circulation heating process of the present invention; Figure 9 This is a schematic diagram of the safety protection process of the present invention.

[0023] In the diagram: 10. Pad; 11. Breeding tank; 12. Touch-screen human-machine interface; 13. Insulation box; 14. Rotary drum filter; 15. Water tank; 16. Insulation pad; 17. Sealing plate; 18. Heat exchange tube; 19. Flow sensor; 20. Backwash pump; 21. Drive motor; 22. Inlet pipe; 23. Drain pipe; 24. High temperature alarm sensor; 25. Heat dissipation vent; 26. Insulation layer; 27. Resonant tube; 28. Circulating water pump; 29. ​​Circulating water pipe; 30. Magnetron; 32. Waveguide; 33. Air duct; 34. Fan; 35. Resonant cavity pressure safety valve; 36. Microwave leakage monitoring probe; 37. Helical resonant cavity; 38. Nitrocellulose layer; 39. Ceramsite layer; 40. Water quality monitoring probe; 41. Multi-point distributed fiber optic temperature sensor; 42. PLC controller. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0025] A microwave-based aquaculture recirculating water constant temperature control system and method, as shown in the figure, includes... The pad 10 is made of 304 stainless steel and has an anti-corrosion treatment. The top center of the pad 10 is fixed with a breeding tank 11, a microwave generating module, a circulating water treatment unit, a temperature detection network, an intelligent control center and a safety protection system. The breeding tank 11 is made of food-grade polyethylene. The breeding tank 11 is equipped with a water supply main pipe and a water outlet main pipe. The water supply main pipe is connected to the heat exchange pipe 18 and the water outlet main pipe is connected to the water tank 15. The microwave generating module includes an insulation box 13, a heat exchange tube 18, a resonant tube 27, a magnetron 30, and a waveguide 32. The resonant tube 27 is made of 316L stainless steel. The heat exchange tube 18 is made of a material that is compatible with microwave penetration. It can be made of quartz glass or food-grade PEEK engineering plastic according to actual cost requirements. The magnetron 30 is a water-cooled magnetron. The insulation box 13 is fixedly installed on the top surface of the pad 10. The resonant tube 27, the magnetron 30, and the waveguide 32 are all disassembled and installed in the insulation box 13. The heat exchange tube 18 passes through the insulation box 13. The circulating water treatment unit includes a drum filter 14, a water tank 15, and a flow sensor 19. The drum filter 14 has an 80-mesh stainless steel filter screen inside and is driven to rotate by a drive motor 21. The drum filter 14 is fixedly installed on one side of the water tank 15. Both the drum filter 14 and the water tank 15 are installed on one corner of the top surface of the pad 10. The drum filter 14 is connected to the breeding tank 11 through the flow sensor 19. Temperature detection network, which includes water quality monitoring probe 40 and multi-point distributed fiber optic temperature sensor 41, both of which are installed on aquaculture tank 11. The intelligent control center includes a touch-screen human-machine interface 12 and a PLC controller 42. The touch-screen human-machine interface 12 is fixedly installed on the side wall of the water tank 15, and the PLC controller 42 is installed on the outside of the breeding tank 11. The touch-screen human-machine interface 12 supports the selection of breeding species, setting of target water temperature, real-time display of water temperature, flow rate, power, dissolved oxygen and pH, and alarm record query. The safety protection system includes a high temperature alarm sensor 24, a resonant cavity pressure safety valve 35, and a microwave leakage monitoring probe 36. The resonant cavity pressure safety valve 35 and the microwave leakage monitoring probe 36 are both installed inside the insulation box 13, and the high temperature alarm sensor 24 is installed on one end of the heat exchange tube 18.

[0026] like Figure 1 , Figure 2 and Figure 8 As shown, a heat insulation pad 16 is fixedly installed at the center of the top surface of the pad 10. The heat insulation pad 16 is made of EPDM rubber. The heat insulation pad 16 is fitted between the bottom of the breeding tank 11 and the pad 10. A heat insulation box 13, a rotary drum filter device 14 and a water tank 15 are fixedly installed at the two corners of the top surface of the pad 10, respectively. A sealing plate 17 is hinged to the side of the heat insulation box 13 away from the breeding tank 11. The sealing plate 17 can be made of microwave shielding material, such as a metal spring sheet to achieve continuous conductive contact. At the same time, the sealing parts of each unit in this device are made of microwave resistant, corrosion resistant and high temperature resistant materials. like Figure 1 , Figure 2, Figure 4 and Figure 8 As shown, a flow sensor 19 is installed between the pad 10 and the drum filter device 14. The flow sensor 19 is fixedly installed on the top surface of the pad 10. The flow sensor 19 is equipped with a start-up connection valve and an air nozzle for supplying gas to the breeding tank 11. The bottom of the breeding tank 11 is connected to a drain pipe, and an air pipe is connected above the drain pipe. A circulating water pipe 29 is connected to each end of the flow sensor 19. The flow sensor 19 is connected to the breeding tank 11 through one end of the circulating water pipe 29, and to the drum filter device 14 through the other end of the circulating water pipe 29. like Figure 2 , Figure 5 and Figure 8 As shown, a backwash pump 20 is installed between the flow sensor 19 and the drum filter device 14. The flow sensor 19 is electromagnetic. Both ends of the flow sensor 19 are connected to the outlet of the breeding tank 11 and the backwash pump 20 through a section of circulating water pipe 29, respectively. It can be used to monitor the circulating water flow in real time. The backwash pump 20 is connected to the circulating water pipe 29 between the drum filter device 14 and the flow sensor 19. The backwash pump 20 is connected in parallel to the circulating water pipe between the flow sensor 19 and the drum filter device 14. The drum filter device 14 has an inlet drain pipe 22 on the top inner side. The flow sensor 19 is connected to the inlet drain pipe 22 through the corresponding circulating water pipe 29. A drive motor 21 for starting and stopping is installed on one side of the drum filter device 14. A drain pipe 23 is fixed on the bottom outer side of the other side of the drum filter device 14. The drain pipe 23 is electric and has an electric valve inside to control the start and stop. The drain pipe 23 is connected to the inside of the drum filter device 14. like Figure 4 , Figure 5 and Figure 8 As shown, the drum filter 14 is connected to the water tank 15, which is divided into three chambers. The chamber of the water tank 15 closest to the drum filter 14 is filled with a layer of ceramic particles 39 for filtering impurities. The chamber in the middle of the water tank 15 is filled with a layer of nitrated cotton 38 for removing ammonia nitrogen. The chamber of the water tank 15 furthest from the drum filter 14 is connected to a circulating water pump 28 and a heat exchange tube 18 via a circulating water pipe 29. This chamber is a clear water chamber for holding treated clear water, which is connected to the inlet end of the heat exchange tube 18 via the circulating water pump 28.

[0027] The working principle and control logic are as follows: Water containing uneaten feed, feces and ammonia nitrogen in the breeding tank 11 flows into the drain pipe through the outlet. The sewage is sensed by the flow sensor 19 and the water flows into the drum filter device 14. The drive motor 21 drives the filter screen to rotate, intercepting large particles of impurities. The impurities are discharged through the sewage pipe 23. The filtered water flows into the first chamber of the water tank 15. After passing through the ceramic granule layer 39 to filter out small impurities, the water flows into the second chamber. The nitrifying bacteria attached to the nitrifying cotton layer 38 convert ammonia nitrogen into nitrate. The purified water flows into the third chamber, the clear water chamber, and is sent into the heat exchange tube 18 by the circulating water pump 28 to complete the circulation.

[0028] like Figure 3 , Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the insulation box 13 adopts a double-layer stainless steel structure. The middle part of the insulation box 13 is filled with a thick rock wool insulation layer 26 for heat preservation. The resonant tube 27 is located in the center of the insulation layer 26. The resonant tube 27 has spiral resonant cavities 37 with different spacings inside. The spiral resonant cavities 37 are CNC machined. The inner side of the spiral resonant cavity 37 is divided into three sections with three different spacings of spiral grooves. The top inlet section is the preheating zone, and the groove length accounts for 30% of the entire spiral resonant cavity 37. Its pitch is sparse and the depth of the thread groove is shallow. The microwave field intensity in this area is relatively weak, which can gently preheat the water flow in the heat exchange tube 18. The central section is the main heating zone, and the groove length accounts for 30% of the entire spiral resonant cavity 37. Forty percent of the resonant cavity 37 has the densest and deepest threaded grooves. The microwave field intensity in this region is strongly mixed to provide core heating for the water flow in the heat exchange tube 18. The bottom outlet section is the balance zone, with the groove length accounting for thirty percent of the entire spiral resonant cavity 37. Its pitch is a densely distributed threaded groove with a density greater than that of the preheating zone but less than that of the main heating zone, and a depth deeper than that of the preheating zone but shallower than that of the main heating zone. The microwave field intensity in this region is slightly weaker than that of the center section but stronger than that of the inlet section. This is used to balance the water temperature to avoid excessive fluctuations in the outlet temperature and to make fuller use of energy. The heat exchange tube 18 is installed in the center of the resonant tube 27 to ensure that the water completely absorbs microwave energy. like Figure 3 , Figure 4 and Figure 6As shown, a heat dissipation vent 25 is provided on one side of the insulation box 13, located above the insulation layer 26. A fan 34 is installed inside the insulation box 13, corresponding to the heat dissipation vent 25. The heat dissipation vent 25 has a built-in dustproof mesh. An air guide duct 33 is fixedly installed on the side of the fan 34 away from the heat dissipation vent 25 by bolts. The air guide duct 33 connects to the magnetron 30. The fan 34 blows air directionally onto the water-cooling jacket of the magnetron 30 through the air guide duct 33, dissipating heat from the magnetron 30 while ensuring that the magnetron temperature is stable within a suitable range. A waveguide 32 is located on the top surface of the resonant tube 27. The bottom of the waveguide 32 is connected to the spiral resonant cavity 37 inside the resonant tube 27 through a coupling hole. The magnetron 30 is installed on the top surface of the waveguide 32. The working principle and control logic are as follows: After the magnetron 30 is energized, microwaves are generated and transmitted directionally to the spiral resonant cavity 37 of the resonant tube 27 via the waveguide 32. The segmented pitch of the spiral resonant cavity makes the microwaves form a uniform standing wave, and the electric field intensity is evenly distributed to avoid local overheating. The circulating water pump 28 sends the water from the clear water chamber of the water tank 15 into the heat exchange tube 18. The water is excited and absorbs energy in the microwave field, and the molecules vibrate at high frequency to raise the temperature. The heated water is sent to the main water supply pipe in the breeding tank 11 through the circulating water pipe 29. The hot water indirectly heats the water in the breeding tank 11 in the main water supply pipe, and then flows back into the clear water chamber of the water tank 15 through the outlet pipe to achieve overall constant temperature.

[0029] like Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, a microwave leakage monitoring probe 36 is fixedly installed on both the upper and lower sides of the resonant tube 27. A resonant cavity pressure safety valve 35 is installed at the junction of the heat exchange tube 18 and the bottom of the resonant tube 27. The high temperature alarm sensor 24 is located at the end of the heat exchange tube 18 away from the circulating water pump 28. The PLC controller 42 is electrically connected to the flow sensor 19, the high temperature alarm sensor 24, the magnetron 30, the fan 34, the resonant cavity pressure safety valve 35 and the two microwave leakage monitoring probes 36. The resonant cavity pressure safety valve 35 is spring-type. In addition, the intelligent control center is connected to the remote communication module, which supports remote monitoring, parameter modification and alarm push of mobile APP. In addition, an audible and visual alarm is installed on the edge of the pad 10. The audible and visual alarm is set close to the touch screen of the touch-screen human-machine interface 12. like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 9As shown, multiple multi-point distributed fiber optic temperature sensors 41 are arranged in a circumferential array in the middle of the aquaculture tank 11, distributed in three layers: surface, middle, and bottom. The PLC controller 42 is connected to the water quality monitoring probe 40 via wires. The PLC controller 42 is also connected to the multiple multi-point distributed fiber optic temperature sensors 41 via electrical signals. The water quality monitoring probe 40 is inserted into the aquaculture tank 11 and is a two-in-one probe used to measure dissolved oxygen and pH. It is fixed to the inside of the aquaculture tank 11 by a bracket and is inserted into the water. The touch-screen human-machine interface 12 is connected to the backwash pump 20, drive motor 21, circulating water pump 28, and PLC controller 42 via electrical signals. The magnetron 30 has an built-in NTC temperature sensor that collects temperature data in real time through the PLC controller 42. The fan 34 is connected to an audible and visual alarm via electrical signals to detect the temperature of the magnetron 30 and maintain the stable operation of the circulating water pump.

[0030] The control logic is as follows: First, the temperature detection and control closed loop is the inner loop control system. The three-dimensional water temperature in the breeding tank 11 is collected by the multi-point distributed optical fiber sensor 41 with three-layer circular distribution. The PLC controller 42 calculates the average value and compares it with the set target water temperature. The power of the magnetron is adjusted by the fuzzy PID algorithm. Next, the outer loop flow closed loop is used. The flow sensor 19 collects the circulating flow. The PLC controller 42 adjusts the speed of the circulating water pump 28 according to the water temperature deviation. The two loops work together to control the water temperature fluctuation within the minimum error and approach the set temperature standard. Second, the microwave leakage detection probe 36 monitors the microwave field in real time. If the microwave leakage detection probe 36 detects a leak, it immediately cuts off the power to the magnetron 30, activates the audible and visual alarm, and pushes the microwave leakage alarm to the APP. The high temperature alarm sensor monitors the temperature of the heat exchange tube 18 in real time. If the water temperature exceeds the appropriate temperature, it cuts off the power to the magnetron 30 to keep the circulating water running and prevent the water from overheating. At the same time, if the pressure in the resonant tube 27 is too high and exceeds the set value, the resonant cavity pressure safety valve 35 automatically releases the pressure and returns to its seat after depressurization. The PLC controller 42 records the pressure abnormality log.

[0031] A method for using a microwave-based aquaculture recirculating water constant temperature control system, such as... Figure 8 and Figure 9 As shown, it includes the following steps: Step 1: System initialization and safety self-test; Open the insulation box 13 sealing plate 17, check that the resonant tube 27 and magnetron 30 are undamaged, and that the fluororubber material of the waveguide 32 coupling hole sealing gasket is not aged; check that the filter screen of the drum filter device 14 is not torn, and that the ceramsite layer 39 and nitrocellulose layer 38 of the water tank 15 are not displaced; close the sealing plate 17 to ensure that the sealing strip is tightly fitted; start the touch-screen human-machine interface 12, click system self-test, and the PLC is tested in sequence. The fiber optic sensor, water quality probe, and flow sensor feedback are normal. The circulating water pump 28, backwash pump 20, drive motor 21, and fan 34 start and stop normally. Trigger the microwave leakage probe 36 test button, the audible and visual alarm is activated, the magnetron is powered off to verify the protection logic, and the touch-screen human-machine interface 12 is connected through the mobile APP to confirm that the real-time data can be displayed normally and the alarm push function is normal.

[0032] Step 2: System operating parameter setting, circulating water pretreatment and process debugging; Select the seedling stage mode on the touch-screen human-machine interface 12. The system automatically calls preset parameters to set the time, circulation flow rate, backwash trigger threshold, and water quality alarm threshold. Then, circulating water pretreatment is performed. Click "Start Circulation," and the PLC controller 42 controls the circulating water pump 28 and drive motor 21 to start. Water in the clear water chamber of the water tank 15 flows through the circulating water pump 28 into the heat exchange tube 18, and then into the breeding tank 11. Wastewater in the breeding tank 11 is then filtered by the flow sensor 19 via the drain pipe into the drum filter device 14, and then... The water is filtered from the first and second chambers of the water tank 15 to the third chamber. The drive motor 21 drives the filter screen to rotate, and the inlet pipe 22 sprays water to rinse the inside of the filter screen. Impurities are discharged through the drain pipe 23. After the circulating water has been running for a certain period of time, the flow sensor 19 shows that the flow rate is stable. The PLC controller 42 automatically starts the backwash pump 20 to rinse. After rinsing, the flow rate does not drop significantly, which verifies the patency of the filter screen. The PLV controller 42 reads the data from the water quality monitoring probe 40. If the dissolved oxygen content is lower than the threshold, the PLC controller 42 links the external aerator to start, increasing the dissolved oxygen content until the appropriate threshold is reached to proceed to the next step.

[0033] Step 3: Microwave heating and dual closed-loop constant temperature control are executed. Click to start the microwave. The PLC controller 42 controls the magnetron 30 to be powered on, and the fan 34 runs. The microwave is transmitted to the spiral resonant cavity 37 through the waveguide 32 to heat the water in the heat exchange tube 18. In the inner loop control state, the PLC controller 42 calculates the water temperature deviation based on the ambient temperature and adjusts the magnetron power to control the temperature. In the outer loop state, the speed and flow rate of the circulating water pump 28 are adjusted according to the ambient temperature difference and temperature changes to accelerate water circulation. The multi-point distributed fiber optic temperature sensor 41 collects the three-dimensional water temperature in the breeding tank 11 at regular intervals. The PLC controller 42 calculates the average value and adjusts the speed of the circulating water pump 28 appropriately to improve the water mixing uniformity. The water quality monitoring probe 40 collects data at regular intervals to detect water quality data and pushes alarm data through the APP. Sodium bicarbonate is added manually according to the actual situation.

[0034] Step 4: Remote monitoring data detection, anomaly handling and maintenance; Aquaculture personnel can view water temperature, flow rate, microwave power, dissolved oxygen content, microwave field safety status, dirt and impurities in the drum filter 14 and magnetron temperature in real time via a mobile APP; The intelligent control center and safety protection system monitor in real time and coordinate with the audible and visual alarms to report abnormal situations; the PLC controller 42 controls the start and stop of each electronic component; Aquaculture personnel prepare for on-site inspections, select and replace the aging of the waveguide 32 coupling hole, the pad 10 insulation pad 16 and each sealing gasket; the PLC automatically starts the backwash pump 20, opens the drain pipe 23 electric valve to select flushing; manual replacement of the nitrocellulose layer 38 according to usage; regularly check the alarm log through the APP to check whether the circulating water flow and water quality are normal; regularly open the end cover of the drum filter 14 to clean stubborn impurities on the filter screen surface; regularly disassemble the waveguide 32 to check the inner wall gold plating layer; regularly replace the nitrocellulose layer 38 in the water tank 15, clean the ceramic granule layer 39; and regularly calibrate the fiber optic temperature sensor 41 and the water quality monitoring probe 40.

[0035] Step 5: Data Recording and System Monitoring & Maintenance; After the seedling cycle ends, click on the touch-screen human-machine interface 12 to export data, select the export time period, and the data storage module will export the following data to a USB flash drive: water temperature change curve, microwave power adjustment record, circulation flow record, water quality data, and alarm record. The system will then be shut down for maintenance. The PLC will reduce the power of the magnetron 30 to maintain the circulating water. The 28 pump will run until the outlet water temperature of the heat exchange tube 18 drops below 28℃. The power supply to the magnetron 30 will be cut off, and the circulating water pump 28 will continue to run to flush the heat exchange tube 18 and the circulating water pipe 29. After cleaning, the circulating water pump 28, drive motor 21, and fan 34 will be turned off. The drain valve of the water tank 15 will be manually opened to drain the three-chamber water. The heat exchange tube 18 will be disassembled, and the scale inside the tube will be cleaned. The main power supply to the gasket 10 will be turned off, and the dust cover will be covered. The system monitoring and maintenance summary will be completed, and the seedling cycle data will be statistically analyzed.

[0036] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A microwave energy based constant temperature control system for recirculating water in aquaculture, characterized by, The utility model relates to a kind of aquaculture system, including The top surface center of the backing plate (10) is fixed with aquaculture barrel (11), microwave generating module, circulating water treatment unit, temperature detection network, intelligent control center and safety protection system; The microwave generating module includes heat preservation box (13), heat exchange pipe (18), resonant tube (27), magnetron (30) and waveguide (32), the heat preservation box (13) is fixedly arranged on the top surface of backing plate (10), the resonant tube (27), magnetron (30) and waveguide (32) are all detachably installed in heat preservation box (13), and the heat exchange pipe (18) is arranged in heat preservation box (13). The circulating water treatment unit includes rotary drum filter device (14), water tank (15) and flow sensor (19), the rotary drum filter device (14) is fixedly arranged on one side of water tank (15), and the rotary drum filter device (14) and water tank (15) are both installed in one corner of the top surface of backing plate (10), and the rotary drum filter device (14) is communicated with aquaculture barrel (11) through flow sensor (19). The temperature detection network includes water quality monitoring probe (40) and multipoint distributed optical fiber temperature sensor (41), and the water quality monitoring probe (40) and multipoint distributed optical fiber temperature sensor (41) are both installed on aquaculture barrel (11). The intelligent control center includes touch human-computer interaction interface (12) and PLC controller (42), the touch human-computer interaction interface (12) is fixedly arranged on the side wall surface of water tank (15), and the PLC controller (42) is installed outside aquaculture barrel (11). The safety protection system includes high-temperature alarm sensor (24), resonant cavity pressure safety valve (35) and microwave leakage monitoring probe (36), the resonant cavity pressure safety valve (35) and microwave leakage monitoring probe (36) are both arranged in heat preservation box (13), and the high-temperature alarm sensor (24) is arranged on one end of heat exchange pipe (18).

2. A microwave-based aquaculture recirculating water thermostatic control system according to claim 1, wherein, The top surface center of the backing plate (10) is fixedly installed with heat preservation pad (16), the heat preservation pad (16) is sleeved between the bottom of aquaculture barrel (11) and backing plate (10), and the top surface of backing plate (10) is fixedly provided with heat preservation box (13), rotary drum filter device (14) and water tank (15) at two corners respectively, and the side, away from aquaculture barrel (11), of heat preservation box (13) is hingedly connected with sealing plate (17) by hinge.

3. A microwave-based aquaculture recirculating water thermostatic control system according to claim 2, wherein, The flow sensor (19) is fixedly arranged on the top surface of backing plate (10), one end of the flow sensor (19) is communicated with one circulating water pipe (29), the flow sensor (19) is communicated with aquaculture barrel (11) through the circulating water pipe (29) at one end, and the flow sensor (19) is communicated with rotary drum filter device (14) through the circulating water pipe (29) at the other end.

4. A microwave-based aquaculture recirculating water thermostatic control system according to claim 3, wherein, The backwash pump (20) is installed between the flow sensor (19) and the rotary drum filter device (14), the backwash pump (20) is communicated with the circulating water pipe (29) between the rotary drum filter device (14) and the flow sensor (19), the water inlet pipe (22) is arranged in the rotary drum filter device (14), the flow sensor (19) is communicated with the water inlet pipe (22) through the corresponding circulating water pipe (29), the drive motor (21) for driving start and stop is installed on one side of the rotary drum filter device (14), the blowdown pipe (23) is fixedly arranged on the other side of the rotary drum filter device (14), and the blowdown pipe (23) is communicated with the inside of the rotary drum filter device (14).

5. A microwave-based aquaculture recirculating water thermostatic control system according to claim 4, wherein, The rotary drum filter device (14) is communicated with the water tank (15), the water tank (15) is divided into three chambers, the chamber close to the rotary drum filter device (14) of the water tank (15) is filled with the ceramic layer (39), the chamber in the middle of the water tank (15) is filled with the nitrocellulose layer (38), and the chamber away from the rotary drum filter device (14) of the water tank (15) is communicated with the circulating water pump (28) and the heat exchange pipe (18) through the circulating water pipe (29).

6. A microwave-based aquaculture recirculating water thermostatic control system according to claim 5, wherein, The middle of the heat preservation box (13) is filled with the heat preservation layer (26) for heat preservation, the resonant pipe (27) is located at the center of the heat preservation layer (26), the resonant pipe (27) is provided with spiral resonant cavities (37) with different intervals, the heat exchange pipe (18) is arranged at the center of the resonant pipe (27), the resonant pipe (27) is provided with a microwave leakage monitoring probe (36) on each of the upper side and the lower side, the resonant cavity pressure safety valve (35) is arranged at the junction of the heat exchange pipe (18) and the bottom of the resonant pipe (27), and the high-temperature alarm sensor (24) is arranged at one end of the heat exchange pipe (18) away from the circulating water pump (28).

7. A microwave-based aquaculture recirculating water thermostatic control system according to claim 6, wherein, The heat preservation box (13) is provided with a heat dissipation opening (25) on one side, the heat dissipation opening (25) is located above the heat preservation layer (26), the heat preservation box (13) is provided with a fan (34) on the inside, the fan (34) corresponds to the heat dissipation opening (25), the fan (34) is provided with a wind guide channel (33) on the side away from the heat dissipation opening (25) and is fixedly arranged through bolts, and the wind guide channel (33) is communicated with the magnetron (30).

8. A microwave-based aquaculture recirculating water thermostatic control system according to claim 7, wherein, The waveguide (32) is arranged on the top surface of the resonant pipe (27), the waveguide (32) is communicated with the spiral resonant cavities (37) in the resonant pipe (27) through a coupling hole, the magnetron (30) is arranged on the top surface of the waveguide (32), and the PLC controller (42) is electrically connected with the flow sensor (19), the high-temperature alarm sensor (24), the magnetron (30), the fan (34), the resonant cavity pressure safety valve (35) and the two microwave leakage monitoring probes (36).

9. A microwave-based aquaculture recirculating water thermostatic control system according to claim 8, wherein, The multiple multi-point distributed optical fiber temperature sensors (41) are circumferentially arranged in the middle part of the culture barrel (11), the PLC controller (42) is connected with the water quality monitoring probe (40) through wires, the PLC controller (42) is electrically connected with the multiple multi-point distributed optical fiber temperature sensors (41), the water quality monitoring probe (40) is inserted into the culture barrel (11), and the touch-type man-machine interface (12) is electrically connected with the backwashing pump (20), the driving motor (21), the circulating water pump (28) and the PLC controller (42).

10. A method for using a microwave energy-based constant temperature control system for aquaculture circulating water, comprising the following steps: Step 1: system initialization and safety self-checking; Step 2: system operating parameter setting, circulating water pretreatment and process debugging; Step 3: microwave heating and double closed-loop constant temperature control execution; Step 4: remote monitoring data detection, abnormality processing and maintenance; Step 5: data recording and system monitoring and maintenance.

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