Temperature-controlled water circulation device for breeding of rosy shrimp

Abstract

A kind of roe shrimp breeding water circulation device with temperature control belongs to aquaculture equipment technical field, by control cabinet, power box, heating cylinder, eddy current coil, water inlet component, drainage component, sensor component and liquid level switch component jointly constitute, sensor component signal is transmitted to control cabinet, control cabinet starts eddy current coil heating, submersible pump will water be pumped into heating cylinder, and the water after heating is sent back to the breeding pond by water jet pipe by drainage pump.The whole device is simple to operate, without manual 24 hours on duty, compared with the energy consumption of traditional coal-fired boiler mode is lower, the device heat efficiency is high, reduces the labor input, energy-saving effect is remarkable, the breeding cost is greatly reduced, and completely avoids the risk of carbon monoxide poisoning, guarantees the safety of personnel.

Description

Technical Field

[0001] This utility model belongs to the technical field of aquaculture equipment, and relates to an aquaculture heating device, specifically a temperature-controlled water circulation device for raising and breeding giant freshwater prawns. Background Technology

[0002] The giant freshwater prawn (Macrobrachium rosenbergii), also known as the Malaysian prawn or freshwater long-armed prawn, originated in Southeast Asia and was introduced to China from Japan in 1976. It is characterized by rapid growth, a wide diet, and strong disease resistance, and is one of the three most productive shrimp species in the world. In China, giant freshwater prawns are produced in 17 provinces, municipalities, and autonomous regions, including Guangdong and Jiangsu. Currently, earthen ponds and greenhouses are the main forms of giant freshwater prawn production in my country, primarily involving the seedling rearing and rearing processes. During the seedling rearing process, strict requirements are placed on water temperature, dissolved oxygen levels, and feed management. In particular, the seedlings are very sensitive to water temperature, requiring a temperature of 26–32 degrees Celsius. Currently, to meet the market demand for live giant freshwater prawns during the Spring Festival and to bring them to market earlier, thereby improving farming efficiency, the stocking time for giant freshwater prawns has been brought forward to early November. At this time, outdoor temperatures are low. To raise the water temperature in the nursery ponds, farmers typically use coal-fired boilers to raise the water temperature to around 30 degrees Celsius. These boilers require manual operation 24 hours a day, resulting in long heating times and low efficiency. For a typical 50×7 meter shrimp pond, this requires 1.2 tons of coal per day. At 1400 yuan per ton, the daily coal cost is around 1700 yuan, which is both labor-intensive and energy-intensive, undoubtedly increasing the farming costs for shrimp farmers. Furthermore, coal-fired boilers located in enclosed indoor spaces are highly susceptible to carbon monoxide poisoning, posing a safety hazard, and their emissions also pollute the environment. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of current methods for heating shrimp ponds using coal-fired boilers, which suffer from long heating times, low heating efficiency, high costs for shrimp farmers, and the risk of carbon monoxide poisoning. This invention proposes a temperature-controlled water circulation device for raising and breeding giant freshwater prawns. The device features a novel structure, rapid heating, high heating efficiency, improved safety, and further reduced costs for shrimp farmers.

[0004] The temperature-controlled water circulation device for raising and culturing giant freshwater prawns provided in this application adopts the following technical solution:

[0005] A temperature-controlled water circulation device for raising and culturing giant freshwater prawns, comprising a control cabinet and a power supply box; characterized in that the device further comprises:

[0006] Heating cylinder, used for holding and conducting heat of circulating water;

[0007] An eddy current coil is wound around the outer wall of the heating cylinder and connected to the power supply box;

[0008] The water inlet assembly consists of a water inlet pipe and a submersible pump. The submersible pump is placed in the seedling tank, and the water inlet pipe is connected to the upper edge of the heating cylinder.

[0009] The drainage assembly consists of a drainage pipe, a drainage pump, and a spray pipe. The spray pipe is placed in the seedling pool. One end of the drainage pump is connected to the bottom of the heating cylinder through the drainage pipe, and the other end is connected to the spray pipe through the drainage pipe.

[0010] The sensor assembly consists of a first temperature sensor and a second temperature sensor. The first temperature sensor is placed in the seedling tank, and the second temperature sensor is placed in the heating cylinder. Both sensors are connected to the control cabinet for feedback.

[0011] The liquid level switch assembly consists of a high liquid level switch and a low liquid level switch. The high liquid level switch is located at the upper end of the inner wall of the heating cylinder, and the low liquid level switch is located at the lower end of the inner wall of the heating cylinder. Both liquid level switches are connected to the control cabinet via feedback.

[0012] By adopting the above technical solution, the heating cylinder contains circulating water and conducts heat. Eddy current coils are wound around the outer wall of the heating cylinder and connected to the power supply box to generate heat. A submersible pump in the water inlet assembly is placed in the seedling tank and injects water into the heating cylinder through the inlet pipe. A drain pump in the drainage assembly transports water from the bottom of the heating cylinder to the spray pipe in the seedling tank through the drain pipe. Two temperature sensors detect the water temperature in the seedling tank and the heating cylinder respectively and feed the signals back to the control cabinet. The control cabinet controls the power supply box to adjust the heating power of the eddy current coils based on the temperature signals. High and low level switches monitor the water level in the heating cylinder. When the water level is lower than the low level switch or higher than the high level switch, a corresponding signal is triggered to the control cabinet, which then controls the operation of the submersible pump and the drain pump to regulate the water level.

[0013] Furthermore, an insulation layer is wound around the outer wall of the heating cylinder, the thickness of which does not exceed 20mm; the eddy current coil is wound around the outside of the insulation layer, and the height of the eddy current coil is lower than the height of the heating cylinder.

[0014] By adopting the above technical solution, the insulation layer is wrapped around the outer wall of the heating cylinder. On the one hand, it can reduce the heat loss inside the heating cylinder, improve the heating efficiency, and reduce energy consumption. On the other hand, it is conducive to the winding and installation of the eddy current coil on the surface of the heating cylinder, increases the friction between the coil and the heating cylinder, and prevents the coil from sliding down the surface of the cylinder.

[0015] Furthermore, a protective layer is provided on the outside of the eddy current coil, the height of which is higher than the winding height of the eddy current coil, and the thickness of the protective layer does not exceed 1.5 mm.

[0016] By adopting the above technical solution, a protective layer is set on the outside of the eddy current coil. On the one hand, the eddy current coil can be protected from external physical damage and corrosion, effectively extending the service life of the eddy current coil and improving its operational reliability; on the other hand, it can provide safety protection for operators.

[0017] Furthermore, the installation height of the high liquid level switch exceeds the winding height of the eddy current coil, and the height of the low liquid level switch exceeds the height of the drain pipe axis.

[0018] By adopting the above technical solution and setting the installation height of the two liquid level switches, it can be ensured that when the water level reaches the high liquid level switch, the water can fully cover the area heated by the eddy current coil; when the water level is lower than the low liquid level switch, the drainage operation of the drain pipe can be stopped in time to prevent the water in the heating cylinder from being pumped dry. This further optimizes the accuracy of liquid level control, ensures that the water in the heating cylinder remains at a suitable level during the heating process, avoids equipment failure and safety hazards caused by abnormal water levels, and improves the safety and stability of the entire device.

[0019] Furthermore, the water spray pipe is threadedly connected to the drain pipe via a pipe joint, and the two can rotate relative to each other. Several water spray holes are evenly distributed on the water spray pipe.

[0020] By adopting the above technical solution, the water spray pipe and the drainage pipe can be rotated and adjusted. On the one hand, this facilitates installation and disassembly. On the other hand, the relative rotation allows for flexible adjustment of the water spray angle and direction, making the water flow more evenly distributed in the nursery pond. This is beneficial to the growth and development of giant freshwater prawns and improves the quality of aquaculture.

[0021] Furthermore, the spray hole is an elliptical flat hole, and the angle between the center of the spray hole and the center of the bottom of the spray pipe is in the range of 50-60°.

[0022] By adopting the above technical solution, the shape and angle of the spray nozzles can be set to create a diffused water flow at a certain angle when the water is sprayed out. This allows the sprayed water to be more evenly distributed in the nursery pond, increasing the dissolved oxygen content and water flow turbulence. This is beneficial for the giant freshwater prawns to obtain sufficient oxygen and food, and avoids the situation where the water flow from ordinary circular nozzles is too concentrated and causes a strong impact on the giant freshwater prawns. It simulates a water flow environment that is closer to nature, which is conducive to the growth and health of the giant freshwater prawns.

[0023] Furthermore, the water spray pipe is mounted above the water surface of the seedling pond via multiple supports, with the distance between the pipe and the water surface ranging from 50 to 150 mm.

[0024] By adopting the above technical solution, on the one hand, the water flow can be fully diffused after being sprayed out, forming a uniform water flow dynamic that covers the entire water surface area of ​​the nursery pond, which is conducive to promoting water exchange and dissolved oxygen distribution, and improving the living space and growth conditions of giant freshwater prawns; on the other hand, it also avoids scalding the prawns with hot water flow, reduces the impact on the pond bottom, reduces the agitation of sludge and impurities at the bottom of the pond, and maintains the cleanliness of the water.

[0025] Furthermore, a plug is provided at the end of the water spray pipe.

[0026] By adopting the above technical solution, a plug is connected to the end of the spray pipe to prevent water from spraying out from the end, ensuring the water pressure of each spray hole, improving the uniformity and coverage of the water flow, and further optimizing the dynamic water flow environment in the nursery pond, which is conducive to the uniform feeding and growth of giant freshwater prawns.

[0027] Furthermore, the seedling pond is equipped with a filter screen box, and the submersible pump is placed inside the filter screen box.

[0028] By adopting the above technical solution, impurities and particulate matter in the water are filtered out through the filter screen box, preventing impurities from entering the submersible pump and heating cylinder, reducing the equipment failure rate, extending the service life of the equipment, and at the same time, the filtered water is cleaner, which is conducive to the growth and health of giant freshwater prawns and improves the overall quality of aquaculture.

[0029] In summary, this utility model has at least one of the following beneficial technical effects:

[0030] (1) This utility model adopts eddy current coil heating technology, which significantly reduces energy consumption compared with traditional coal-fired boiler heating methods. It can significantly reduce daily energy consumption costs and avoid high coal costs. At the same time, it does not require manual operation 24 hours a day, reducing labor costs and effectively reducing the breeding costs of shrimp farmers.

[0031] (2) This utility model abandons the traditional coal-fired boiler heating method, eliminates the safety hazard of carbon monoxide poisoning that may be caused by burning coal, and protects the lives of farmers. At the same time, the device is equipped with a protective layer, which can protect the eddy current coil from external physical damage and corrosion, extend its service life, and prevent operators from accidentally touching the eddy current coil and getting injured, further improving the safety of the equipment.

[0032] (3) This invention uses sensor components to monitor the water temperature in the nursery pond and heating cylinder in real time, and feeds the signal back to the control cabinet. The control cabinet precisely adjusts the heating power of the eddy current coil according to the temperature signal, which can stably control the water temperature within the suitable range of 26-32 degrees Celsius for the growth of giant freshwater prawns, meeting the strict requirements of prawn larvae for water temperature. It is especially suitable for early stocking when the outdoor temperature is low, providing stable temperature conditions for the growth of giant freshwater prawns and helping to improve the survival rate and growth rate of prawn larvae. Precise temperature control provides a high-quality breeding environment.

[0033] (4) The design of the spray nozzle of this utility model can make the water flow more evenly dispersed in the nursery pond, avoiding the impact of the water flow being too concentrated on the giant freshwater prawns, while increasing the dissolved oxygen content and water flow disturbance of the water body, which is conducive to the giant freshwater prawns obtaining sufficient oxygen and food, simulating a water flow environment close to nature, promoting the healthy growth of giant freshwater prawns, and improving the quality of breeding.

[0034] (5) The insulation layer wrapped around the outer wall of the heating cylinder of this utility model not only improves the heating efficiency, but also increases the friction between the eddy current coil and the heating cylinder, preventing the coil from slipping down, which is conducive to the stable installation and long-term use of the eddy current coil. The filter screen box in the seedling pond can effectively filter impurities and particulate matter in the water, preventing impurities from entering the submersible pump and the heating cylinder, reducing the equipment failure rate, reducing the number of maintenance and repair costs, extending the service life of the entire device, and ensuring the smooth progress of the breeding process. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention in use.

[0036] Figure 2 This is a schematic diagram of the internal structure of the heating cylinder in this utility model.

[0037] Figure 3 This is a schematic diagram of the water spray pipe structure in this utility model.

[0038] Figure 4 for Figure 3 A schematic diagram of the full cross-section along the AA direction.

[0039] In the diagram: 1. Heating cylinder; 2. Protective layer; 3. Control cabinet; 4. Power supply box; 5. Power cord; 6. Signal line; 7. Filter screen box; 8. Water inlet pipe; 9. Drain pump; 10. Drain pipe; 11. Spray pipe; 12. Submersible pump; 13. Spray hole; 14. Pipe joint; 15. Plug; 16. First temperature sensor; 17. Seedling pool; 18. High liquid level switch; 19. Low liquid level switch; 20. Second temperature sensor; 21. Insulation layer; 22. Eddy current coil. Detailed Implementation

[0040] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0041] Example 1

[0042] Taking a 50m×7m×1.5m nursery pond as an example, the temperature-controlled water circulation device for raising and breeding freshwater prawns is used to provide suitable water temperature for the prawn larvae.

[0043] Basic structure installation:

[0044] The heating cylinder is a cylindrical stainless steel cylinder with a diameter of 0.8 meters and a height of 1 meter. It is placed on a base next to the seedling pond. The upper edge is connected to a submersible pump through a water inlet pipe, and the lower part is connected to a drainage pump through a drain pipe.

[0045] The eddy current coil is made of copper wire and tightly wound around the insulation layer (20mm thick polyurethane foam) on the outer wall of the heating cylinder, at a height of 0.8 meters from the bottom of the cylinder, to ensure that the water temperature rises evenly during heating. The eddy current coil is covered with a 1.5mm silica aerogel layer to ensure safety during use.

[0046] The power supply box provides a stable AC power supply to the device, and connects to the eddy current coil for heating.

[0047] Control system and sensor configuration:

[0048] The control cabinet has a built-in microcomputer controller with preset water temperature limits of 26℃-32℃. The first temperature sensor is placed in the middle of the seedling tank at a water depth of 0.5 meters, and the second temperature sensor is located at the bottom of the heating cylinder at 0.2 meters, which monitors the water temperature in real time and feeds it back to the control cabinet.

[0049] The high-level switch is installed on the inner wall of the heating cylinder 0.1 meters from the top, and the low-level switch is installed 0.1 meters from the bottom. They monitor the water level and send a signal back to the control cabinet.

[0050] Operating status:

[0051] When the water temperature in the seedling tray drops below 26℃, the first temperature sensor sends a signal to the control cabinet, which then instructs the power supply box to increase the power of the eddy current coil to accelerate the heating process. A submersible pump injects water from the seedling tray into the heating cylinder through the inlet pipe, while a drain pump simultaneously activates, returning hot water from the bottom of the heating cylinder to the seedling tray via a spray pipe. The spray pipe is positioned 100mm above the water surface, with elliptical nozzles evenly distributed at a 60° angle, ensuring the hot water is evenly distributed throughout the seedling tray and rapidly raising the water temperature.

[0052] If the water level inside the heating cylinder drops below the low-level switch during heating, the control cabinet immediately instructs the submersible pump to replenish water to prevent dry burning. When the water level rises above the high-level switch, the control cabinet instructs the drain pump to drain water to maintain a suitable water level and ensure the safe and stable operation of the device.

[0053] After one week of testing, the water temperature in the nursery pond stabilized at 28℃-30℃, and the shrimp larvae survival rate increased by approximately 20% compared to traditional coal-fired boiler heating methods. Simultaneously, the device achieved a thermal efficiency of 95%, reducing energy consumption by 40% compared to traditional methods, and lowering daily energy costs from 1700 yuan to approximately 1000 yuan, demonstrating significant energy savings. Furthermore, the entire device is simple to operate, requiring no 24-hour manual supervision, reducing labor input, significantly lowering aquaculture costs, and completely eliminating the risk of carbon monoxide poisoning, ensuring personnel safety.

[0054] Example 2

[0055] Taking a seedling pond with dimensions of 20 meters × 5 meters × 1 meter as an example, this temperature-controlled water circulation device is used for seedling cultivation.

[0056] Basic structure installation:

[0057] The heating cylinder is a cylindrical titanium alloy cylinder with a diameter of 0.5 meters and a height of 0.8 meters. It is installed on a bracket next to the seedling pond and is connected to the water inlet and outlet pipes through corrosion-resistant pipes.

[0058] The eddy current coil is made of corrosion-resistant special alloy wire and is wound around the insulation layer (10mm thick) on the outer wall of the heating cylinder. The winding height is 0.6 meters to accommodate smaller seedling ponds.

[0059] Control system and sensor configuration:

[0060] The control cabinet uses a PLC control system with preset water temperature upper and lower limits of 26℃-32℃. The first temperature sensor is installed 0.5 meters underwater at the center of the seedling pond, and the second temperature sensor is installed 0.1 meters at the bottom of the heating cylinder, which monitors the water temperature in real time and feeds it back to the control cabinet.

[0061] The high-level switch is installed on the inner wall of the heating cylinder 0.05 meters from the top, and the low-level switch is installed 0.05 meters from the bottom. They are connected to the control cabinet and used to monitor and control the water level.

[0062] Operating status:

[0063] In the early stages of seedling cultivation, due to the low outdoor temperature, the water temperature in the seedling pond drops to 25℃. The first temperature sensor transmits a signal to the control cabinet. The control cabinet activates the eddy current coil heating, and the submersible pump draws water into the heating cylinder. The drain pump then returns the heated water to the seedling pond via a spray pipe. The spray pipe is mounted on a bracket 80 mm above the water surface. The spray holes are elliptical, with the center of the hole and the center of the pipe bottom forming a 55° angle, ensuring that the water flow is evenly distributed across the entire surface of the seedling pond, creating good water circulation and quickly raising the water temperature to a suitable range.

[0064] When the water level inside the heating cylinder drops to the low level switch due to evaporation or other factors, the control cabinet promptly instructs the submersible pump to replenish water, ensuring a stable water level inside the heating cylinder and maintaining normal heating and circulation functions.

[0065] After using this device, the water temperature in the nursery pond can be stably maintained between 28℃ and 31℃, accelerating the growth rate of shrimp larvae and increasing the survival rate by approximately 25%. The device's thermal efficiency reaches over 96%, reducing energy consumption by 35% compared to traditional heating methods, and lowering daily energy costs from approximately 800 yuan to approximately 500 yuan, significantly reducing aquaculture costs. Simultaneously, the device's automated control system reduces manual intervention, lowering labor costs. Furthermore, the filter screens remove impurities, reducing equipment failure rates, extending equipment lifespan, and improving the overall quality and efficiency of aquaculture, bringing significant economic benefits to small-scale nursery bases.

Claims

1. A temperature-controlled water circulation device for raising and breeding giant freshwater prawns, comprising a control cabinet (3) and a power supply box (4); characterized in that, The device further includes: Heating cylinder (1) is used for holding and conducting heat of circulating water; Eddy current coil (22) is wound around the outer wall of the heating cylinder (1) and connected to the power supply box (4); The water inlet assembly consists of a water inlet pipe (8) and a submersible pump (12). The submersible pump (12) is placed in the seedling tank (17), and the water inlet pipe (8) is connected to the upper edge of the heating cylinder (1). The drainage assembly is composed of a drainage pipe (10), a drainage pump (9), and a spray pipe (11). The spray pipe (11) is placed in the seedling pond (17). One end of the drainage pump (9) is connected to the bottom of the heating cylinder (1) through the drainage pipe (10), and the other end is connected to the spray pipe (11) through the drainage pipe (10). The sensor assembly consists of a first temperature sensor (16) and a second temperature sensor (20). The first temperature sensor (16) is placed in the seedling pool (17), and the second temperature sensor (20) is placed in the heating cylinder (1). Both sensors are connected to the control cabinet (3) for feedback. The liquid level switch assembly consists of a high liquid level switch (18) and a low liquid level switch (19). The high liquid level switch (18) is placed on the upper end of the inner wall of the heating cylinder (1), and the low liquid level switch (19) is placed on the lower end of the inner wall of the heating cylinder (1). Both liquid level switches are connected to the control cabinet (3) in a feedback manner.

2. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 1, characterized in that: The outer wall of the heating cylinder (1) is wound with a heat insulation layer (21) with a thickness not exceeding 20mm; the eddy current coil (22) is wound outside the heat insulation layer (21) and the height of the eddy current coil (22) is lower than the height of the heating cylinder (1).

3. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 1, characterized in that: The outer side of the eddy current coil (22) is covered with a protective layer (2), the height of the protective layer (2) is higher than the winding height of the eddy current coil (22), and the thickness of the protective layer (2) does not exceed 1.5mm.

4. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 1, characterized in that: The installation height of the high liquid level switch (18) exceeds the winding height of the eddy current coil (22), and the height of the low liquid level switch (19) exceeds the pipe axis height of the drain pipe (10).

5. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 1, characterized in that: The water spray pipe (11) is threadedly connected to the drain pipe (10) via a pipe joint (14), and the two can rotate relative to each other. Several water spray holes (13) are evenly distributed on the water spray pipe (11).

6. The temperature-controlled water circulation device for raising and breeding giant freshwater prawns according to claim 5, characterized in that: The water spray hole (13) is an elliptical flat hole, and the angle between the center of the water spray hole (13) and the center of the bottom of the water spray pipe (11) is 50-60°.

7. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 4, characterized in that: The water spray pipe (11) is mounted above the water surface of the seedling pond (17) by multiple supports, with a distance between it and the water surface ranging from 50 to 150 mm.

8. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 4, characterized in that: The end of the water spray pipe (11) is provided with a plug (15).

9. The temperature-controlled water circulation device for raising and culturing giant freshwater prawns according to claim 4, characterized in that: The seedling pond (17) is equipped with a filter box (7), and the submersible pump (12) is placed inside the filter box (7).

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