A constant-temperature incubation system for locust seedlings

Abstract

The utility model relates to aquatic product breeding equipment technical field, concretely relates to a kind of leech seedling constant-temperature cultivation system, including cultivation tank, heating unit, heat preservation layer and temperature control module;Cultivation tank is used to accommodate water and leech seedling;Heating unit includes heating pipe and uniform heat plate that are pasted to heating pipe and are immersed in water body in cultivation tank;Heat preservation layer is coated in the outer wall of cultivation tank;Temperature control module includes temperature sensor distributed in multiple positions in cultivation tank and PID controller electrically connected with heating pipe and temperature sensor.The utility model is to solve the problem of low heat transfer efficiency and uneven temperature distribution when artificial temperature control is used for leech breeding.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture equipment technology, specifically to a constant temperature cultivation system for leech seedlings. Background Technology

[0002] In leech farming, low overwintering survival rate is a key issue restricting large-scale production. Current technologies mainly rely on natural overwintering in breeding ponds or artificial temperature control in steel-framed greenhouses, but these have significant drawbacks:

[0003] 1. Natural overwintering: Leeches are greatly affected by external climate fluctuations, and extreme low temperatures can easily lead to large-scale mortality.

[0004] 2. Artificial temperature control: For example, the patent with announcement number CN220458321U discloses a leech cultivation tank with controllable water temperature. By installing an electric heating blanket in the interlayer between the cultivation tank and graphene, and relying on the heat conduction of graphene, the water temperature can be regulated. However, since the heat needs to penetrate through multiple interfaces to be transferred to the water, this structure is prone to uneven heat distribution due to poor material contact, uneven thickness, or differences in thermal resistance. This can result in local water temperatures that are too high or too low in the cultivation tank.

[0005] Leeches are extremely sensitive to temperature changes; fluctuations in water temperature exceeding ±1°C can trigger stress responses, inhibiting growth and even leading to death. Furthermore, indirect heating methods have low thermal efficiency, with a significant amount of energy dissipated in non-target areas, making it difficult to maintain a precise, constant temperature environment. Therefore, a temperature control system capable of achieving efficient and uniform heat transfer is urgently needed. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a constant temperature cultivation system for leech seedlings to solve the problems of low heat transfer efficiency and uneven temperature distribution when artificially controlling the temperature for leech farming.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A constant-temperature cultivation system for leech seedlings includes a cultivation tank, a heating unit, an insulation layer, and a temperature control module. The cultivation tank is used to contain water and leech seedlings. The heating unit includes a heating pipe placed in the cultivation tank and immersed in the water, and a heat-dissipating plate attached to the heating pipe. The insulation layer covers the outer wall of the cultivation tank. The temperature control module includes temperature sensors distributed at multiple locations within the cultivation tank and a PID controller electrically connected to the heating pipe and the temperature sensors.

[0009] As a further embodiment of this utility model, it also includes a circulation unit, which includes a tangential water inlet tangentially connected to the bottom of the cultivation tank and a circulation pump connected to the tangential water inlet.

[0010] As a further embodiment of this utility model, the circulation unit further includes a dissolved oxygen sensor and a dissolved oxygen sensor installed in the cultivation tank, wherein the dissolved oxygen sensor is electrically connected to the nano-aeration disc.

[0011] As a further improvement of this utility model, the heating tube is covered with a food-grade silicone layer and is sealed by a waterproof junction box.

[0012] As a further improvement of this utility model: the bottom of the cultivation tank is provided with a conical sedimentation tank that connects the inside and outside of the cultivation tank, and an automatic drain valve is installed at the bottom of the conical sedimentation tank.

[0013] As a further embodiment of this utility model: the heat equalizing plate is an aluminum plate that covers the bottom of the cultivation tank and is in close contact with the bottom surface of the heating tube.

[0014] By adopting the above technical solution, this utility model will have the following beneficial effects:

[0015] 1. Highly efficient and uniform heating: The heating tube is directly immersed in the water, and combined with the heat distribution plate attached to its bottom, the heat is quickly diffused to the entire cultivation tank, completely eliminating local hot and cold zones; the heat distribution plate covers the bottom of the tank, converting the point heat source into a surface heat source, significantly improving the heat conduction efficiency.

[0016] 2. Precise temperature maintenance: Multi-point temperature sensors monitor the water temperature in different areas in real time, and the heating power is dynamically adjusted by a PID controller to ensure that the water temperature is stable within the target range; this overcomes the thermal lag of traditional indirect heating mode and avoids the stress impact of water temperature fluctuations on leech seedlings.

[0017] 3. High efficiency in heat utilization: The outer wall of the cultivation tank is covered with an insulation layer, which greatly reduces heat loss and reduces ineffective energy consumption; the direct heating method avoids heat dissipation in the multi-layer medium, making more efficient use of energy.

[0018] 4. Improved system reliability: The heat spreader and heating tube are tightly fitted to ensure long-term heat conduction stability; multi-point monitoring and intelligent control are combined to prevent biological damage caused by temperature runaway.

[0019] Compared with existing technologies, this system, with direct heating, uniform heat diffusion, and intelligent temperature control as its core, solves the problems of low heat transfer efficiency and uneven temperature distribution when artificially controlling the temperature for leech farming. It provides a continuous and stable growth environment for leech seedlings, significantly improving overwintering survival rate and farming efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a top view of the leech seedling constant temperature cultivation system described in this embodiment of the utility model.

[0022] Figure 2 for Figure 1 A perspective view of the cultivation tank of the leech seedling constant temperature cultivation system described in the embodiment;

[0023] Figure 3 for Figure 1 A front view of the cultivation tank of the leech seedling constant temperature cultivation system described in the embodiment;

[0024] Figure 4 for Figure 1 Left view of the cultivation tank of the leech seedling constant temperature cultivation system described in the embodiment.

[0025] The correspondence between the labels and component names in the attached figures is as follows:

[0026] 1. Cultivation tank; 2. Heating unit; 21. Heating tube; 22. Heat equalizing plate; 23. Waterproof junction box; 3. Insulation layer; 4. Temperature control module; 41. Temperature sensor; 42. PID controller; 5. Circulation unit; 51. Tangential inlet; 52. Circulation pump; 53. Dissolved oxygen sensor; 54. Nano aeration disc; 6. Conical sedimentation tank; 61. Automatic drain valve. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the following description is to be considered exemplary in nature and not restrictive.

[0028] Please refer to Figure 1-4 In one embodiment of the leech seedling constant temperature cultivation system provided by this utility model, the leech seedling constant temperature cultivation system includes a cultivation tank 1, a heating unit 2, a heat preservation layer 3, and a temperature control module 4.

[0029] The cultivation tank 1 is made of fiberglass (FRP) and has dimensions of 2000mm×1000mm×500mm (length×width×height). The outer wall of the cultivation tank 1 is covered with a 30mm thick polyurethane foam insulation layer 3.

[0030] The heating unit 2 includes a heating tube 21 and a heat equalizing plate 22. The heating tube 21 is meandering and horizontally immersed in the water of the cultivation tank 1. The heating tube 21 is made of stainless steel and has a power of 3kW. Its bottom is attached to the heat equalizing plate 22. The surface of the heating tube 21 is covered with a 2mm thick food-grade silicone layer, which is not only insulating but also has a low thermal conductivity (approximately 0.2 W / m·K), limiting the surface temperature of the heating tube 21 to ≤50℃ and preventing direct contact that could scald the leech seedlings (critical scalding temperature >60℃). The wires of the heating tube 21 are sealed through an IP68-rated waterproof junction box 23 to ensure electrical safety. The heat equalizing plate 22 is made of aluminum and measures 1900mm × 900mm × 5mm (length × width × height). It covers 95% of the bottom area of ​​the cultivation tank 1 and is in direct contact with the water. This allows for rapid heat dissipation, avoiding localized high temperatures, and bypassing the low thermal conductivity limitation of the silicone layer. It should be noted that the silicone layer only covers the non-contact surfaces (side walls and top) of the heating tube 21 and the heat exchange plate 22, and does not affect the core heat transfer path (heating tube 21 → heat exchange plate 22).

[0031] The temperature control module 4 includes five PT1000 temperature sensors 41 and a PID controller 42. The five PT1000 temperature sensors 41 are distributed at the four corners and the center of the cultivation tank 1 (50mm from the bottom of the tank). The PID controller 42 is installed outside the cultivation tank 1 and electrically connected to the heating tube 21 and the temperature sensors 41. The preset temperature of the PID controller 42 is 20±0.5℃ during the seedling stage and 25±0.5℃ during the growth stage.

[0032] In this embodiment, the temperature sensor 41 monitors the water temperature in real time. If the temperature is lower than the set value, the PID controller 42 starts the heating tube 21. The heat is evenly diffused through the heat distribution plate 22, so that the temperature difference of the water in the cultivation tank 1 is ≤0.5℃. At the same time, the heat insulation layer 3 reduces heat loss and reduces energy consumption by 40%.

[0033] Furthermore, the leech seedling constant temperature cultivation system of this embodiment also includes a circulation unit 5, which includes a tangential inlet 51 and a circulation pump 52. The tangential inlet 51 has a diameter of 50 mm and is tangentially connected to the outer periphery of the bottom of the cultivation tank 1 at a tangential angle of 15°~30°. The circulation pump 52 is installed outside the cultivation tank 1, and the outlet of the circulation pump 52 is connected to the bottom of the cultivation tank 1 through the tangential inlet 51 via a pipe. The direction of the water flow injected into the bottom of the cultivation tank 1 is tangential to the tank wall. The injected water flows along the tank wall due to inertia, causing the surrounding water to rotate and forming a horizontal vortex flow to avoid dead water areas.

[0034] Furthermore, the aforementioned circulation unit 5 also includes a dissolved oxygen sensor 53 and two nano-aeration discs 54. The dissolved oxygen sensor 53 is installed on the side wall of the cultivation tank 1 (300mm deep), and the two nano-aeration discs 54 are respectively installed on both sides of the bottom wall of the cultivation tank 1. When the dissolved oxygen sensor 53 detects that the dissolved oxygen in the water in the cultivation tank 1 is <5mg / L, the nano-aeration discs 54 are automatically activated to aerate and increase oxygen.

[0035] Furthermore, in this embodiment, a conical sedimentation tank 6 (cone angle 60°) is fixedly connected to the bottom of the cultivation tank 1, connecting the inside and outside of the cultivation tank 1. The conical sedimentation tank 6 can collect impurities in the cultivation tank 1. An automatic drain valve 61 is installed at the bottom of the conical sedimentation tank 6. The automatic drain valve 61 is a mature and widely used industrial component, commonly found in water treatment systems, boilers, cooling towers, aquaculture circulating water systems, etc., used to periodically or as needed to discharge settled impurities. It is a standardized and universal device. The automatic drain valve 61 is set to open for 10 minutes at 00:00 every day to discharge sewage regularly and maintain water quality.

[0036] The workflow of this utility model is as follows:

[0037] 1. Maintain constant temperature

[0038] Temperature sensors 41 (distributed at the four corners and center of the cultivation tank 1) collect water temperature data in real time and transmit it to the PID controller 42. If the water temperature is lower than the preset target range (e.g., 20±0.5℃ for seedlings), the PID controller 42 activates the heating unit 2, causing the heating pipe 21, which is directly immersed in the water, to begin heating. The heat distribution plate 22 evenly diffuses the heat to the entire bottom of the tank, eliminating local temperature differences. The polyurethane insulation layer 3 on the outer wall of the cultivation tank 1 reduces heat loss, thus lowering the heat loss rate.

[0039] 2. Dissolved oxygen management

[0040] The circulating pump 52 injects water through the tangential inlet 51 at the bottom of the breeding tank 1, which pushes the water to form a vortex flow. The water flow is continuously renewed to ensure that dissolved oxygen is evenly distributed and to avoid dead water areas. At the same time, it promotes the collection of uneaten food and excrement to the center of the cone-shaped sedimentation tank 6, so as to avoid impurities from being stuck in the corners.

[0041] The dissolved oxygen sensor 53 monitors the oxygen content of the water. If it is below the threshold (e.g., <5mg / L), the nano aeration disc 54 is automatically activated to release microbubbles to increase oxygen. The oxygenation intensity is dynamically adjusted according to the dissolved oxygen data monitored by the dissolved oxygen sensor 53.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A constant-temperature cultivation system for leech seedlings, characterized in that, include: The cultivation tank (1) is used to hold water and leech seedlings; The heating unit (2) includes a heating pipe (21) placed in the cultivation tank (1) and immersed in water, and a heat equalization plate (22) attached to the heating pipe (21). The insulation layer (3) covers the outer wall of the incubation tank (1); the temperature control module (4) includes temperature sensors (41) distributed in multiple locations within the incubation tank (1) and a PID controller (42) electrically connected to the heating tube (21) and the temperature sensors (41).

2. The leech seedling constant temperature cultivation system according to claim 1, characterized in that, It also includes a circulation unit (5), which includes a tangential inlet (51) tangentially connected to the bottom of the cultivation tank (1) and a circulation pump (52) connected to the tangential inlet (51).

3. The leech seedling constant temperature cultivation system according to claim 2, characterized in that, The circulation unit (5) also includes a dissolved oxygen sensor (53) and a nano-aeration disc (54) installed in the cultivation tank (1), wherein the dissolved oxygen sensor (53) is electrically connected to the nano-aeration disc (54).

4. The leech seedling constant temperature cultivation system according to claim 1, characterized in that, The heating tube (21) is covered with a food-grade silicone layer and is sealed by a waterproof junction box (23).

5. The leech seedling constant temperature cultivation system according to claim 1, characterized in that, The bottom of the cultivation tank (1) is provided with a conical sedimentation tank (6) that connects the inside and outside of the cultivation tank (1), and an automatic drain valve (61) is installed at the bottom of the conical sedimentation tank (6).

6. The leech seedling constant temperature cultivation system according to claim 1, characterized in that, The heat equalization plate (22) is an aluminum plate that covers the bottom of the cultivation tank (1) and is in close contact with the bottom surface of the heating tube (21).

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