A temperature-controlled sealed box for transporting live aquatic products
By sensing the transportation conditions in real time and combining adaptive control with fluid dynamics and thermodynamics modules, the problems of high energy consumption, unstable water temperature, and fish damage in traditional live aquatic transport boxes are solved, achieving an efficient and stable live transport environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-01
- Publication Date
- 2026-06-30
Smart Images
Figure CN122296273A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aquaculture and cold chain logistics transportation technology, specifically a constant temperature sealed box for transporting live aquatic products. Background Technology
[0002] With the rapid iteration of the cross-regional cold chain logistics industry, a large number of live aquatic transport equipment that pursues high-density loading has appeared on the market. This long-distance transport equipment has very high requirements for the stability of the live survival environment. How to reduce equipment energy consumption while ensuring high survival rate is also a major challenge. Under the premise of the industry's pursuit of efficient logistics, whether intelligent steady-state control can be achieved has become a major highlight in the field of transport equipment. Traditional live animal transport box designs currently rely primarily on the following methods: built-in solid wave-proof baffles, passive insulation materials combined with ice packs, and constant-speed circulating oxygenation; However, solid partitions, passive insulation, and constant-speed circulation all have certain drawbacks. For example, solid partitions occupy the effective loading space inside the tank, and the fish are easily damaged by mechanical collisions with the partitions during violent shaking. Passive insulation is difficult to maintain a constant water temperature precisely, and thermal stratification can easily occur due to the stillness of the water. Constant-speed circulation requires setting a fixed operating power for the water pump, but a fixed power is difficult to adapt to dynamically changing transportation conditions, resulting in unnecessary energy waste on smooth sections of the road. Summary of the Invention
[0003] To solve the above-mentioned technical problems, the present invention provides a constant temperature sealed box for transporting live aquatic products. Specifically, the technical solution of the present invention includes: The enclosure basic construction module includes an enclosure base, a sealing cover plate, and a flow guide assembly suspended below the sealing cover plate; The real-time transportation condition sensing module is configured to collect acceleration data using an inertial measurement unit and obtain water temperature using a water temperature sensor. A fluid dynamics feature extraction module is configured to process the acceleration data to calculate the vertical vibration intensity value and the horizontal sway amplitude value. The thermodynamic and kinetic decoupling calculation module is configured to calculate the required rotational speed for heat exchange based on water temperature, and to calculate the required rotational speed for wave suppression based on the vertical vibration intensity value and the horizontal sway amplitude value. The adaptive execution and conflict arbitration module is configured to compare the required speed for wave suppression with the required speed for heat exchange: if the former is greater than the latter, it enters the high-frequency wave suppression mode; if the former is not greater than the latter, it enters the low-power cruise mode. The constant temperature and wave suppression coordinated control module is configured to control the submersible pump in the flow guide assembly to reach the required speed for wave suppression in the high frequency wave suppression mode to form a radial jet, and adjust the power of the semiconductor cooling chip connected to the heat exchange sleeve to maintain constant temperature.
[0004] Preferably, the flow guiding assembly in the enclosure basic construction module includes: A vertically arranged hollow guide pipe, the lower end of which is suspended above the bottom of the box base; The submersible pump is threadedly connected to the lower opening of the hollow guide pipe, with its inlet facing downwards. The heat exchange sleeve is embedded in the middle section of the hollow guide tube, and its inner surface is in direct contact with the water flowing through the hollow guide tube. The radial jet disk is fixedly connected to the top outlet of the hollow guide pipe and is horizontally positioned below the design water level line inside the box base.
[0005] Preferably, the radial jet disk includes an upper disk and a lower disk arranged coaxially. The upper disk and the lower disk are kept at a fixed distance by a support to form a horizontal annular jet orifice evenly distributed in the circumferential direction. The horizontal annular jet orifice is configured to spray the water flow cooled by the heat exchange tube horizontally in all directions.
[0006] Preferably, the heat exchange sleeve is made of aluminum alloy, and its top extends through the sealing cover and is pressed against the cold end face of the semiconductor refrigeration chip by thermally conductive silicone grease. The hot end face of the semiconductor refrigeration chip is connected to heat dissipation fins and an axial fan.
[0007] Preferably, the real-time transportation condition sensing module is used to: collect the acceleration data at a frequency of 200 Hz using the inertial measurement unit after the transportation vehicle starts; The fluid dynamics feature extraction module is used to: filter out high-frequency noise in the acceleration data, and extract the vertical vibration intensity value reflecting the degree of road bumps and the horizontal sway amplitude value reflecting the vehicle's inertial force.
[0008] Preferably, the thermodynamic and kinetic decoupling calculation module includes: The wave-suppressing fluid momentum calculation unit is used to determine, based on the vertical vibration intensity value, the fluid momentum required for the horizontal water film ejected through the radial jet disk to exert a suppressive effect on the water body below. The rotational speed mapping unit is used to execute a preset mapping relationship that follows positive correlation logic, so that when the vertical vibration intensity value increases, the target rotational speed of the submersible pump is increased, so as to reduce the local static pressure and increase the turbulent viscosity of the surface fluid by utilizing Bernoulli's principle.
[0009] Preferably, the adaptive execution and conflict arbitration module is configured as follows: When it is determined that the required speed for wave suppression is less than or equal to the required speed for heat exchange, the submersible pump is driven based on the required speed for heat exchange, and the semiconductor refrigeration chip is placed in a low-power maintenance mode. When it is determined that the required speed for wave suppression is greater than the required speed for heat exchange, the system immediately takes over control and enters the high-frequency wave suppression mode.
[0010] Preferably, the constant temperature and wave suppression coordinated control module is used for: When entering the high-frequency suppression mode, in order to prevent the water temperature from dropping too quickly due to excessive pump speed, the current of the semiconductor cooling chip is reduced or the semiconductor cooling chip is temporarily turned off while increasing the speed of the submersible pump, so as to use the water's own circulating heat capacity to buffer the pump heat.
[0011] Preferred options also include: The negative pressure oxygen supplementation module based on the Venturi effect has a vent hole at the center of the upper plate, which is connected to the air outside the sealing cover through a hose. When the submersible pump operates at high speed in the high-frequency wave suppression mode, the increased flow velocity at the horizontal annular jet port leads to a decrease in static pressure, thereby forming a negative pressure zone. This automatically draws in external air through the vent and breaks it into tiny bubbles, achieving simultaneous triggering of wave suppression and oxygenation functions.
[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This system achieves digital reconstruction and precise feature stripping of vehicle driving status through the collaborative work of the real-time transportation condition perception module and the thermodynamic dynamics decoupled calculation module. It can assign two completely different control objectives to a single actuator: maintaining survival temperature and suppressing water sloshing. Through the survival priority principle established by the adaptive execution and conflict arbitration modules, it can respond in milliseconds and output a high-momentum jet to suppress the liquid surface in severe turbulence scenarios, effectively avoiding physical damage to the fish caused by mechanical collisions. At the same time, it automatically reduces the frequency and enters a low-power cruise mode on smooth road sections, which significantly extends the battery life of the vehicle power supply and solves the problem of energy waste caused by the inability of the traditional constant speed cycle mode to adapt to dynamic road conditions. 2. This system replaces traditional physical partitions with active intervention of fluid dynamics by constructing a basic box-type building module and a flow guiding assembly. The radial jet disk converts the vertically rising pipe flow into a horizontally diffused high-momentum water film, and a virtual wave-damping layer is constructed using the concept of fluid stiffness. This invisible hydraulic pressure plate cuts off the surface wave transmission path and dissipates the impact energy through turbulence, preventing large water sloshing and leaving the valuable internal space entirely for live loading, achieving the optimal ratio of equipment volume to loading capacity. At the same time, the inverted layout of bottom suction and top discharge ensures full vertical mixing of the water, effectively eliminating the thermal stratification phenomenon commonly seen in static transportation. 3. This system greatly improves the heat exchange efficiency and electrical safety by using a low thermal resistance direct connection structure between the heat exchange tube and the semiconductor refrigeration chip, as well as a water-electricity separation design. This avoids secondary heat exchange losses and condensate failure risks caused by intermediate media. Through the nonlinear thermal compensation strategy introduced by the constant temperature and wave suppression collaborative control module, the system can accurately calculate the mechanical heat generation increment brought about by the increase in pump speed based on the speed sensitivity gradient. In the high-frequency wave suppression mode, the system can dynamically adjust the cooling power or use the heat capacity of the water body to buffer the flow, effectively solving the water temperature fluctuation problem caused by the pump heat effect under high energy consumption wave suppression conditions, and ensuring the constancy of the living environment. 4. This system cleverly utilizes the local negative pressure zone generated when fluid passes through the radial jet disk slit at high speed through a negative pressure oxygenation module based on the Venturi effect, achieving passive oxygenation without the need for an additional power source. By automatically drawing in external air and breaking it into micron-sized bubbles, the system achieves synchronous triggering of wave suppression and oxygenation functions. That is, it automatically provides sufficient oxygen at the moment when the vehicle is most bumpy and the oxygen consumption of the fish may increase. This passive synchronization mechanism not only simplifies the system structure but also significantly improves the survival rate of live animals in highly dynamic transportation scenarios. Attached Figure Description
[0013] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural diagram of the system of the present invention; Figure 2 This is a physical diagram of the internal structure of the constant temperature sealed box for transporting live aquatic products according to the present invention. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.
[0015] Example 1: Please see Figure 1 and Figure 2 A temperature-controlled sealed box for transporting live aquatic products, comprising: The enclosure basic construction module includes an enclosure base, a sealing cover, and a flow guide assembly suspended below the sealing cover; The real-time transportation condition sensing module is configured to collect acceleration data using an inertial measurement unit and obtain water temperature using a water temperature sensor. The fluid dynamics feature extraction module is configured to process acceleration data to calculate the vertical vibration intensity value and the horizontal sway amplitude value. The thermodynamic and kinetic decoupling calculation module is configured to calculate the required rotational speed for heat exchange based on water temperature, and to calculate the required rotational speed for wave suppression based on vertical vibration intensity and horizontal sway amplitude. The adaptive execution and conflict arbitration module is configured to compare the required speed for suppression and the required speed for heat exchange: if the former is greater than the latter, it enters the high-frequency suppression mode; if the former is not greater than the latter, it enters the low-power cruise mode. The constant temperature and wave suppression coordinated control module is configured to control the submersible pump in the flow guide assembly to reach the required speed for wave suppression in high frequency wave suppression mode to form a radial jet, and adjust the power of the semiconductor cooling chip connected to the heat exchange sleeve to maintain constant temperature.
[0016] This embodiment elaborates on the overall architecture and collaborative logic of the above system; the box base construction module adopts a double-layer structure design, with the inner layer made of food-grade polypropylene material to ensure biosafety, and the outer layer filled with polyurethane foam material to block external heat conduction, thereby constructing an insulated physical load-bearing environment; the real-time transportation condition perception module, as the sensory nerve of the system, uses a six-axis inertial measurement unit (IMU) to digitally reconstruct the vehicle's driving state and capture transient impacts and steady-state steering. The fluid dynamics feature extraction module cleans and strips features from the raw sensor data, providing accurate physical quantity inputs for subsequent decision-making. Based on this, the thermodynamics and kinetics decoupling calculation module assigns two distinct control objectives to the single actuator, the submersible pump, calculating the thermodynamic parameters required to maintain the survival temperature and the kinetic parameters required to suppress water sloshing. Furthermore, the adaptive execution and conflict arbitration module resolves conflicts in multi-objective control based on the survival priority principle, dynamically switching the system's operating mode. The constant temperature and wave suppression collaborative control module compensates for pump heat by adjusting the cooling power, ensuring the stability of water temperature under high energy consumption wave suppression conditions. In this embodiment, the traditional physical partition is replaced by active intervention of fluid dynamics, and a virtual wave suppression layer is constructed using the concept of fluid stiffness. In transportation scenarios where the vehicle experiences severe bumps, the system can respond in milliseconds and output a high-momentum jet to suppress the liquid surface, effectively avoiding physical damage to the fish caused by mechanical collisions. At the same time, it automatically reduces the frequency of operation on smooth road sections, significantly extending the battery life of the vehicle power supply.
[0017] The airflow assembly in the basic building module of the enclosure includes: A vertically installed hollow guide pipe, the lower end of which is suspended above the bottom of the box base; The submersible pump is connected to the lower opening of the hollow guide pipe by a thread, with its inlet facing downwards; The heat exchange sleeve is embedded in the middle section of the hollow guide tube, and its inner surface is in direct contact with the water flowing through the hollow guide tube. The radial jet plate is fixedly connected to the top outlet of the hollow guide pipe and is horizontally positioned below the design water level line inside the tank base.
[0018] This embodiment describes in detail the mechanical layout of the flow guide assembly and its fluid engineering significance; the vertically arranged hollow flow guide pipe serves as the main channel for fluid circulation, and its suspended lower end, combined with the arc-shaped structure of the tank bottom, aims to create a negative pressure zone at the bottom, effectively drawing in sediment and bottom cold water; the submersible pump adopts an inverted layout of bottom suction and top discharge, ensuring full mixing of the entire water body in the vertical direction and eliminating the thermal stratification phenomenon commonly seen in static transportation; The heat exchange sleeve is embedded in the middle section of the guide pipe. Since this position is directly above the pump outlet, the flow velocity is the highest and the turbulence is the greatest. According to the principle of convective heat transfer, the heat transfer coefficient is significantly improved. The radial jet plate is precisely set at a specific depth below the design water level, such as 3 to 5 centimeters underwater. The choice of this position is to balance the wave suppression effect and noise control, which can effectively suppress surface waves and avoid jet splashing. This embodiment constructs a compact chain-type processing unit that integrates power drive, heat exchange, and flow field shaping. In the space-constrained vehicle transportation scenario, this structure minimizes fluid resistance loss and leaves valuable internal space for live loading, achieving the optimal ratio of equipment volume to loading capacity.
[0019] The radial jet disk includes an upper plate and a lower plate arranged coaxially. The upper plate and the lower plate are kept at a fixed distance by a support to form a horizontal annular jet orifice that is evenly distributed along the circumference. The horizontal annular jet orifice is configured to spray water that has been cooled by the heat exchange tube horizontally in all directions.
[0020] This embodiment details the construction of the radial jet disk and the resulting flow field morphology. The upper and lower disks are maintained at a small, fixed distance, for example, 3 mm, by precision-machined support pillars, thus forming a 360-degree circumferential slit-type nozzle. Simultaneously, to ensure the compatibility of the mechanical structure parameters with the subsequent fluid control algorithm, the inner diameter of the inlet at the center connection between the upper and lower disks is clearly defined. In this embodiment, the value is 0.04 meters, which is directly related to the calculation of the jet inlet velocity; When cooled water flows into the narrow space from the guide pipe, the cross-sectional area of the flow channel contracts sharply, and according to the continuity equation, the fluid is forced to accelerate. The water is ejected from the annular jet nozzle at extremely high horizontal speed, forming a layer of outwardly expanding high-momentum water film below the water surface. This water film uses the surface tension and momentum transfer of the fluid to cut off the transmission path of surface waves. In this embodiment, the vertically rising pipe flow is converted into a horizontally spreading hydraulic pressure plate through the shaping of the physical structure. In the scenario where the transport box is subjected to lateral impact, this high-speed water flow acts like an invisible lid, pressing down on the lower water body and dissipating the energy of impacting the box wall through turbulence, thereby preventing the water body from swaying significantly.
[0021] The heat exchange sleeve is made of aluminum alloy. Its top extends through the sealing cover and is pressed against the cold end face of the semiconductor refrigeration chip by thermal grease. The hot end face of the semiconductor refrigeration chip is connected to heat dissipation fins and an axial fan.
[0022] This embodiment details the material selection and connection process of the heat exchange path; the heat exchange sleeve is made of aluminum alloy, which is intended to take advantage of its excellent thermal conductivity and lightweight characteristics. At the same time, the surface of the aluminum alloy is anodized to resist water corrosion; the top of the sleeve directly passes through the sealing cover plate into the dry area, and is pressed with the cold end face of the semiconductor refrigeration chip TEC through high thermal conductivity silicone grease, realizing the tube-chip direct connection. The TEC's hot end face connects the heat sink fins and axial fan, creating a heat dissipation channel to the external environment. This structural design places the electrical components on the upper surface of the sealed cover (dry area) and the water circuit on the lower surface (wet area). This embodiment achieves a strict water-electricity separation design, greatly improving the electrical safety of the system. In scenarios involving long-distance transportation and a lack of professional maintenance personnel, this low thermal resistance direct connection structure avoids secondary heat exchange losses of the intermediate medium, ensuring maximum cooling efficiency while reducing the risk of equipment failure caused by condensate short circuits.
[0023] The real-time transportation condition sensing module is used to: collect acceleration data at a frequency of 200 Hz using an inertial measurement unit after the transport vehicle starts. The fluid dynamics feature extraction module is used to: filter out high-frequency noise in acceleration data and extract vertical vibration intensity values that reflect the degree of road bumps and horizontal sway amplitude values that reflect the inertial force of vehicles.
[0024] This embodiment details the algorithm flow for signal acquisition and feature separation, focusing on correcting the indexing logic of the sliding window in real-time stream processing to meet code-level reproducibility requirements; Step 1: Data standardization and preprocessing; The raw register value RawLSB output by the inertial measurement unit (IMU) is converted into standard SI units by physical quantity mapping through a sensitivity coefficient transformation matrix, i.e. Assuming the IMU range is set to... Sensitivity LSB / g, then the conversion formula is:
[0025] To clarify, the constant 9.81 in the formula represents the standard gravitational acceleration. Its unit is In precise calculations, an approximate value of 9.80665 is taken; among which, Defined as an inertial measurement unit (IMU) in The raw register value output at any time is the least significant bit (LSB) value of the corresponding sensor range. Although it is represented in the form of a digital integer, it physically corresponds to a specific acceleration component. Step Two: Dual-channel parallel filtering; The system is designed with two parallel digital filtering links: High-frequency noise filtering channel: A first-order recursive low-pass filter is used to process the data, and the output... The calculation formula is defined as follows:
[0026] in, Index of the current sampling time, filter coefficients The corresponding cutoff frequency is 80Hz; Quasi-static gravity separation channel: adopts a cutoff frequency of... A Hz IIR low-pass filter tracks the gravity vector in real time.
[0027] in, ; Here it is clarified that the above filter coefficients and All are based on the system sampling period and their respective target cutoff frequencies Discretization formula of first-order inertial element
[0028] The calculated theoretical values ensure the accurate reproduction of frequency domain characteristics; The above coefficients and The result is directly calculated from the aforementioned discretization formula. In this embodiment, the calculation result is used directly without introducing additional experimental calibration correction. The output of this step This refers to the gravity and long-period motion components at the current moment; Step 3: Real-time sliding window feature calculation; To eliminate ambiguity in the time dimension, the sampling parameters are clearly defined here: Based on the 200 Hz sampling frequency of the embodiment, the discrete sampling period is determined. Seconds; set the sliding window length accordingly. Thus, strictly corresponding to physical time seconds; here It must be a positive integer type, serving as the upper bound of the loop index in the programming implementation; a backtracking index logic is used to calculate the vertical vibration intensity value. With horizontal sway amplitude value , Here is the backtracking offset: Defined as the discrete-time index of the current moment, an integer. ; The backtracking step size index is an integer; it is satisfied during the initial stage of system startup. When necessary, a boundary handling strategy is adopted, such as zero-filling or waiting for the buffer to be filled before outputting valid data;
[0029]
[0030] The above formula is strictly defined based on the current time. Push forward The real-time calculation process for each sample resolves the ambiguity of the static summation index in the original description, ensuring the algorithm's executability in continuous data streams; it also clarifies that the calculated vertical vibration intensity value is... With horizontal sway amplitude value The physical unit for all of them is meters per square second, that is... The dimension definition is consistent with the acceleration unit at the input end, and serves as the physical reference for dimensionless processing of gravitational acceleration in the subsequent thermodynamic and dynamic decoupling calculation module.
[0031] The thermodynamics and kinetics decoupling calculation module includes: The wave-suppressing fluid momentum calculation unit is used to determine the fluid momentum required for the horizontal water film ejected through the radial jet disk to exert pressure on the water body below, based on the vertical vibration intensity value. The speed mapping unit is used to execute a preset mapping relationship that follows positive correlation logic, so that when the vertical vibration intensity value increases, the target speed of the submersible pump is increased, so as to reduce the local static pressure and increase the turbulent viscosity of the surface fluid by utilizing Bernoulli's principle.
[0032] This embodiment details the calculation logic and physical mapping relationship of the wave suppression parameters, and supplements the boundary constraints of the physical actuator; the wave suppression fluid momentum calculation unit uses a linear weighted model to calculate the required wave suppression jet thrust. Its unit is N:
[0033] in, N, N, here it is explicitly stated: formula terms and variables in and All units are , divided by The operation aims to convert it into a dimensionless gravitational acceleration multiple so that it can be compared with coefficients calibrated based on gravitational multiples. and Multiplication; coefficient , In essence, this is a conversion factor that transforms the dimensionless vibration intensity ratio into a force, representing the gain factor that converts the vibration intensity in the vertical and horizontal directions into the required thrust. Its physical unit is equivalent to... or ; This refers to the static resistance compensation force of the system; the above coefficients are empirical parameters obtained through physical calibration experiments on a shaking table for the 50-liter standard box model in this embodiment. and These represent the efficiency gains in the conversion of vibrational energy into fluid momentum in the vertical and horizontal directions, respectively. To overcome the minimum bias force required to overcome the static resistance of the pipeline; the speed mapping unit establishes an inverse solution model based on the fluid momentum theorem and the pump affinity law; target speed. The unit is RPM, and the calculation formula is as follows:
[0034] Parameter definition: , is again explicitly defined as the inner diameter of the central inlet of the radial jet disk, and is introduced here as a characteristic scale of the flow field; ; Here, the flow coefficient of the jet nozzle is defined, ranging from 0 to 1. It reflects the effective flow area loss rate caused by flow channel contraction when the actual fluid flows through the nozzle. It is used to characterize the ratio of the actual effective flow area to the geometric area when the fluid flows through the nozzle, reflecting the influence of flow contraction and local resistance on the flow rate. , Defined as the total effective cross-sectional area of the annular jet nozzle, its calculation formula is as follows:
[0035] in, The disk spacing is 3mm. This is defined here as the fluid slip compensation coefficient, with a value greater than 1, used to reflect the slip difference between the actual output flow rate of the pump and the theoretical Euler equation calculation value. The above flow coefficient... and slip coefficient All values are empirical calibration values determined by comparing fluid simulation and physical prototype experiments. These values are used to compensate for velocity lag losses when the impeller mechanically drives the water flow, ensuring that the calculated rotational speed can generate sufficient fluid momentum. To ensure that the calculation instructions do not exceed the hardware physical limits, a physical boundary saturation stage is introduced. The rated maximum rotational speed of the submersible pump is defined. RPM and minimum starting speed RPM; the final output to the arbitration module is the required speed for suppression. for:
[0036] This step ensures that, in the event of extreme road impacts... Values that are abnormally large, such as At the same time, the system will not output speed commands that would cause motor overload or damage, thus meeting the robustness requirements of the control system; simultaneously, the heat exchange requires a certain speed. The PI calculation logic still applies:
[0037] in, Defined as Temperature deviation at any given time, i.e., set temperature Compared with actual water temperature The difference; in order to match the thermal inertia model of the 50L standard box in this embodiment, the following settings are made: RPM, this value is consistent with the lower limit of the process output below, and serves as the zero-bias speed in heat exchange mode; set the proportional gain coefficient. RPM / C, Set the integral gain coefficient ; Its output is also limited by the process requirements. Within the RPM range.
[0038] The adaptive execution and conflict arbitration module is configured as follows: When the required speed for wave suppression is determined to be less than or equal to the required speed for heat exchange, the submersible pump is driven based on the required speed for heat exchange, and the semiconductor refrigeration chip is placed in a low-power maintenance mode. When it is determined that the required speed for wave suppression is greater than the required speed for heat exchange, the system immediately takes over control and enters the high-frequency wave suppression mode.
[0039] This embodiment details the arbitration strategy under multi-objective control conflict; the system compares and calculates the required speed for wave suppression in real time. Rotation speed required for heat exchange ; in response The system determines that the current state is one of stable transportation or dominated by heat load, and therefore... The submersible pump is driven by a reference; at this time, the semiconductor cooling chip enters a low-power sustaining mode, that is: the system forces the power compensation term, i.e., the feedforward, to zero, and relies only on the PID feedback term. Adjust the cooling capacity to compensate for heat leakage from the tank walls and maintain a constant water temperature, thus avoiding unnecessary energy consumption; In response to The system determines that it is currently in a state of severe turbulence, immediately takes over control, and forcibly enters the high-frequency wave suppression mode, with the submersible pump speed directly responding to the vibration intensity; This embodiment establishes a survival-first control hierarchy; in scenarios involving violent shaking that could cause physical damage to the fish, the system prioritizes wave suppression; while in scenarios involving smooth driving, the system automatically reverts to energy-saving temperature control mode, achieving intelligent allocation and management of limited onboard energy.
[0040] The constant temperature and wave suppression coordinated control module is used for: When entering the high-frequency suppression mode, in order to prevent the water temperature from dropping too quickly due to excessive pump speed, the current of the semiconductor cooling chip is reduced or the semiconductor cooling chip is temporarily turned off while increasing the submersible pump speed, so as to use the water's own circulating heat capacity to buffer the pump heat.
[0041] This embodiment details the thermal compensation strategy under high-frequency suppression conditions, focusing on correcting the nonlinear characteristics of the net cooling efficiency gain coefficient to conform to thermodynamic physical laws; the system operation follows the dynamic thermal balance equation:
[0042] Considering the heat generated by the submersible pump The effect of enhanced convective heat transfer coefficient The rates of change of the two with rotational speed are not consistent; therefore, the original constant... The net heat gain cannot be accurately described across the entire speed range; this embodiment corrects this by using a speed-based nonlinear lookup table function. The coefficient In a physical sense, it is defined as the net heat flux-speed sensitivity gradient, representing the change in net heat power of the system under a unit change in rotational speed, with units of... The engineering experience model it constructs aims to map the speed difference into an adjustment amount of cooling power; it mechanistically reflects the slope of the difference between the increase in mechanical heat generation due to the increase in pump speed and the increase in heat exchange efficiency due to the increase in flow rate at a specific operating point, thereby guiding the system to accurately calculate the direction and magnitude of power compensation required to maintain thermal balance; the control law is modified as follows:
[0043] Among them, variables Defined as the current real-time measured speed (RPM) of the submersible pump, the variable Defined as the calculated heat exchange required rotational speed; this formula is calculated... The overshoot of the speed caused by the suppression requirement was clearly quantified, and the cooling power was adjusted accordingly; among them, The unit is W / RPM, obtained through a system-level thermal balance calibration experiment conducted in a standard thermal insulation test chamber. This involves measuring the water temperature rise curves at different constant rotational speeds to inversely estimate the net heat power, which is then achieved through linear interpolation in the controller. Specifically, the calibration values are between the following key calibration points. The value is calculated through linear interpolation between two adjacent points; the key calibration points are as follows: RPM: At this time, enhanced heat exchange is dominant, and heat production is relatively low. RPM: To design the balance point RPM: The heat generation effect begins to significantly offset the heat transfer gain. RPM: At this point, the pump heat is extremely high, exceeding the heat exchange gain, and the cooling power needs to be increased instead, that is, the compensation term becomes negative. This nonlinear compensation strategy solves the problem of temperature runaway that may be caused by a single linear coefficient in the high speed range, that is, it prevents the water temperature from rising due to incorrect reduction of TEC power. Defined as a PID controller The initial value of the base cooling power command value calculated at each moment. Set to 0; the basic PID part remains unchanged, where Defined as the first The difference between the set temperature value and the actual temperature value at any given time:
[0044] parameter: .
[0045] Example 2: Also includes: The negative pressure oxygen supplementation module based on the Venturi effect has a vent hole at the center of the upper plate, which is connected to the air outside the sealing cover through a hose. When the submersible pump operates at high speed in high-frequency wave suppression mode, the increased flow velocity at the horizontal annular jet inlet leads to a decrease in static pressure, forming a negative pressure zone. This automatically draws in external air through the vent and breaks it into tiny bubbles, achieving simultaneous triggering of wave suppression and oxygenation functions.
[0046] This embodiment describes in detail the physical mechanism of fluid dynamic oxygenation; a vent is opened at the geometric center of the upper plate and connected to the outside atmosphere through a hose; when the submersible pump runs at high speed under vibration trigger, a large amount of water flows from the guide pipe into the narrow gap between the upper and lower plates. Since the flow channel cross section changes from vertical to horizontal and the center radius is extremely small, the fluid generates an extremely high radial velocity here. According to the Venturi effect, also known as Bernoulli's principle, the high flow velocity in the central region leads to a rapid decrease in static pressure. When the rotational speed exceeds a critical threshold, the central static pressure falls below atmospheric pressure, forming a negative pressure zone. Consequently, external air is automatically drawn in under the pressure difference and is pulverized into micron-sized bubbles under the shearing action of the high-speed water flow, which are then ejected outwards with the jet. This embodiment achieves passive synchronous triggering of wave suppression and oxygenation functions. To ensure that the formation of the negative pressure zone has reproducible engineering standards, a critical rotational speed threshold is further defined. The calculation basis and parameter sources are as follows: This threshold is derived from Bernoulli's equation and must satisfy the requirement that the pressure drop caused by the dynamic pressure at the jet center overcomes the hydrostatic pressure at the water depth; the derivation process is as follows: According to Bernoulli's equation, under ideal conditions where friction resistance is neglected, the critical condition for air intake is that the fluid dynamic head equals the hydrostatic head, that is:
[0047] Solve for the critical flow velocity In this mechanical structure, the tangential linear velocity of the fluid at the inlet of the jet disk is... Determined by the pump's rotational speed, its geometric relationship is defined as follows:
[0048] in, This is explicitly defined as the inner diameter of the central inlet of the radial jet plate, i.e., the inlet diameter of the flow channel at the connection between the upper and lower plates; in the physical prototype of this embodiment, this dimension is designed to be consistent with the inner diameter of the submersible pump outlet flange, i.e., the measured value is used. Meters; Combining the above two equations, we obtain the critical speed formula:
[0049] It should be noted that the above formula derivation is based on an ideal fluid model. In practical applications, the effects of pipeline flow resistance and the two-phase flow resistance after bubble generation must be considered. Parameter settings: The depth of the radial jet disk below the design water level is specifically the vertical distance from the upper surface of the radial jet disk to the still water surface, which is taken as 0.05 meters in this embodiment. In this algorithm, the water level is treated as a fixed nominal value, ignoring the impact of water level fluctuations caused by minor shaking during transportation. Pick Substituting the above parameters into the calculation yields... The system is configured with an engineering trigger threshold that includes a safety margin, meaning it will trigger the submersible pump at its measured speed (rpm) only if the measured speed of the submersible pump is detected. When the rpm is reached, it is determined that the oxygen supplementation function has been physically activated.
[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims
1. A temperature-controlled sealed box for transporting live aquatic products, characterized in that, include: The enclosure basic construction module includes an enclosure base, a sealing cover plate, and a flow guide assembly suspended below the sealing cover plate; The real-time transportation condition sensing module is configured to collect acceleration data using an inertial measurement unit and obtain water temperature using a water temperature sensor. A fluid dynamics feature extraction module is configured to process the acceleration data to calculate the vertical vibration intensity value and the horizontal sway amplitude value. The thermodynamic and kinetic decoupling calculation module is configured to calculate the required rotational speed for heat exchange based on water temperature, and to calculate the required rotational speed for wave suppression based on the vertical vibration intensity value and the horizontal sway amplitude value. The adaptive execution and conflict arbitration module is configured to compare the required speed for wave suppression with the required speed for heat exchange: if the former is greater than the latter, it enters the high-frequency wave suppression mode. If the former is not greater than the latter, enter low-power cruise mode; The constant temperature and wave suppression coordinated control module is configured to control the submersible pump in the flow guide assembly to reach the required speed for wave suppression in the high frequency wave suppression mode to form a radial jet, and adjust the power of the semiconductor cooling chip connected to the heat exchange sleeve to maintain constant temperature.
2. The constant temperature sealed box for transporting live aquatic products according to claim 1, characterized in that, The airflow guiding assembly in the basic building module of the enclosure includes: A vertically arranged hollow guide pipe, the lower end of which is suspended above the bottom of the box base; The submersible pump is threadedly connected to the lower opening of the hollow guide pipe, with its inlet facing downwards. The heat exchange sleeve is embedded in the middle section of the hollow guide tube, and its inner surface is in direct contact with the water flowing through the hollow guide tube. The radial jet disk is fixedly connected to the top outlet of the hollow guide pipe and is horizontally positioned below the design water level line inside the box base.
3. The constant temperature sealed box for transporting live aquatic products according to claim 2, characterized in that, The radial jet disk includes an upper disk and a lower disk arranged coaxially. The upper disk and the lower disk are kept at a fixed distance by a support to form a horizontal annular jet orifice that is evenly distributed along the circumference. The horizontal annular jet orifice is configured to spray water that has been cooled by the heat exchange tube horizontally in all directions.
4. A constant-temperature sealed box for transporting live aquatic products according to claim 3, characterized in that, The heat exchange sleeve is made of aluminum alloy, and its top extends through the sealing cover plate and is pressed against the cold end face of the semiconductor refrigeration chip by thermally conductive silicone grease. The hot end face of the semiconductor refrigeration chip is connected to heat dissipation fins and an axial fan.
5. A constant-temperature sealed box for transporting live aquatic products according to claim 1, characterized in that, The real-time transportation condition sensing module is used to: collect the acceleration data at a frequency of 200 Hz using the inertial measurement unit after the transportation vehicle starts. The fluid dynamics feature extraction module is used to: filter out high-frequency noise in the acceleration data, and extract the vertical vibration intensity value reflecting the degree of road bumps and the horizontal sway amplitude value reflecting the vehicle's inertial force.
6. A constant-temperature sealed box for transporting live aquatic products according to claim 2, characterized in that, The thermodynamic and kinetic decoupling calculation module includes: The wave-suppressing fluid momentum calculation unit is used to determine, based on the vertical vibration intensity value, the fluid momentum required for the horizontal water film ejected through the radial jet disk to exert a suppressive effect on the water body below. The rotational speed mapping unit is used to execute a preset mapping relationship that follows positive correlation logic, so that when the vertical vibration intensity value increases, the target rotational speed of the submersible pump is increased, so as to reduce the local static pressure and increase the turbulent viscosity of the surface fluid by utilizing Bernoulli's principle.
7. A constant-temperature sealed box for transporting live aquatic products according to claim 1, characterized in that, The adaptive execution and conflict arbitration module is configured as follows: When it is determined that the required speed for wave suppression is less than or equal to the required speed for heat exchange, the submersible pump is driven based on the required speed for heat exchange, and the semiconductor refrigeration chip is placed in a low-power maintenance mode. When it is determined that the required speed for wave suppression is greater than the required speed for heat exchange, the system immediately takes over control and enters the high-frequency wave suppression mode.
8. A constant-temperature sealed box for transporting live aquatic products according to claim 7, characterized in that, The constant temperature and wave suppression coordinated control module is used for: When entering the high-frequency suppression mode, in order to prevent the water temperature from dropping too quickly due to excessive pump speed, the current of the semiconductor cooling chip is reduced or the semiconductor cooling chip is temporarily turned off while increasing the speed of the submersible pump, so as to use the water's own circulating heat capacity to buffer the pump heat.
9. A constant-temperature sealed box for transporting live aquatic products according to claim 3, characterized in that, Also includes: A vent hole is provided at the center of the upper plate, and the vent hole is connected to the air outside the sealing cover through a hose; When the submersible pump operates at high speed in the high-frequency wave suppression mode, the increased flow velocity at the horizontal annular jet port leads to a decrease in static pressure, thereby forming a negative pressure zone. This automatically draws in external air through the vent and breaks it into tiny bubbles, achieving simultaneous triggering of wave suppression and oxygenation functions.