Air-cooled double-circulation refrigerator operation control system and refrigerator

Abstract

The invention relates to the field of refrigerator control, and particularly discloses an air-cooled double-circulation refrigerator operation control system and a refrigerator. The temperature in the refrigerator is monitored in real time through a temperature sensor network, and an evaporation fan is started when the temperature is higher than a set temperature upper limit; in the refrigeration process, the evaporation fan regulates and controls the rotating speed in sections according to the temperature difference change between the current temperature and the set temperature, and energy conservation and noise reduction are achieved; when non-uniform temperature or high-temperature invasion is detected, the micro fan is triggered; based on the area temperature difference of the non-uniform-temperature area or the temperature rise rate of the high-temperature area and in combination with the object stacking height, the air direction, air volume and air speed of the micro fan are analyzed, and an air outlet array of the micro fan is adjusted; and when the temperature difference is eliminated, the micro fan exits, and refrigeration is independently maintained by the evaporation fan. The problems that a traditional refrigerator is uneven in temperature distribution, large in noise, high in energy consumption and the like are effectively solved, efficient, mute and intelligent double-circulation refrigeration control is achieved, and the refrigerator is suitable for wide application scenes of large-volume air cooling refrigerators.

Description

Technical Field

[0001] This invention relates to the field of freezer control, and specifically to a dual-cycle air-cooled freezer operation control system and the freezer itself. Background Technology

[0002] With the improvement of living standards and the growth of commercial refrigeration demand, air-cooled freezers are increasingly widely used in food storage, pharmaceutical refrigeration, and other fields. Traditional air-cooled freezers typically rely on a single evaporator fan to drive air circulation, delivering cold air to various areas inside the freezer through air ducts. However, in large-capacity freezers, a single fan often has limited airflow, making it difficult to achieve uniform temperature distribution. In particular, corners far from the evaporator and near the door are prone to forming cooling dead zones, resulting in locally higher temperatures and failing to meet the requirements of certain storage scenarios with high temperature uniformity.

[0003] To address these issues, existing technologies attempt to improve circulation by increasing fan airflow or adding auxiliary air ducts. However, this often leads to increased noise, higher energy consumption, and reduced usable volume. For example, Chinese Patent CN110057148A discloses an air-cooled freezer with an air outlet duct on the door. While this improves temperature distribution to some extent, it still relies on a single fan and cannot fundamentally solve the problems of localized high temperatures and heat intrusion, especially under frequent door opening or high-load conditions.

[0004] Therefore, there is an urgent need for an air-cooled circulation control system that can achieve rapid, uniform, and intelligent temperature control within the cabinet while ensuring low noise and low energy consumption. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes an air-cooled dual-cycle freezer operation control system and a freezer, enabling the control of the freezer.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: Firstly, the present invention provides an air-cooled dual-cycle freezer operation control system, including: a main fan start module: when the temperature sensor detects that the temperature inside the freezer is higher than the set upper temperature limit and the temperature exceeds the limit for a longer period than the set time threshold, the refrigeration unit and the evaporator fan are started.

[0007] Main fan operation control module: During the cooling process, it sequentially enters multiple operating stages based on the temperature difference between the current temperature inside the cabinet and the set temperature, and dynamically adjusts the evaporator fan according to the speed parameters corresponding to each operating stage.

[0008] Auxiliary fan trigger module: When uneven temperature or high temperature intrusion is detected inside the cabinet, the micro fan and evaporator fan are triggered to run simultaneously.

[0009] Auxiliary fan control module: acquires the location of temperature uneven areas and the temperature difference between areas or the location and temperature rise rate of high-temperature areas, and analyzes the wind direction, air volume and wind speed of the micro fan in combination with the stacking height of objects in the cabinet, and controls the air outlet array of the micro fan.

[0010] Auxiliary fan shutdown module: When the temperature difference in the uneven temperature area is eliminated and the temperature inside the cabinet drops to the set temperature, the micro fan is controlled to stop running, and the evaporator fan alone maintains the cooling.

[0011] Secondly, the present invention also provides a freezer, the freezer including the air-cooled dual-cycle freezer operation control system according to the present invention.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention forms a dual circulation mechanism with clear primary and secondary functions and relay air supply through the coordinated work of the evaporator fan and the micro fan, ensuring that the cold air can effectively cover the dead corners of traditional refrigeration and significantly improve the temperature uniformity inside the cabinet.

[0013] 2. In this invention, the main fan dynamically switches between operating stages based on the real-time temperature difference, such as the powerful cooling stage, the approach adjustment stage, the constant temperature maintenance stage, and the dormancy stage, which significantly reduces energy consumption and operating noise while ensuring the cooling effect.

[0014] 3. This invention intelligently triggers and regulates the micro fan by judging multiple factors such as regional temperature difference and temperature rise rate, which can quickly suppress high temperature intrusion and local overheating, and improve the system's adaptability under complex working conditions.

[0015] 4. This invention combines monocular vision and structured light technology to identify the stacking shape and height of items inside the cabinet in real time, and dynamically adjusts the wind speed and direction of the micro fan to ensure accurate and effective air delivery. Attached Figure Description

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a system module connection diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the refrigerator structure of the present invention.

[0019] Figure 3 This is a flowchart of the dynamic control process of the evaporator fan according to the present invention.

[0020] Figure 4 This is a schematic diagram of the overall system workflow of the present invention.

[0021] Reference numerals: 1. Evaporator fan; 2. Miniature fan; 3. Air inlet; 4. Air outlet array. Detailed Implementation

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] Please see Figure 1 and Figure 4 As shown, the first aspect of the present invention provides an air-cooled dual-cycle freezer operation control system, including a main fan start module, a main fan operation control module, an auxiliary fan trigger module, an auxiliary fan regulation module, and an auxiliary fan exit module.

[0024] The main fan operation control module is connected to the main fan start module and the auxiliary fan trigger module, respectively, and the auxiliary fan regulation module is connected to the auxiliary fan trigger module and the auxiliary fan exit module, respectively.

[0025] The main fan start module starts the refrigeration unit and evaporator fan when the temperature sensor detects that the temperature inside the cabinet is higher than the set upper temperature limit and the time the temperature exceeds the limit is longer than the set time threshold.

[0026] Furthermore, the specific working process of the main fan start-up module is as follows: the inner side wall area of ​​the cabinet is divided into several sub-areas in a grid pattern, temperature sensors are deployed at the center point of each sub-area to form a cabinet temperature sensor network, and the temperature at each point is acquired in real time.

[0027] Calculate the upper and lower limits of the set temperature based on the freezer's set temperature and the preset allowable temperature fluctuation range.

[0028] When the temperature at a certain point in the cabinet temperature sensor network exceeds the set upper limit, a timer is triggered, and when the time the temperature exceeds the limit exceeds the set threshold, the refrigeration unit and evaporator fan are started.

[0029] It should be noted that the cabinet temperature sensor network is connected to the main control unit of the freezer via wireless communication, thereby enabling data transmission and exchange. The temperature sensor uses an NTC thermistor, which is suitable for the temperature range required for food storage and offers high accuracy, low cost, compact size, and fast response.

[0030] It should be noted that the allowable temperature fluctuation range is preset according to the preservation or freezing process requirements of the stored items. This range is usually determined based on the optimal storage temperature characteristics of the items, industry standards, or relevant technical specifications, and is stored as a fixed parameter in the memory of the freezer's main control unit, providing a benchmark for calculating the upper and lower temperature limits.

[0031] It should be noted that the temperature over-limit duration threshold is obtained through experimental calibration based on the freezer's volume, the performance of the refrigeration unit, and the heat load characteristics. This threshold aims to avoid frequent start-ups and shutdowns of the unit due to normal disturbances such as brief door openings. Its specific value is optimized and preset as a system constant in the control logic to ensure the accuracy of the judgment and the stability of the system.

[0032] It should be noted that by setting a threshold for the duration of temperature exceeding the limit, the system can effectively distinguish between short-term temperature fluctuations and continuous abnormal temperature rises. This mechanism avoids frequent start-stop of the compressor and fan caused by instantaneous temperature changes, effectively preventing misjudgments.

[0033] It should be noted that the refrigeration unit of the freezer consists of a compressor, a condenser, a capillary tube, and an evaporator, which are connected by pipes to form a closed loop system filled with refrigerant. The entire working process of the refrigeration unit is as follows: the compressor drives the refrigerant to flow, releases heat at the condenser, reduces pressure through the capillary tube, absorbs heat from inside the freezer at the evaporator, and finally returns to the compressor to start a new cycle.

[0034] It should be noted that, as Figure 2 As shown, the freezer in this invention is equipped with two fans: an evaporator fan located on one side of the bottom of the cabinet, and a miniature fan located on the cover. The evaporator fan forces airflow through the evaporator to remove cold air, and then delivers the cooled air to various areas inside the cabinet, achieving efficient forced convection heat exchange. The miniature fan draws in cold air from around the evaporator through the air inlet and directs the airflow to designated areas through an array of air outlets, thus providing air delivery relay for the evaporator fan and ensuring that cold air can effectively reach locations away from the evaporator. The evaporator fan and the miniature fan each correspond to two independent air duct structures, working together to achieve a dual-drive circulating air delivery mechanism.

[0035] It should be noted that the evaporator fan, as the main circulating power unit, always operates at its core. Based on the overall temperature deviation inside the cabinet, it intelligently switches between four stages: powerful cooling, approach regulation, constant temperature maintenance, and dormancy, responsible for establishing and maintaining a basic low-temperature environment inside the cabinet. When localized temperature unevenness or high-temperature intrusion occurs that the evaporator fan's own circulation cannot resolve, the micro fan immediately starts, directing airflow to the high-temperature dead zone to assist in temperature uniformity control. Once the temperature in that area returns to normal, the micro fan automatically shuts down, and the system continues to rely solely on the evaporator fan for continuous cooling.

[0036] During the cooling process, the main fan operation control module sequentially enters multiple operation stages based on the temperature difference between the current temperature inside the cabinet and the set temperature, and dynamically adjusts the evaporator fan according to the speed parameters corresponding to each operation stage.

[0037] Further, see Figure 3 As shown, the specific working process of the main fan operation control module is as follows: during the cooling process, the current temperature inside the cabinet is monitored in real time and compared with the set temperature to obtain the dynamic temperature difference, and the evaporator fan is made to enter different operating stages according to the threshold range of the temperature difference; wherein: when the dynamic temperature difference is greater than the first set threshold, the strong cooling stage is entered, and the speed parameters corresponding to this stage in the database are called to control the evaporator fan to run at high speed.

[0038] When the dynamic temperature difference is greater than the second set threshold and less than or equal to the first set threshold, the process enters the approach adjustment stage and calls the corresponding speed parameter in the database to control the evaporator fan to run at medium speed.

[0039] When the current temperature reaches the set temperature, the system enters the constant temperature maintenance stage and calls the corresponding speed parameters in the database to control the evaporator fan to run at low speed.

[0040] When the current temperature drops to the lower limit of the set temperature, it enters the sleep stage, shuts down the refrigeration unit and the evaporator fan, and continues to operate in this cycle.

[0041] It should be noted that the current temperature inside the cabinet refers to the temperature at the highest point in the cabinet's temperature sensor network.

[0042] It should be noted that the first and second set temperature difference thresholds are determined through experimental calibration and optimization based on the refrigeration performance, heat load characteristics, and target temperature control accuracy of the freezer. Specifically, the relationship between the rate of temperature drop inside the freezer and the energy consumption of the fan is tested under different operating conditions. A critical temperature difference point that balances cooling efficiency and operational stability is selected as the threshold and pre-stored as a system parameter in the control database.

[0043] In one specific embodiment, when the unit is first turned on, a large amount of new food is placed inside at once, or the door is left open for an extended period, the temperature inside the cabinet is much higher than the set value. At this time, the dynamic temperature difference is greater than 5°C, and the evaporator fan enters the strong cooling stage. During this stage, the evaporator fan operates at its rated speed and provides maximum airflow to achieve rapid cooling. As the temperature gradually approaches the set value and the temperature difference decreases, the dynamic temperature difference is between 1°C and 5°C. The evaporator fan then enters the approach adjustment stage, during which the evaporator fan operates at 50% to 70% of its rated speed. By reducing the fan speed and airflow, the temperature can be kept stable while avoiding excessive moisture removal from the food by large airflow, and it is also more energy-efficient and quieter. When the temperature reaches the set temperature, i.e., the dynamic temperature difference is zero, the unit enters the constant temperature maintenance stage. During this stage, the evaporator fan operates at 20% to 30% of its rated speed or intermittently to maintain weak air circulation, eliminate temperature stratification caused by stagnant air, and ensure temperature uniformity. When the temperature drops to the lower limit of the set temperature, the unit enters the sleep stage, and the refrigeration unit and evaporator fan are turned off.

[0044] In this embodiment, the main fan dynamically switches between operating stages based on the real-time temperature difference, such as a powerful cooling stage, a near-adjustment stage, a constant temperature maintenance stage, and a dormancy stage, thereby significantly reducing energy consumption and operating noise while ensuring the cooling effect.

[0045] When the auxiliary fan triggering module detects uneven temperature inside the cabinet or high temperature intrusion, it triggers the micro fan and evaporator fan to run simultaneously.

[0046] Furthermore, the specific working process of detecting uneven temperature inside the cabinet in the auxiliary fan trigger module is as follows: the dead zone area of ​​refrigeration inside the cabinet is delineated according to the historical operating data of the freezer, and several measuring points with temperature sensors are evenly distributed in the area.

[0047] The temperature at each measuring point and the temperature at the main return air inlet of the evaporator fan are collected in real time, and the absolute value of the temperature difference between each measuring point and the main return air inlet is calculated to obtain the regional temperature difference.

[0048] If the temperature difference at a certain measuring point exceeds the set temperature difference threshold and the temperature difference exceeds the limit for a set duration, the temperature inside the cabinet is determined to be uneven, and the area to which the measuring point belongs is marked as an area with uneven temperature.

[0049] It should be noted that the aforementioned dead zone area refers to the key area inside the freezer that is far from the return air vent of the evaporator fan and is most prone to forming dead zones, such as the top corner and near the door.

[0050] It should be noted that the regional temperature difference threshold and the duration threshold for exceeding the regional temperature difference limit are set based on the maximum allowable thermal deviation between the cooling dead zone and the main return air vent, as well as the system's anti-disturbance requirements, through a comprehensive approach combining historical data statistics and experimental verification. Specifically, by analyzing the difference in temperature data under normal fluctuations and actual faults, the critical difference and the shortest duration that can effectively distinguish between short-term fluctuations and persistent temperature unevenness are determined, and this set of optimized values ​​are pre-stored as system parameters in the control unit.

[0051] In one specific embodiment, when the temperature difference between the areas is greater than 3°C and lasts for 2 minutes, it is determined that the temperature inside the cabinet is uneven, and the micro fan is activated.

[0052] Furthermore, the specific working process of detecting high temperature intrusion in the auxiliary fan trigger module is as follows: based on the temperature of each point in the cabinet temperature sensor network, the point with the highest temperature is identified and recorded as the high temperature point; the temperature difference between the high temperature point and the lowest temperature point is calculated and recorded as the temperature fluctuation.

[0053] If the temperature fluctuation exceeds the set temperature fluctuation threshold and the temperature fluctuation exceeds the limit for a set duration, it is determined that there is a high temperature intrusion, and the area where the high temperature point is located is marked as a high temperature area.

[0054] It should be noted that the temperature fluctuation threshold and the duration threshold for exceeding the limit are determined through experimental data and statistical analysis based on the requirements for the uniformity of the normal temperature field inside the cabinet and the characteristics of common disturbances such as thermal intrusion when the door is opened. Specifically, by simulating typical high-temperature intrusion scenarios, the temperature range and its duration distribution under normal fluctuations and abnormal intrusions are statistically analyzed. The critical range and the shortest duration that can effectively distinguish between short-term disturbances and continuous intrusions are selected, and this set of optimized values ​​are pre-stored in the control unit as system parameters.

[0055] In this embodiment, the present invention intelligently triggers and regulates the micro fan by judging multiple factors such as regional temperature difference and temperature rise rate, so as to quickly suppress high temperature intrusion and local overheating and improve the system's adaptability under complex working conditions.

[0056] The auxiliary fan control module acquires the location of the temperature uneven area and the temperature difference between the areas or the location and temperature rise rate of the high temperature area. Combined with the stacking height of objects inside the cabinet, it analyzes the wind direction, air volume and wind speed of the micro fan, and controls the air outlet array of the micro fan.

[0057] Furthermore, the specific working process of analyzing the wind direction, air volume and wind speed of the micro fan in the auxiliary fan control module is as follows: D1: Obtain the trigger condition type of the micro fan. If only uneven temperature is detected, then execute D2; if only high temperature intrusion is detected, then execute D3; if both uneven temperature and high temperature intrusion are detected, then execute D4.

[0058] D2: Obtain the location and temperature difference of the uneven temperature area.

[0059] The direction pointing towards the area of ​​uneven temperature is taken as the wind direction of the micro fan.

[0060] Based on the temperature difference in the area and the preset mapping relationship between the temperature difference in the area and the air volume, the air volume of the micro fan is determined.

[0061] The stacking height of the objects is determined based on their stacking posture inside the cabinet. The vertical distance from the object surface to the micro fan is calculated based on the stacking height as the airflow range. The wind speed of the micro fan is determined by combining the preset mapping relationship between airflow range and wind speed.

[0062] D3: Obtain the location and temperature rise rate of the high-temperature region.

[0063] The direction pointing towards the high-temperature area is taken as the wind direction of the micro fan.

[0064] Based on the temperature rise rate and the preset mapping relationship between the temperature rise rate and the air volume, the air volume of the micro fan is determined.

[0065] Analyze the wind speed of the miniature fan based on the height of the stacked objects.

[0066] D4: Determine whether the temperature uneven area and the high temperature area belong to the same area. If yes, determine the area as the target area and execute D5. If no, execute D6.

[0067] D5: The direction pointing towards the target area is taken as the wind direction of the micro fan.

[0068] The air volume corresponding to the regional temperature difference and temperature rise rate of the target area is obtained, and the target air volume is obtained by linear weighted fusion.

[0069] Analyze the wind speed of the miniature fan based on the height of the stacked objects.

[0070] D6: Based on the location of the high-temperature area, the rate of temperature rise, and the height of the object stacking, obtain the first set of data on the direction, volume, and speed of the micro fan according to step D3.

[0071] Based on the location of the temperature uneven area, the regional temperature difference, and the height of the object stacking, the second set of data on the wind direction, air volume, and wind speed of the micro fan is obtained according to step D2.

[0072] The first set of data and the second set of data are integrated to obtain the final data of wind direction, air volume and wind speed of the micro fan, wherein the execution order of the first set of data takes precedence over the second set of data.

[0073] It should be noted that the greater the temperature difference between zones, the greater the required airflow. The mapping relationship between zone temperature difference and airflow is positively correlated, aiming to provide sufficient airflow exchange to equalize the temperature. The mapping relationship between zone temperature difference and airflow is determined based on a combination of theoretical calculations, simulations, and experimental data. Specifically, through experimental methods, in a wind tunnel or actual cabinet, micro fans are controlled to operate at different airflow rates. The area temperature difference eliminated by different airflow rates is measured and recorded. After collecting enough data points, a curve can be plotted or piecewise linear fitting can be performed to determine the functional relationship between the two. This relationship is preset and stored in the system's control unit.

[0074] It should be noted that the miniature fan is built into the cover of the freezer, and the vertical distance from the surface of the object to the miniature fan is the same as the vertical distance from the surface of the object to the door of the freezer.

[0075] It should be noted that the greater the airflow range, the higher the required wind speed. The mapping relationship between airflow range and wind speed is positively correlated to ensure that the airflow has sufficient kinetic energy to overcome resistance and accurately reach and act on the target area. This mapping relationship is based on fluid mechanics principles and experiments. Specifically, the airflow range of the fan is directly related to the wind speed. After determining the height of the object stacking, according to fluid jet theory, a certain wind speed threshold needs to be met to ensure that the airflow can effectively cover the target distance. Through experiments, the effective range of the airflow under different wind speeds is measured, and a wind speed-range correspondence table or function is established. This relationship is preset and stored in the system's control unit.

[0076] It should be noted that a faster rate of temperature rise indicates a more urgent thermal crisis, requiring a larger and more rapid airflow intervention. The mapping relationship between the rate of temperature rise and airflow emphasizes a positive correlation for rapid response, aiming to quickly extinguish the heat source. This mapping relationship is set with a focus on dynamic response and suppression speed. Specifically, the rate of temperature rise reflects the degree of danger of a rapid temperature increase. By simulating high-temperature intrusion scenarios, the suppression effect on the rate of temperature rise under different airflow rates is tested. A mapping table or functional relationship between the rate of temperature rise and the required airflow is then established. This relationship is preset and stored in the system's control unit.

[0077] It should be noted that the methods for analyzing the wind speed of the micro fan in steps D3 and D5 are based on the same principle as those for analyzing the wind speed of the micro fan in step D2.

[0078] It should be noted that the weights of the air volume corresponding to the regional temperature difference and the rate of temperature rise can be set based on industry experience, or they can be obtained through a limited number of test data. For example, historical data on regional temperature difference and rate of temperature rise under different operating conditions can be collected first, then the correlation coefficients of the regional temperature difference and the rate of temperature rise on the required air volume can be calculated, regression analysis or principal component analysis can be used to determine the contribution of the two, and finally, after normalization, the contribution is converted into the corresponding weights and their sum is 1.

[0079] It should be noted that the priority of the execution order is based on considerations of safety risk levels. High-temperature intrusion represents a proactive and urgent thermal threat; if not handled promptly, it may lead to serious consequences such as equipment damage and fire. Temperature unevenness, on the other hand, is a static, optimization-oriented problem involving energy efficiency and uniform heat dissipation, but its short-term risk is lower. This invention prioritizes safety over optimization. Executing step D3 first to address the high-temperature intrusion allows for immediate emergency response to the most dangerous situation, preventing escalation. Then, step D2 is executed to address temperature unevenness, providing fine-tuning of the overall heat dissipation environment. This sequence ensures that the system can make the most reasonable and safest response under complex operating conditions.

[0080] Furthermore, the specific process for determining the stacking height of objects is as follows: S1: Using a monocular vision sensor and structured light projection equipment set on the top of the freezer, the objects stacked inside the freezer are scanned in three dimensions, their three-dimensional outlines are reconstructed, and a corresponding three-dimensional spatial model is constructed.

[0081] S2: Based on the three-dimensional spatial model, determine whether the upper surface of the object is flat. If it is flat, take the height value of any point on the upper surface as the stacking height of the object; otherwise, execute S3.

[0082] S3: Identify the number of protrusions on the upper surface. If there is a single protrusion, it is identified as the target protrusion. If there are multiple protrusions, the one with the largest volume is selected as the target protrusion.

[0083] S4: Calculate the ratio of the volume of the target protrusion to the total volume of the object. If the ratio is greater than a preset ratio threshold, the height of the target protrusion is taken as the object stacking height; otherwise, the height of the bottom of the target protrusion is taken as the object stacking height.

[0084] In this embodiment, the present invention combines monocular vision and structured light technology to identify the stacking shape and height of items inside the cabinet in real time, and dynamically adjust the wind speed and direction of the micro fan to ensure accurate and effective air delivery.

[0085] Furthermore, the specific working process of regulating the air outlet array of the micro fan in the auxiliary fan control module is as follows: based on the wind direction of the micro fan and combined with the predefined correspondence between each zone in the air outlet array and the wind direction, the working zone to be activated is determined.

[0086] Based on the air volume of the micro fan and the matching relationship between the preset air volume range and the number of air outlets, the number of air outlets to be activated in the working zone is determined.

[0087] The wind speed value of the activated air outlet is set according to the wind speed of the micro fan.

[0088] Based on the determined working zone, the number of air outlets activated within that zone, and the wind speed value of each air outlet, the air outlet array of the micro fan is comprehensively controlled.

[0089] It should be noted that the air duct structure design of the micro fan includes a centrally located air inlet and an air outlet array consisting of multiple evenly distributed air outlets.

[0090] It should be noted that the wind speed is adjusted by controlling the rotation speed of the micro fan; the higher the rotation speed, the greater the wind speed.

[0091] When the auxiliary fan shutdown module detects that the temperature difference in the uneven temperature area has been eliminated and the temperature inside the cabinet has dropped to the set temperature, it controls the micro fan to stop running, and the evaporator fan maintains the cooling alone.

[0092] Furthermore, the determination condition for eliminating temperature difference in the auxiliary fan exit module is: the regional temperature difference of the temperature uneven area is lower than the set threshold and the duration of this state reaches the set duration. The determination condition for the cabinet temperature to drop to the set temperature is: the temperature of all points in the temperature sensor network set in the cabinet is lower than or equal to the set temperature.

[0093] It should be noted that the high-temperature area disappears when the temperature inside the cabinet drops to the set temperature, that is, when the temperature at each point in the temperature sensor network drops to the set temperature.

[0094] It should be noted that the micro fan can independently start and stop and precisely regulate itself based on signals of uneven local temperature or high-temperature intrusion. This control method has the following advantages: First, the micro fan is only activated under short-term high-load conditions, while the evaporator fan operates independently for the vast majority of the time, effectively reducing the overall energy consumption of the system; Second, under normal operating conditions, the evaporator fan can maintain a low speed or even pause intermittently, thereby significantly reducing the noise level of the equipment and improving the user experience; Third, the micro fan only operates when necessary, greatly shortening the cumulative working time, which helps to extend its service life and improve system reliability.

[0095] In this embodiment, the present invention forms a dual circulation mechanism with clear primary and secondary functions and relay air delivery by working in synergy between the evaporator fan and the micro fan, ensuring that cold air can effectively cover the dead corners of traditional refrigeration and significantly improve the temperature uniformity inside the cabinet.

[0096] In this embodiment, the present invention introduces a dual-fan collaborative intelligent control mechanism, combined with a multi-sensor network and dynamic control strategy, to achieve a significant improvement in the operating efficiency and temperature uniformity of the freezer.

[0097] Secondly, the present invention also provides a freezer, the freezer including the air-cooled dual-cycle freezer operation control system according to the present invention.

[0098] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0099] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product.

[0100] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0101] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0102] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0103] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control system for a dual-cycle air-cooled freezer, characterized in that, include: Main fan start module: When the temperature sensor detects that the temperature inside the cabinet is higher than the set upper temperature limit and the time the temperature exceeds the limit is longer than the set time threshold, the cooling unit and evaporator fan are started. Main fan operation control module: During the cooling process, it sequentially enters multiple operation stages based on the temperature difference between the current temperature inside the cabinet and the set temperature, and dynamically adjusts the evaporator fan according to the speed parameters corresponding to each operation stage; Auxiliary fan triggering module: When uneven temperature or high temperature intrusion is detected inside the cabinet, the micro fan and evaporator fan are triggered to run simultaneously; Auxiliary fan control module: acquires the location and temperature difference of the temperature uneven area or the location and temperature rise rate of the high temperature area, and analyzes the wind direction, air volume and wind speed of the micro fan in combination with the stacking height of the objects in the cabinet, and controls the air outlet array of the micro fan. Auxiliary fan shutdown module: When the temperature difference in the uneven temperature area is eliminated and the temperature inside the cabinet drops to the set temperature, the micro fan is controlled to stop running, and the evaporator fan alone maintains the cooling.

2. The air-cooled dual-cycle freezer operation control system according to claim 1, characterized in that: The specific working process of the main fan start-up module is as follows: The inner sidewall area of ​​the cabinet is divided into several sub-regions by a grid pattern. Temperature sensors are deployed at the center point of each sub-region to form a cabinet temperature sensor network, and the temperature at each point is acquired in real time. Calculate the upper and lower limits of the set temperature based on the freezer's set temperature and the preset allowable temperature fluctuation range; When the temperature at a certain point in the cabinet temperature sensor network exceeds the set upper limit, a timer is triggered, and when the time the temperature exceeds the limit exceeds the set threshold, the refrigeration unit and evaporator fan are started.

3. The air-cooled dual-cycle freezer operation control system according to claim 1, characterized in that: The specific working process of the main fan operation control module is as follows: During the refrigeration process, the current temperature inside the cabinet is monitored in real time and compared with the set temperature to obtain a dynamic temperature difference. Based on the threshold range of this temperature difference, the evaporator fan enters different operating stages; among which: When the dynamic temperature difference exceeds the first set threshold, the system enters a powerful cooling phase and calls the corresponding speed parameters in the database to control the evaporator fan to run at high speed. When the dynamic temperature difference is greater than the second set threshold and less than or equal to the first set threshold, the process enters the approach adjustment stage and calls the corresponding speed parameter in the database to control the evaporator fan to run at medium speed. When the current temperature reaches the set temperature, the system enters the constant temperature maintenance stage and calls the corresponding speed parameters in the database to control the evaporator fan to run at low speed. When the current temperature drops to the lower limit of the set temperature, it enters the sleep stage, shuts down the refrigeration unit and the evaporator fan, and continues to operate in this cycle.

4. The air-cooled dual-cycle freezer operation control system according to claim 1, characterized in that: The specific working process of the auxiliary fan triggering module for detecting uneven temperature inside the cabinet is as follows: Based on the historical operating data of the freezer, the dead zone area of ​​refrigeration inside the freezer is delineated, and several measuring points with temperature sensors are evenly distributed in this area. The temperature at each measuring point and the temperature at the main return air inlet of the evaporator are collected in real time, and the absolute value of the temperature difference between each measuring point and the main return air inlet is calculated to obtain the regional temperature difference. If the temperature difference at a certain measuring point exceeds the set temperature difference threshold and the temperature difference exceeds the limit for a set duration, the temperature inside the cabinet is determined to be uneven, and the area to which the measuring point belongs is marked as an area with uneven temperature.

5. The air-cooled dual-cycle freezer operation control system according to claim 2, characterized in that: The specific working process of the auxiliary fan triggering module in detecting high-temperature intrusion is as follows: Based on the temperature of each point in the cabinet temperature sensor network, identify the point with the highest temperature and record it as the high temperature point; calculate the temperature difference between the high temperature point and the lowest temperature point and record it as the temperature fluctuation. If the temperature fluctuation exceeds the set temperature fluctuation threshold and the temperature fluctuation exceeds the limit for a set duration, it is determined that there is a high temperature intrusion, and the area where the high temperature point is located is marked as a high temperature area.

6. The air-cooled dual-cycle freezer operation control system according to claim 4, characterized in that: The specific working process of the auxiliary fan control module in analyzing the wind direction, air volume, and wind speed of the micro fan is as follows: D1: Obtain the trigger condition type of the micro fan. If only temperature unevenness is detected, execute D2; if only high temperature intrusion is detected, execute D3; if both temperature unevenness and high temperature intrusion are detected, execute D4. D2: Obtain the location and temperature difference of areas with uneven temperature; The direction pointing towards the area of ​​uneven temperature is taken as the wind direction of the micro fan; Based on the temperature difference in the area and the preset mapping relationship between the temperature difference in the area and the air volume, the air volume of the micro fan is determined. The stacking height of the objects is determined based on their stacking posture inside the cabinet. The vertical distance from the object surface to the micro fan is calculated based on the stacking height as the airflow range. The wind speed of the micro fan is determined by combining the preset mapping relationship between the airflow range and the wind speed. D3: Obtain the location and temperature rise rate of the high-temperature region; The direction pointing towards the high-temperature area will be used as the wind direction of the miniature fan; Based on the temperature rise rate and the preset mapping relationship between the temperature rise rate and the air volume, the air volume of the micro fan is determined. Analyze the wind speed of the miniature fan based on the height of the stacked objects; D4: Determine whether the temperature uneven area and the high temperature area belong to the same area. If yes, determine the area as the target area and execute D5. If no, execute D6. D5: The direction pointing towards the target area is taken as the wind direction of the micro fan; The air volume corresponding to the regional temperature difference and temperature rise rate of the target area is obtained, and the target air volume is obtained by linear weighted fusion. Analyze the wind speed of the miniature fan based on the height of the stacked objects; D6: Based on the location of the high-temperature area, the rate of temperature rise, and the height of the object stacking, obtain the first set of data on the direction, volume, and speed of the micro fan according to step D3; Based on the location of the temperature uneven area, the temperature difference in the area and the height of the object stacking, the second set of data on the wind direction, air volume and wind speed of the micro fan is obtained according to step D2. The first set of data and the second set of data are integrated to obtain the final data of wind direction, air volume and wind speed of the micro fan, wherein the execution order of the first set of data takes precedence over the second set of data.

7. The air-cooled dual-cycle freezer operation control system according to claim 6, characterized in that: The specific process for determining the stacking height of objects is as follows: S1: Using a monocular vision sensor and structured light projection equipment installed on the top of the freezer, the objects stacked inside the freezer are scanned in three dimensions, their three-dimensional outlines are reconstructed, and a corresponding three-dimensional spatial model is built. S2: Based on the three-dimensional space model, determine whether the upper surface of the object is flat. If it is flat, take the height value of any point on the upper surface as the stacking height of the object; otherwise, execute S3. S3: Identify the number of protrusions on the upper surface. If there is a single protrusion, it is identified as the target protrusion. If there are multiple protrusions, the one with the largest volume is selected as the target protrusion. S4: Calculate the ratio of the volume of the target protrusion to the total volume of the object. If the ratio is greater than a preset ratio threshold, the height of the target protrusion is taken as the object stacking height; otherwise, the height of the bottom of the target protrusion is taken as the object stacking height.

8. The air-cooled dual-cycle freezer operation control system according to claim 1, characterized in that: The specific working process of regulating the air outlet array of the micro fan in the auxiliary fan control module is as follows: Based on the wind direction of the micro fan and the predefined correspondence between each zone in the air outlet array and the wind direction, the working zone to be activated is determined. Based on the air volume of the micro fan and the matching relationship between the preset air volume range and the number of air outlets, the number of air outlets to be activated in the working zone is determined. Set the wind speed value of the activated air outlet according to the wind speed of the micro fan; Based on the determined working zone, the number of air outlets activated within that zone, and the wind speed value of each air outlet, the air outlet array of the micro fan is comprehensively controlled.

9. The air-cooled dual-cycle freezer operation control system according to claim 2, characterized in that: The condition for eliminating temperature difference in the auxiliary fan exit module is: the temperature difference in the temperature uneven area is lower than the set threshold and the duration of this state reaches the set duration. The condition for the cabinet temperature to drop to the set temperature is: the temperature of all points in the temperature sensor network set in the cabinet is lower than or equal to the set temperature.

10. A freezer, characterized in that: The freezer includes the air-cooled dual-cycle freezer operation control system according to any one of claims 1-9.

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