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

Abstract

The application relates to the field of refrigerator control, and particularly discloses a wind-cooled double-circulation refrigerator operation control system and a refrigerator. The application realizes real-time monitoring of the temperature in the refrigerator through a temperature sensor network and starts an evaporative fan when the temperature is higher than the upper limit of the set temperature; during the refrigeration process, the evaporative fan is controlled in sections according to the temperature difference between the current temperature and the set temperature, so that the rotation speed is changed, energy saving and noise reduction are realized; when uneven temperature or high-temperature invasion is detected, a micro fan is triggered; based on the regional temperature difference of the uneven temperature area or the temperature rise rate of the high-temperature area, combined with the height of the object stacking, the wind direction, the air volume and the air speed of the micro fan are analyzed and the air outlet array of the micro fan is adjusted; when the temperature difference is eliminated, the micro fan is withdrawn and the evaporative fan is used to maintain refrigeration alone. The application effectively solves the problems of uneven temperature distribution, high noise and high energy consumption of the traditional refrigerator, realizes efficient, silent and intelligent double-circulation refrigeration control, and is suitable for wide application scenarios of large-capacity wind-cooled refrigerators.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigerator control, and relates to a wind-cooled double-circulation refrigerator operation control system and a refrigerator. BACKGROUND

[0002] With the improvement of living standards and the growth of commercial refrigeration demand, the application of air-cooled refrigerators in food storage, medical refrigeration and other fields is becoming more and more widespread. Traditional air-cooled refrigerators usually rely on a single evaporative fan to drive air circulation, and cold air is transported to each area in the refrigerator through an air duct. However, in a large-capacity refrigerator, a single fan often has limited air volume, making it difficult to achieve uniform temperature distribution, especially in the corners far from the evaporator and near the door cover, where dead spots are easily formed, resulting in a higher local temperature and failing to meet the requirements of some storage scenarios that require higher uniformity of temperature.

[0003] To solve the above problems, the prior art attempts to improve the circulation effect by increasing the air volume of the fan or adding auxiliary air ducts, but this often leads to problems such as increased noise, increased energy consumption, and occupation of effective volume. For example, the existing Chinese patent with publication number CN110057148A discloses an air-cooled refrigerator, which proposes an air-cooled refrigerator with an air outlet duct on the door body, which improves the temperature distribution to some extent, but still relies on the power of a single fan and cannot fundamentally solve the problems of local high temperature 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 and uniform temperature control in the refrigerator while ensuring low noise and low energy consumption. SUMMARY

[0005] To solve the above problems, the present application proposes an air-cooled double-circulation refrigerator operation control system and a refrigerator, which realizes the function of controlling the refrigerator.

[0006] The technical solution adopted by the present application to solve its technical problems is as follows: In the first aspect, the present application provides an air-cooled double-circulation refrigerator operation control system, which comprises: a main fan starting module: when the temperature sensor detects that the temperature in the refrigerator is higher than the set upper limit of the temperature and the temperature overrun duration is greater than the set duration threshold, the refrigeration unit and the evaporative fan are started.

[0007] A main fan operation control module: during the refrigeration process, the temperature difference between the current temperature in the refrigerator and the set temperature changes in turn to enter a plurality of running stages, and the evaporative fan is dynamically controlled according to the corresponding speed parameters of each running stage.

[0008] An auxiliary fan triggering module: when detecting that the temperature in the refrigerator is uneven or there is high temperature intrusion, the micro fan and the evaporative fan are triggered to run simultaneously.

[0009] Auxiliary fan regulation module: obtain the position of the temperature uneven area and the area temperature difference or the position of the high temperature area and the temperature rise rate, combine the object stacking height in the cabinet, analyze the wind direction, wind volume and wind speed of the micro fan, and regulate the air outlet array of the micro fan.

[0010] Auxiliary fan exit module: when detecting that the temperature difference of the temperature uneven area is eliminated and the temperature in the cabinet drops to the set temperature, control the micro fan to stop running, and maintain refrigeration by the evaporative fan alone.

[0011] In the second aspect, the application also provides a refrigerator, which comprises the air-cooled double-cycle refrigerator operation control system according to the application.

[0012] Compared with the prior art, the application has the following beneficial effects: 1. The application forms a double-cycle mechanism with clear primary and secondary and relay air supply through the cooperative work of the evaporative fan and the micro fan, ensures that cold air can effectively cover the traditional refrigeration dead angle, and significantly improves the temperature uniformity in the cabinet.

[0013] 2. In the application, the main fan dynamically switches the running stage according to the real-time temperature difference, such as the powerful cooling stage, the approaching adjustment stage, the constant temperature maintenance stage, the dormancy stage, etc., which greatly reduces the energy consumption and the running noise while ensuring the refrigeration effect.

[0014] 3. The application intelligently triggers and regulates the micro fan through multiple judgments of the area temperature difference and the temperature rise rate, quickly suppresses high temperature invasion and local overheating, and improves the adaptability of the system under complex working conditions.

[0015] 4. The application combines monocular vision and structured light technology to identify the stacking form and height of the objects in the cabinet in real time, dynamically adjusts the wind speed and direction of the micro fan, and ensures accurate and effective air supply. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a system module connection diagram of the application.

[0018] Figure 2 It is a refrigerator structure schematic diagram of the application.

[0019] Figure 3 It is an evaporative fan dynamic regulation flowchart of the application.

[0020] Figure 4 It is a system overall working process schematic diagram of the application.

[0021] Reference numerals: 1. Evaporative fan; 2. Micro fan; 3. Air inlet; 4. Air outlet array. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be apparently and completely described below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figure 1 and Figure 4 The first aspect of the present application provides a wind-cooled double-cycle refrigerator operation control system, which comprises a main fan starting module, a main fan operation control module, an auxiliary fan triggering module, an auxiliary fan regulation module and an auxiliary fan exiting module.

[0024] The main fan operation control module is connected with the main fan starting module and the auxiliary fan triggering module, and the auxiliary fan regulation module is connected with the auxiliary fan triggering module and the auxiliary fan exiting module.

[0025] When the temperature sensor detects that the temperature in the cabinet is higher than the set upper limit of the temperature and the temperature overrun duration is greater than the set duration threshold, the main fan starting module starts the refrigeration unit and the evaporative fan.

[0026] Further, the specific working process of the main fan starting module is that the cabinet inner side wall area is divided into a plurality of sub-areas in a grid pattern, temperature sensors are arranged at the center points of the sub-areas to form a cabinet temperature sensor network, and the temperatures at each point are obtained in real time.

[0027] According to the set temperature of the refrigerator and the preset allowable temperature fluctuation range, the upper limit and the lower limit of the set temperature are calculated.

[0028] When the temperature at a certain point in the cabinet temperature sensor network is higher than the set upper limit of the temperature, a timer is triggered, and when the temperature overrun duration is greater than the set overrun duration threshold, the refrigeration unit and the evaporative fan are started.

[0029] It should be noted that the cabinet temperature sensor network is connected with the refrigerator main control unit through a wireless communication mode, so as to realize data transmission and exchange. The temperature sensor selects an NTC thermistor, which is suitable for the required temperature range of food storage, has high precision, low cost, small size and fast response speed.

[0030] It should be noted that the allowable temperature fluctuation range is pre-set according to the preservation or freezing process requirement of the stored goods. The range is generally determined based on the optimal storage temperature characteristics of the goods, industry standards or relevant technical specifications, and stored as a fixed parameter in the memory of the refrigerator main control unit, providing a reference for the calculation of the upper and lower temperature limits.

[0031] It should be noted that the temperature overrun duration threshold is obtained by experimental calibration based on the volume of the refrigerator, the performance of the refrigeration unit and the heat load characteristics. The threshold aims to avoid frequent start-stop of the unit due to normal disturbances such as short-term door opening. The specific value is optimized and pre-set 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 the present application can effectively distinguish between temporary temperature fluctuations and persistent temperature abnormalities by setting a temperature overrun duration threshold. This mechanism avoids frequent start-stop of the compressor and fan due to instantaneous temperature changes, effectively preventing false positives.

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

[0034] It should be noted that, as shown in Figure 2 The refrigerator in the present application is equipped with two fans: an evaporative fan located at the bottom of the cabinet on one side, and a micro fan located at the cover plate. The evaporative fan is used to forcibly drive air to flow through the evaporator to remove cold energy, and then deliver the cooled air to each area in the cabinet to achieve efficient forced convection heat transfer. The micro fan draws cold energy around the evaporator through the air inlet, and directs the airflow to the designated area through the air outlet array, thereby providing air supply relay for the evaporative fan to ensure that cold air can effectively reach locations far from the evaporator. The evaporative fan and the micro fan correspond to two independent air duct structures respectively, and together realize the double-drive circulating air supply mechanism.

[0035] It should be noted that the evaporative fan as the main circulating power unit is always in the core operating position, which intelligently switches among the four stages of strong cooling, near adjustment, constant temperature maintenance and dormancy according to the overall temperature deviation in the cabinet, and is responsible for establishing and maintaining the basic low temperature environment in the cabinet. When the local temperature unevenness problem or high temperature invasion that cannot be solved by the evaporative fan itself circulation occurs, the micro fan is started immediately to direct air supply to the high temperature dead angle area, and assists in completing the temperature uniformity regulation. After the temperature of the area returns to normal, the micro fan automatically exits operation, and the system still bears the continuous refrigeration task independently by the evaporative fan.

[0036] The main fan operation control module enters a plurality of operation stages in sequence according to the temperature difference between the current temperature in the cabinet and the set temperature during the refrigeration process, and dynamically regulates the evaporative fan according to the corresponding speed parameters of each operation stage.

[0037] Further, referring to Figure 3 The specific working process of the main fan operation control module is that the current temperature in the cabinet is monitored in real time during the refrigeration process and compared with the set temperature to obtain a dynamic temperature difference, and the evaporative fan is caused to enter different operation stages according to the threshold range of the temperature difference; wherein: when the dynamic temperature difference is greater than a first set threshold, the strong cooling stage is entered, and the speed parameter corresponding to the stage in the database is called to control the high-speed operation of the evaporative fan.

[0038] When the dynamic temperature difference is greater than a second set threshold and less than or equal to the first set threshold, the near adjustment stage is entered, and the speed parameter corresponding to the stage in the database is called to control the medium-speed operation of the evaporative fan.

[0039] When the current temperature reaches the set temperature, the constant temperature maintenance stage is entered, and the speed parameter corresponding to the stage in the database is called to control the low-speed operation of the evaporative fan.

[0040] When the current temperature drops to the lower limit of the set temperature, the dormancy stage is entered, the refrigeration unit and the evaporative fan are turned off, and the cycle is run accordingly.

[0041] It should be noted that the current temperature in the cabinet refers to the temperature of the highest point in the temperature sensor network of the cabinet body.

[0042] It should be noted that the first set threshold and the second set threshold of the temperature difference are determined by experiment calibration and optimization based on the refrigeration performance, thermal load characteristics and target temperature control accuracy of the refrigerator. Specifically, the relationship between the temperature drop rate and the fan energy consumption under different working conditions is tested, the critical temperature difference point that can consider the cooling efficiency and stable operation is selected as the threshold, and the system parameter is pre-stored in the control database.

[0043] In one specific embodiment, when the refrigerator is just started, a large amount of new food is put in at one time, or the door is opened for a long time, the temperature in the cabinet is much higher than the set value, at this time the dynamic temperature difference is greater than 5℃, the evaporative fan enters the powerful cooling stage, the evaporative fan runs at rated speed to provide maximum air volume to achieve rapid cooling; when the temperature gradually approaches the set value, the temperature difference becomes smaller, the dynamic temperature difference is between 1℃ and 5℃, the evaporative fan enters the approach adjustment stage, the evaporative fan runs at 50% to 70% of rated speed, by reducing the fan speed and reducing the air volume, the temperature can be stabilized, and the large air volume can also avoid taking away too much water from the food, and it is more energy-saving and quiet; when the temperature reaches the set temperature, i.e. the dynamic temperature difference is zero, it enters the constant temperature maintenance stage, the evaporative fan runs at 20% to 30% of rated speed or intermittently, maintains weak air circulation, eliminates temperature stratification caused by static air, and ensures temperature uniformity; when the temperature drops to the lower limit of the set temperature, it enters the hibernation stage, the refrigeration unit and the evaporative fan are turned off.

[0044] In this embodiment, the main fan in the application dynamically switches the running stage according to the real-time temperature difference, such as the powerful cooling stage, the approach adjustment stage, the constant temperature maintenance stage, and the hibernation stage, which greatly reduces the energy consumption and operating noise while ensuring the refrigeration effect.

[0045] The auxiliary fan triggering module triggers the micro fan and the evaporative fan to run simultaneously when detecting that the temperature in the cabinet is uneven or there is a high temperature intrusion.

[0046] Further, the specific working process of the auxiliary fan triggering module for detecting uneven temperature in the cabinet is: according to the historical operation data of the refrigerator, the dead angle area of the refrigerator is determined, and a plurality of measuring points with temperature sensors are uniformly arranged in the area.

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

[0048] If the area temperature difference of a certain measuring point is greater than the set area temperature difference threshold and the area temperature difference exceeds the set duration, the cabinet temperature is determined to be uneven, and the area to which the measuring point belongs is marked as a temperature uneven area.

[0049] It should be noted that the refrigeration dead angle area refers to the key area in the refrigerator that is far from the evaporative fan return air inlet and is most likely to form a dead angle, such as the uppermost corner, the door cover, etc.

[0050] It should be noted that the area temperature difference threshold and the area temperature difference overrun duration threshold are based on the maximum allowed thermal deviation between the refrigeration dead angle and the main return air outlet and the system disturbance resistance requirement, and are set through historical data statistics and experimental verification. Specifically, by analyzing the temperature data difference under normal fluctuation and real failure, the critical difference value and the minimum duration that can effectively distinguish between temporary fluctuation and persistent temperature unevenness are determined, and the set of optimized values are pre-stored in the control unit as system parameters.

[0051] In one specific embodiment, when the area temperature difference is greater than 3℃ and lasts for 2 minutes, it is determined that the temperature in the cabinet is uneven, and the micro fan is started.

[0052] Further, the specific working process of detecting the existence of high temperature intrusion in the auxiliary fan triggering module is: according to the temperature of each point in the cabinet temperature sensor network, identifying the highest temperature point and recording it as the high temperature point; calculating the temperature difference between the high temperature point and the lowest temperature point and recording it as the temperature fluctuation.

[0053] If the temperature fluctuation is greater than the set temperature fluctuation threshold and the temperature fluctuation overrun duration reaches the 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 overrun duration threshold are based on the normal temperature field uniformity requirement in the cabinet and the characteristics of common disturbances such as door opening heat intrusion, and are determined through experimental data and statistical analysis. Specifically, by simulating typical high temperature intrusion scenarios, the temperature range and its duration distribution under normal fluctuation and abnormal intrusion are statistically analyzed, and the critical range and the minimum duration that can effectively distinguish between temporary disturbance and persistent intrusion are selected, and the set of optimized values are pre-stored in the control unit as system parameters.

[0055] In this embodiment, the present application intelligently triggers and controls the micro fan through multiple judgments of area temperature difference and temperature rise rate, quickly suppresses high temperature intrusion and local overheating, and improves the adaptability of the system under complex working conditions.

[0056] The auxiliary fan control module obtains the position of the temperature uneven area and the area temperature difference or the position of the high temperature area and the temperature rise rate, analyzes the wind direction, wind 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.

[0057] Further, the specific working process of analyzing the wind direction, wind volume and wind speed of the micro fan in the auxiliary fan control module is: D1: obtain the triggering condition type of the micro fan, if only temperature unevenness is detected, execute D2; if only high temperature intrusion is detected, execute D3; if temperature unevenness and high temperature intrusion are detected simultaneously, execute D4.

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

[0059] Determine the direction pointing to the temperature uneven area as the direction of the micro fan.

[0060] According to the area temperature difference, combine the preset mapping relationship between the area temperature difference and the air volume to determine the air volume of the micro fan.

[0061] According to the object stacking height determined according to the object stacking posture, calculate the vertical distance from the object surface to the micro fan as the air flow range, and combine the preset mapping relationship between the air flow range and the wind speed to determine the wind speed of the micro fan.

[0062] D3: Obtain the position of the high temperature area and the temperature rise rate.

[0063] Determine the direction pointing to the high temperature area as the direction of the micro fan.

[0064] According to the temperature rise rate, combine the preset mapping relationship between the temperature rise rate and the air volume to determine the air volume of the micro fan.

[0065] According to the object stacking height, analyze the wind speed of the micro fan.

[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 not, execute D6.

[0067] D5: Determine the direction pointing to the target area as the direction of the micro fan.

[0068] Obtain the air volume corresponding to the area temperature difference and the temperature rise rate of the target area respectively, and obtain the target air volume by linearly weighting and fusing.

[0069] According to the object stacking height, analyze the wind speed of the micro fan.

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

[0071] Based on the position of the temperature uneven area, the area temperature difference and the object stacking height, obtain the second group of data of the wind direction, the air volume and the wind speed of the micro fan according to the D2 step.

[0072] Integrate the first group of data and the second group of data to obtain the final data of the wind direction, the air volume and the wind speed of the micro fan, wherein the execution order of the first group of data is prior to the second group of data.

[0073] It should be noted that the greater the regional temperature difference, the greater the required air volume. The mapping relationship between the regional temperature difference and the air volume is a positive correlation mapping relationship, the purpose of which is to provide sufficient air exchange to balance the temperature. The mapping relationship between the regional temperature difference and the air volume is determined based on a combination of theoretical calculation, simulation and experimental data. Specifically, through an experimental method, the micro fan is controlled to operate at different air volumes in a wind tunnel or an actual cabinet, and the regional temperature difference eliminated by different air volumes is measured and recorded. After collecting enough data points, a curve can be drawn or piecewise linear fitting can be performed to determine the functional relationship between the two, which is preset and stored in the control unit of the system.

[0074] It should be noted that the micro fan is built into the cover plate of the refrigerator, and the vertical distance from the object surface to the micro fan is the vertical distance from the object surface to the cabinet door.

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

[0076] It should be noted that the faster the temperature rise rate, the more urgent the heat crisis, and the greater and more rapid the required air volume. The mapping relationship between the temperature rise rate and the air volume is a positive correlation mapping that emphasizes rapid response, the purpose of which is to quickly extinguish the heat source. The setting of this mapping relationship focuses on dynamic response and suppression speed. Specifically, the temperature rise rate reflects the degree of danger of a sharp rise in temperature. By simulating a high-temperature invasion scenario, the suppression effect of the temperature rise rate under different air volumes is tested. From this, a mapping table or functional relationship of the temperature rise rate-required air volume is established. The relationship is preset and stored in the control unit of the system.

[0077] It should be noted that the method of analyzing the wind speed of the micro fan in steps D3 and D5 is the same as the method of analyzing the wind speed of the micro fan in step D2.

[0078] It should be noted that the weight of the air volume corresponding to the regional temperature difference and the temperature rise rate can be set according to industry experience, or can be obtained through a limited number of test data, such as collecting historical data of regional temperature difference and temperature rise rate under different working conditions, then calculating the correlation coefficient of the influence of regional temperature difference and temperature rise rate on the required air volume, using regression analysis or principal component analysis to determine the contribution of the two, and finally normalizing the contribution to convert it into the corresponding weight and the sum of which is 1.

[0079] It should be noted that the priority of the execution sequence is based on the consideration of the safety risk level. High temperature intrusion represents an active and urgent heat threat, and if it cannot be handled in time, it may cause serious consequences such as equipment damage, fire, etc., while temperature unevenness is a static and optimization problem involving energy efficiency and uniform heat dissipation, but the risk is low in a short period of time. The present application is based on the principle that safety is prior to optimization. The D3 step is executed first to handle high temperature intrusion, which can handle the most dangerous situation in the first time to prevent the situation from deteriorating, and then the D2 step is executed to handle temperature unevenness to fine-tune the overall heat dissipation environment. This sequence ensures that the system can make the most reasonable and safest response under complex working conditions.

[0080] Further, the specific working process of determining the object stacking height is: S1: through the monocular vision sensor and the structured light projection device arranged at the top of the refrigerator, the object in the cabinet is three-dimensionally scanned, the three-dimensional profile is reconstructed, and the corresponding three-dimensional space model is constructed.

[0081] S2: Based on the three-dimensional space model, it is judged whether the upper surface of the object is a flat surface. If it is a flat surface, the height value of any point on the upper surface is taken as the object stacking height, otherwise S3 is executed.

[0082] S3: The number of convex parts on the upper surface is identified. If it is a single convex part, it is determined as the target convex part. If there are multiple convex parts, the one with the largest volume is selected as the target convex part.

[0083] S4: The proportion of the volume of the target convex part to the overall stacking volume of the object is calculated. If the proportion is greater than a preset proportion threshold, the height of the target convex part is taken as the object stacking height, otherwise the height at which the target convex part is located at the bottom is taken as the object stacking height.

[0084] In the present embodiment, the present application combines monocular vision and structured light technology to identify the stacking form and height of the goods in the cabinet in real time, and dynamically adjusts the wind speed and direction of the micro fan to ensure accurate and effective air supply.

[0085] Further, the specific working process of the auxiliary fan regulation module for regulating the outlet array of the micro fan is: according to the wind direction of the micro fan, and in combination with the predefined corresponding relationship between each sub-area of the outlet array and the wind direction, the working sub-area to be activated is determined.

[0086] According to the air volume of the micro fan, and in combination with the matching relationship between the preset air volume range and the number of outlets, the number of outlets to be enabled in the working sub-area is determined.

[0087] According to the wind speed of the micro fan, the wind speed value of the enabled outlet is set.

[0088] Based on the determined working sub-area, the number of enabled outlets in the sub-area, and the wind speed value of each outlet, the outlet array of the micro fan is comprehensively regulated.

[0089] It should be noted that the air duct structure design of the micro fan includes a centrally arranged air inlet and an outlet array composed of a plurality of uniformly distributed outlets.

[0090] It should be noted that the adjustment of the wind speed is realized by controlling the speed of the micro fan. The greater the speed, the greater the wind speed.

[0091] When the temperature difference in the temperature uneven area is eliminated and the temperature in the cabinet is reduced to the set temperature, the auxiliary fan exit module controls the micro fan to stop running, and the evaporative fan alone maintains refrigeration.

[0092] Further, the determination condition of the temperature difference elimination in the auxiliary fan exit module is that the area temperature difference of the temperature uneven area is lower than the set threshold and the state lasts for a set duration, and the determination condition of the temperature in the cabinet being reduced to the set temperature is that all point temperatures in the temperature sensor network arranged in the cabinet are lower than or equal to the set temperature.

[0093] It should be noted that when the temperature in the cabinet is reduced to the set temperature, i.e., the temperature of each point in the temperature sensor network is reduced to the set temperature, the high-temperature area disappears.

[0094] It should be noted that the micro fan realizes independent start and stop and precise regulation according to the local temperature unevenness or high-temperature intrusion signal. This control method has the following advantages: first, the micro fan is only used in short high-load working conditions, and the evaporative fan runs independently most of the time, effectively reducing the overall energy consumption of the system; second, in the normal running state, the evaporative fan can maintain a low speed or even intermittent pause, thereby significantly reducing the noise level of the equipment and improving the user experience; third, the micro fan only runs when necessary, and the cumulative working time is greatly shortened, which helps to prolong the service life and improve the system reliability.

[0095] In the embodiment, the application forms a double circulation mechanism of clear primary and secondary and relay air supply through the cooperation of the evaporative fan and the micro fan, ensures that the cold air can effectively cover the traditional refrigeration dead angle, and significantly improves the temperature uniformity in the cabinet.

[0096] In the embodiment, the application realizes the significant improvement of the refrigerator operation efficiency and temperature uniformity through the introduction of the double fan cooperation intelligent control mechanism, the combination of the multi-sensor network and the dynamic regulation and control strategy.

[0097] In the second aspect, the application further provides a refrigerator, which comprises the air-cooled double circulation refrigerator operation control system according to the application.

[0098] The above formulas are all dimensionless numerical calculations, the formulas are obtained by software simulation of a large amount of data to obtain a formula of the latest real situation, and the preset parameters in the formula are set by a person skilled in the art according to the actual situation.

[0099] The above embodiments can be realized wholly or partially by software, hardware, firmware or any combination thereof. When realized by software, the above embodiments can be realized in the form of a computer program product wholly or partially.

[0100] Those skilled in the art can realize that the modules and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solutions. A person skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0101] In addition, the functional modules in each embodiment of the present application can be integrated in one processing module, or each module can exist physically independently, or two or more modules can be integrated in one module.

[0102] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0103] Finally, the above is merely a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

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. 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 detected 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. Specifically: When the dynamic temperature difference is greater than the first set threshold, it enters the strong cooling stage 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 but less than or equal to the first set threshold, it enters the approach adjustment stage and calls the corresponding speed parameters in the database to control the evaporator fan to run at medium speed; when the current temperature reaches the set temperature, it 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 lower temperature, it enters the sleep stage, shuts down the cooling unit and the evaporator fan, and continues to operate in this cycle. 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 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 simultaneously, execute D4; D2: Obtain the location and temperature difference of the temperature unevenness area; take the direction pointing to the temperature unevenness area as the wind direction of the micro fan; determine the air volume of the micro fan based on the temperature difference of the area and the preset mapping relationship between the temperature difference and air volume; determine the stacking height of the objects based on the stacking posture of the objects in the cabinet, calculate the vertical distance from the object surface to the micro fan based on the stacking height as the airflow range, and determine the wind speed of the micro fan based on the preset mapping relationship between the airflow range and wind speed; D3: Obtain the location and temperature rise rate of the high temperature area; take the direction pointing to the high temperature area as the wind direction of the micro fan; determine the air volume of the micro fan based on the temperature rise rate and the preset mapping relationship between the temperature rise rate and air volume. The system determines the airflow of the micro fan; analyzes the wind speed of the micro fan based on the stacking height of the objects; D4: determines whether the temperature uneven area and the high-temperature area belong to the same area. If so, the area is identified as the target area, and D5 is executed; otherwise, D6 is executed; D5: the direction pointing to the target area is taken as the wind direction of the micro fan; the airflow corresponding to the regional temperature difference and temperature rise rate of the target area is obtained, and the target airflow is obtained through linear weighted fusion; the wind speed of the micro fan is analyzed based on the stacking height of the objects; D6: based on the location, temperature rise rate, and stacking height of the high-temperature area, the first set of data of the micro fan wind direction, airflow, and wind speed is obtained according to step D3; based on the location, regional temperature difference, and stacking height of the temperature uneven area, the second set of data of the micro fan wind direction, airflow, and wind speed 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 the micro fan wind direction, airflow, and wind speed, wherein the execution order of the first set of data takes precedence over the second set of data. The specific process for determining the stacking height of objects is as follows: S1: Using a monocular vision sensor and structured light projection device installed on the top of the freezer, the objects stacked inside the freezer are scanned in three dimensions to reconstruct their three-dimensional contours and construct a corresponding three-dimensional spatial model; S2: Based on the three-dimensional spatial model, it is determined whether the upper surface of the object is flat. If it is flat, the height value of any point on the upper surface is taken as the stacking height of the object; otherwise, proceed to S3; S3: The number of protruding parts on the upper surface is identified. If it is a single protruding part, it is determined as the target protruding part. If there are multiple protruding parts, the one with the largest volume is selected as the target protruding part; S4: The ratio of the volume of the target protruding part to the total stacking volume of the objects is calculated. If the ratio is greater than a preset ratio threshold, the height of the target protruding part is taken as the stacking height of the objects; otherwise, the height of the bottom of the target protruding part is taken as the stacking height of the objects.

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 activated.

3. 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.

4. 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.

5. 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.

6. 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.

7. A freezer, characterized in that: The freezer includes the air-cooled dual-cycle freezer operation control system according to any one of claims 1-6.

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