Dual-cycle refrigerator and defrosting control method

Abstract

This invention provides a dual-cycle refrigerator and a defrosting control method. The defrosting control method includes acquiring cooling time, a first temperature detection value, a time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turn on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by a temperature sensor, the time interval is the time interval since the last defrosting, and the defrosting mode includes active defrosting or follow-up defrosting. Based on the defrosting mode, a second temperature detection value is acquired, which is the temperature value of the variable-temperature zone detected by a variable-temperature sensor. A first termination rule is generated to turn off the refrigerator fan, whereby the second temperature detection value is greater than or equal to a first detection threshold. This method enters a cooling state when the temperature of the variable-temperature zone exceeds a certain threshold, which can reduce temperature fluctuations and solve the problem of high temperature rise in the variable-temperature zone.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a dual-cycle refrigerator and a defrosting control method. Background Technology

[0002] Dual-cycle refrigerators utilize independent cooling systems to provide the necessary cooling capacity to both the refrigerator and freezer compartments, resulting in more precise temperature control and better food preservation. Dual-cycle refrigerators not only improve energy efficiency but also reduce odor cross-contamination between the refrigerator and freezer compartments, enhancing the user experience.

[0003] For the defrosting control process of a dual-cycle refrigerator, timed defrosting or temperature-sensor defrosting can be used, determining when to defrost by monitoring temperature changes in the freezer compartment. For the variable-temperature zone in a dual-cycle refrigerator, this zone can be constructed as a relatively isolated space to minimize the impact of temperature fluctuations during defrosting on the internal environment. For example, the variable-temperature zone can be designed as a sealed chamber to reduce heat exchange between the zone and the external refrigerator compartment.

[0004] However, during defrosting, the return air path of the variable temperature zone remains connected to the cold storage compartment, affecting the zone's airtightness and failing to reduce the temperature rise, resulting in a higher temperature rise in the variable temperature zone. Summary of the Invention

[0005] This application provides a dual-cycle refrigerator and a defrosting control method to solve the problem of high temperature rise in the variable temperature zone.

[0006] In a first aspect, this application provides a dual-cycle refrigerator, comprising:

[0007] The cabinet includes a refrigerator compartment and a freezer compartment;

[0008] The cold storage compartment includes a cold storage evaporator, a cold storage fan, a variable temperature zone, a cold storage air duct assembly, and a temperature sensor; the freezer compartment includes a freezer evaporator and a freezer fan.

[0009] The refrigerated air duct assembly includes a temperature sensor, which is used to detect the temperature of the temperature variable zone;

[0010] The controller is configured as follows:

[0011] The system acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turns on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by the temperature sensor, the time interval is the time interval since the last refrigerator defrosting, and the defrosting mode includes active defrosting or follow-up defrosting.

[0012] Based on the defrosting mode, a second temperature detection value is obtained, which is the temperature value of the variable temperature zone detected by the variable temperature sensor.

[0013] A first termination rule is generated to shut down the refrigeration fan, wherein the first termination rule is that the second temperature detection value is greater than or equal to a first detection threshold.

[0014] In some feasible embodiments, the defrosting mode includes a first active defrosting mode, a second active defrosting mode, and a follow-defrosting mode;

[0015] The controller acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode, specifically configured as follows:

[0016] If the cooling time is greater than the cooling time threshold and the first temperature detection value is less than the second detection threshold, a first active defrosting mode is generated, and the refrigerator compartment is controlled to enter the defrosting process.

[0017] If the time interval is greater than or equal to the time interval threshold, a second active defrosting mode is generated, and the refrigerator compartment is controlled to enter the defrosting process;

[0018] If the freezer compartment is in the defrosting process, generate a follow defrosting mode and control the refrigerator compartment to enter the defrosting process.

[0019] In some feasible embodiments, the controller is further configured to:

[0020] Based on the defrosting mode, a third temperature detection value is obtained, which is the third temperature value of the refrigeration evaporator detected by the temperature sensor.

[0021] If the defrosting mode is a first active defrosting mode or a second active defrosting mode, a second termination rule is generated, wherein the third temperature detection value is greater than or equal to the third detection threshold.

[0022] In some feasible embodiments, a refrigeration sensor is installed in the refrigeration room to detect the temperature of the refrigeration room;

[0023] The controller is also configured to:

[0024] Obtain a fourth temperature detection value, wherein the fourth temperature detection value is the temperature value of the cold storage compartment detected by the cold storage sensor;

[0025] If the defrosting mode is the follow defrosting mode, a third termination rule is generated, wherein the third termination rule is that the fourth temperature detection value is greater than or equal to the fourth detection threshold.

[0026] In some feasible embodiments, the refrigerated air duct assembly further includes a refrigerated mask and a refrigerated air duct, wherein the refrigerated mask is provided with a plurality of first air outlets, the first air outlets being connected to a variable temperature zone and used to blow air into the variable temperature zone.

[0027] The refrigeration air duct is equipped with multiple second air outlets, which are connected to the refrigeration compartment and are used to blow air into the refrigeration compartment.

[0028] The refrigerated air duct is equipped with a refrigerated air door, and the refrigerated air door is provided with a first air outlet and a second air outlet. The first air outlet is connected to the refrigerated compartment, and the second air outlet is connected to the variable temperature zone.

[0029] The controller is also configured to:

[0030] Based on the defrosting mode, turn on the refrigeration fan and close the refrigeration damper.

[0031] In some feasible embodiments, the refrigeration mask is provided with a return air vent, which is used to transfer heat from the refrigeration compartment and the variable temperature zone to the refrigeration evaporator.

[0032] In some feasible embodiments, after the controller executes the generation of a first termination rule to shut down the refrigeration fan via the first termination rule, it is further configured to:

[0033] Obtain a fifth temperature detection value, wherein the fifth temperature detection value is the second temperature value of the refrigeration evaporator detected by the temperature sensor;

[0034] If the fifth temperature detection value is greater than the defrosting temperature threshold, the defrosting state is marked as the end state, and instructions are sent to the cold storage room, the variable temperature zone and the refrigeration fan to control the cold storage room and the variable temperature zone to issue a cooling request and to start the refrigeration fan.

[0035] If the fifth temperature detection value is less than or equal to the defrosting temperature threshold, the defrosting state is marked as not completed, and a command is sent to the refrigeration damper to control the refrigeration damper to close.

[0036] In some feasible embodiments, the controller is further configured to:

[0037] A preset delay time is defined as the opening interval of the refrigeration damper.

[0038] If the defrosting state is the end state, after the delay time, a command is sent to the refrigerator door to control the refrigerator door to open.

[0039] In some feasible embodiments, an auxiliary cooling device is provided in the temperature-changing zone;

[0040] After the controller executes the defrosting mode and obtains the second temperature detection value, it is specifically configured as follows:

[0041] A preset fluctuation range is defined as the target temperature fluctuation range of the variable temperature zone.

[0042] If the second temperature detection value exceeds the fluctuation range, a command is sent to the auxiliary cooling device to control the activation of the auxiliary cooling command.

[0043] Alternatively, a command can be sent to the refrigeration fan to control it to increase its speed and open the refrigeration damper.

[0044] Secondly, this application provides a defrosting control method, comprising:

[0045] The system acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turns on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by the temperature sensor, the time interval is the time interval since the last defrosting of the refrigerator compartment, and the defrosting mode includes active defrosting or follow-up defrosting.

[0046] Based on the defrosting mode, a second temperature detection value is obtained, which is the temperature value of the variable temperature zone detected by the variable temperature sensor.

[0047] A first termination rule is generated to shut down the refrigeration fan, wherein the first termination rule is that the second temperature detection value is greater than or equal to a first detection threshold.

[0048] As can be seen from the above technical solutions, this application provides a dual-cycle refrigerator and a defrosting control method. The defrosting control method includes acquiring cooling time, a first temperature detection value, a time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turn on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by a temperature sensor, the time interval is the time interval since the last refrigerator defrost, and the defrosting mode includes active defrosting or follow-up defrosting. Based on the defrosting mode, a second temperature detection value is acquired, which is the temperature value of the variable temperature zone detected by a variable temperature sensor. A first termination rule is generated to turn off the refrigerator fan, whereby the second temperature detection value is greater than or equal to a first detection threshold. This method enters a cooling state when the temperature of the variable temperature zone exceeds a certain threshold, which can reduce temperature fluctuations and solve the problem of high temperature rise in the variable temperature zone. Attached Figure Description

[0049] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of a dual-cycle refrigerator structure provided in an embodiment of this application;

[0051] Figure 2 This is a schematic diagram of the structure of the fan and evaporator in the freezer and refrigerator compartments provided in the embodiments of this application;

[0052] Figure 3 This is a schematic diagram of the cold storage compartment structure provided in an embodiment of this application;

[0053] Figure 4 A side view of the cold storage compartment provided in an embodiment of this application;

[0054] Figure 5 A cross-sectional view of a refrigerated air duct assembly provided in an embodiment of this application;

[0055] Figure 6 Exploded view of the refrigerated air duct assembly provided in the embodiments of this application;

[0056] Figure 7 This is a schematic flowchart of the defrosting control method provided in an embodiment of this application.

[0057] Illustration:

[0058] Among them, 01-box body, 1-refrigerated compartment, 10-refrigerated air duct assembly, 11-refrigerated evaporator, 111-temperature sensor, 12-refrigerated fan, 02-door, 2-freezer compartment, 13-freezer evaporator, 14-freezer fan, 15-shelf, 16-first drawer, 17-variable temperature zone, 101-refrigerated cover, 1011-second air outlet, 1012-return air outlet, 102-refrigerated air duct, 1021-first air outlet, 103-refrigerated air door, 1031-first air vent, 1032-second air vent, 104-adhesive sponge, 105-air duct cover, 106-aluminum foil sponge, 107-variable temperature sensor, 108-refrigerated sensor. Detailed Implementation

[0059] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0060] Dual-cycle air-cooled refrigerators have two independent cooling systems, including two evaporators, two fans, and two compressors. Each cooling system operates independently, controlling the temperature of the refrigerator compartment and the freezer compartment separately. At the same time, the air-cooling technology ensures more even circulation of cold air inside the refrigerator, avoiding potential temperature fluctuations and frost buildup.

[0061] During the defrosting process of a dual-cycle air-cooled refrigerator, the evaporator in either the refrigerator or freezer compartment heats up to melt the frost, causing the ambient temperature to rise. If the variable-temperature zone exchanges heat with the refrigerator compartment during defrosting, for example, through a return air path, the variable-temperature zone will be affected by the temperature rise in the refrigerator compartment, resulting in an increase in its internal temperature.

[0062] Even if the variable temperature zone is designed as a relatively isolated space, its return air path may still be connected to the refrigerator compartment during defrosting. This can cause hot air from the refrigerator compartment to enter the variable temperature zone through the return air path, thereby increasing the temperature of the variable temperature zone.

[0063] Although the variable-temperature zone is constructed as a relatively isolated space, such as a sealed chamber, problems such as incomplete sealing or aging of the sealing materials may occur in actual use. These problems can cause hot outside air to enter the variable-temperature zone, or during defrosting, hot air from the refrigerator compartment can more easily enter the variable-temperature zone through gaps, thereby increasing its temperature.

[0064] If the refrigerator's defrosting control strategy is not precise or reasonable enough, such as excessively long defrosting time or excessively high defrosting temperature, the temperature in the refrigerator compartment and the variable temperature zone will rise. Especially during defrosting, if the temperature fluctuations in the refrigerator compartment are not effectively controlled, these fluctuations will be transmitted to the variable temperature zone through the return air path, thus affecting its temperature stability.

[0065] To address the issue of high temperature rise in the variable temperature zone, some embodiments of this application provide a dual-cycle refrigerator, such as... Figures 1-6 As shown, it includes: a cabinet 01, which is connected to a door 02. The cabinet 01 includes a refrigerator compartment 1 and a freezer compartment 2, which are used to store foods with different temperature requirements. The refrigerator compartment 1 can be set at around 4°C, which is suitable for keeping food fresh, while the freezer compartment 2 is kept below -18°C for long-term food preservation.

[0066] The cold storage compartment 1 is equipped with multiple shelves 15, including a cold storage evaporator 11, a cold storage fan 12, a variable temperature zone 17, a cold storage air duct assembly 10, and a temperature sensor 111. The cold storage evaporator 11 is a heat exchange component of the refrigeration system. It reduces the ambient air temperature by absorbing heat through refrigerant evaporation and is part of the refrigeration cycle. When the refrigerant flows through the cold storage evaporator 11, it absorbs heat and vaporizes.

[0067] The refrigeration fan 12 is a device used to promote air circulation, distributing cold air evenly throughout the refrigeration compartment 1 to ensure temperature consistency and rapid cooling. The variable temperature zone 17 is a functional area within the refrigeration compartment 1, which can be adjusted to a temperature range different from the conventional refrigeration temperature, allowing users to adjust the storage conditions for specific foods as needed.

[0068] The variable temperature zone 17 can be a drawer structure. Besides the variable temperature zone 17 acting as a drawer, it can also include other drawers. In this embodiment, it also includes a first drawer 16 and a second drawer, such as... Figure 3 As shown, the first drawer 16 is positioned above the temperature-changing zone 17. In one configuration, the temperature-changing zone 17 consists of two drawers. In another configuration, the temperature-changing zone 17 can be a drawer positioned on the right side, and the drawer on the left side can be the second drawer.

[0069] It is understandable that the first drawer 16 and the second drawer are non-temperature-controlled zones, meaning their temperatures cannot be adjusted. Their temperatures can be the same as those in the refrigerator compartment 1, and the first drawer 16 and the second drawer can be adjusted by adjusting the temperature of the refrigerator compartment 1.

[0070] The refrigerated air duct assembly 10 includes a temperature sensor 107 located in the temperature variable zone 17. The temperature sensor 107 is used to monitor the temperature changes in the temperature variable zone 17. The temperature sensor 107 provides the controller with temperature data of the temperature variable zone 17 for precise control.

[0071] In some embodiments, the refrigerated air duct assembly 10 further includes a refrigerated face shield 101 and a refrigerated air duct 102. The refrigerated face shield 101 is a panel located at the front end of the refrigerated air duct 102. The refrigerated face shield 101 is provided with a plurality of first air outlets 1021, and the first air outlets 1021 are connected to the variable temperature zone 17. Cold air can be blown into this zone, thereby achieving precise control of the temperature in the variable temperature zone 17. By setting the first air outlets 1021, the low temperature environment in the variable temperature zone 17 can be maintained, temperature fluctuations can be reduced, and the food preservation quality can be improved.

[0072] A refrigerated air duct 102 is installed inside the refrigerated face shield 101. The refrigerated air duct 102 is used to guide and distribute cold air and to deliver cold air to the refrigerated compartment 1. The refrigerated air duct 102 is provided with multiple second air outlets 1011. The second air outlets 1011 are connected to the refrigerated compartment 1 and are used to blow air into the refrigerated compartment 1, which can improve the uniformity of air distribution in the refrigerated compartment 1.

[0073] Furthermore, a refrigerated air damper 103 is installed on the refrigerated air duct 102. The refrigerated air damper 103 is a valve device installed on the refrigerated air duct 102 to regulate the airflow in different directions. The refrigerated air damper 103 is equipped with a first air outlet 1031 and a second air outlet 1032. The first air outlet 1031 is connected to the refrigerated compartment 1, allowing cold air to flow into the refrigerated compartment 1 as needed. The second air outlet 1032 is connected to the variable temperature zone 17 and can be closed during defrosting or under other specific conditions to isolate the variable temperature zone 17 and prevent unnecessary heat transfer. By controlling the state of the two air outlets, the airflow distribution between the refrigerated compartment 1 and the variable temperature zone 17 can be flexibly adjusted, ensuring effective cooling of the refrigerated compartment 1 while maintaining the temperature conditions of the variable temperature zone 17.

[0074] The back of the refrigerated air duct 102 is also equipped with adhesive sponge 104, which is used to form a complete air circulation and to provide a sealing and isolation function. The air duct cover 105 is installed on the outside of the refrigerated air duct 102 to seal and protect the internal structure. An aluminum foil sponge 106 is placed between the air duct cover 105 and the outside of the refrigerated air duct 102. The aluminum foil sponge 106 serves as a heat insulation layer to maintain the temperature of the cold air and reduce heat conduction loss.

[0075] In some embodiments, the refrigerated cover 101 is provided with a return air vent 1012, which is used to transfer heat from the refrigerated compartment 1 and the variable temperature zone 17 to the refrigerated evaporator 11. The first air vent 1031 and the second air vent 1032 use the refrigerated fan 12 to transport the cooling energy generated by the refrigerated evaporator 11 to the interior of the refrigerated compartment 1 and the variable temperature zone 17 to lower the temperature. The heat from the refrigerated compartment 1 and the variable temperature zone 17 returns to the bottom of the refrigerated evaporator 11 through the return air vent 1012 at the bottom of the refrigerated cover 101 for heat exchange.

[0076] The freezer compartment 2 includes a freezer evaporator 13 and a freezer fan 14. The freezer evaporator 13 is similar to the refrigerator evaporator 11 and provides cooling capacity for the freezer compartment. The freezer fan 14 is similar to the refrigerator fan 12 and is a device for promoting air circulation.

[0077] The controller is configured as follows:

[0078] The system acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turn on the refrigerator fan.

[0079] Based on the defrosting mode, a second temperature detection value is obtained, which is the temperature value of the variable temperature zone detected by the variable temperature sensor.

[0080] A first termination rule is generated to shut down the refrigeration fan by means of the first termination rule, wherein the second temperature detection value is greater than or equal to the first detection threshold.

[0081] Among them, the cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator 11 detected by the temperature sensor 111, and the time interval is the time interval since the last defrost of the refrigerator compartment.

[0082] The defrosting mode includes active defrosting or follow-up defrosting. The defrosting mode includes a first active defrosting mode, a second active defrosting mode, and a follow-up defrosting mode. In some embodiments, if the cooling time is greater than the cooling time threshold and the first temperature detection value is less than the second detection threshold, the first active defrosting mode is generated; if the time interval is greater than or equal to the time interval threshold, the second active defrosting mode is generated.

[0083] In the exemplary first active defrosting mode, the refrigerator compartment continuously cools for ≥90 minutes, and the first temperature value of the refrigerator evaporator 11 detected by temperature sensor 111 is <1℃, thus forcibly entering the refrigerator compartment defrosting process. In the exemplary second active defrosting mode, in non-energy-consuming and non-temperature-storage states, the time since the last refrigerator defrosting start is ≥5 hours, thus forcibly entering the refrigerator compartment defrosting process.

[0084] If the freezer compartment is in the defrosting process, a follow-defrosting mode is generated, meaning that when the freezer compartment enters the defrosting process, the refrigerator compartment simultaneously enters the defrosting process.

[0085] When the defrosting process begins according to different defrosting modes, the cooling requests of the refrigerator compartment 1 and the variable temperature zone 17 are ignored during the defrosting of the refrigerator compartment 1. The freezer compartment 2 can cool normally, and the refrigerator fan 12 is turned on and the refrigerator door 103 is closed to accelerate the air circulation in the refrigerator compartment 1 and improve the defrosting efficiency.

[0086] During defrosting, the refrigeration fan 12 keeps the air circulating in the refrigerator compartment 1, helping to distribute the temperature evenly and prevent localized overheating or underheating. The operation of the refrigeration fan 12 also helps to transfer heat from the refrigerator compartment to the evaporator 11 more quickly, accelerating the melting of the frost. Although the refrigerator compartment is not cooling during this time, the operation of the refrigeration fan 12 helps to restore the temperature of the refrigerator compartment 1 more quickly after defrosting, reducing the impact of temperature fluctuations on food preservation.

[0087] Different defrosting termination rules are set based on different defrosting modes. However, if the temperature detected by the temperature sensor 107, i.e., the temperature of the temperature-variable zone 17, is greater than or equal to the first detection threshold, the defrosting process can be terminated. The first detection threshold is 3, meaning that if the temperature of the temperature-variable zone 17 is ≥3℃, a command is sent to the refrigeration fan 12 to control it to shut down. After defrosting is completed, after a delay period, such as 5 minutes after the refrigeration fan 12 is turned off, the normal refrigeration process resumes.

[0088] In some embodiments, after generating a first termination rule to shut down the refrigeration fan 12, a fifth temperature detection value can also be obtained. The fifth temperature detection value is the second temperature value of the refrigeration evaporator 11 detected by the temperature sensor 111. If the fifth temperature detection value is greater than the defrosting temperature threshold, the defrosting state is marked as the end state, and instructions are sent to the refrigeration compartment 1, the variable temperature zone 17, and the refrigeration fan 12 to control the refrigeration compartment 1 and the variable temperature zone 17 to issue a cooling request and to start the refrigeration fan 12.

[0089] When the temperature sensor 107 detects that the temperature reaches or exceeds 3°C, it indicates that the frost on the evaporator surface has begun to melt during the defrosting process, and the temperature is rising. At the same time, the controller will determine whether defrosting is complete based on the data detected by the temperature sensor 111, i.e., the fifth temperature detection value.

[0090] Temperature sensor 111 can determine the end of the defrosting process in several ways. For example, when the evaporator begins defrosting, the surface temperature gradually rises as the frost melts. If temperature sensor 111 detects a sustained temperature increase that exceeds a threshold, such as 4°C or higher, it indicates that the defrosting process is nearing completion. Another example is that after defrosting, the evaporator surface is no longer obstructed by frost, and the temperature tends to stabilize within a certain range. A stabilization period can be set; that is, after the evaporator temperature reaches the threshold, it remains relatively stable for a period of time, such as 5 minutes, indicating that defrosting is complete. To avoid unnecessary energy waste due to over-defrosting, a maximum allowable defrosting time can also be used for determination. If the defrosting process reaches the set maximum time limit, even if the temperature has not fully stabilized, it indicates that defrosting is complete, preventing excessively long heating operations.

[0091] If the fifth temperature detection value is less than or equal to the defrosting temperature threshold, the defrosting status is marked as not completed, and a command is sent to the refrigerator air damper 103 to control the refrigerator air damper 103 to be in the closed state. Closing the refrigerator air damper 103 can reduce the interference of outside air on the temperature of the refrigerator compartment 1 and ensure that the defrosting process can proceed smoothly.

[0092] In addition to using the variable temperature sensor 107 to determine whether the defrosting process has ended, it can also be determined by the detection result of the temperature sensor 111. Since the defrosting mode includes active defrosting mode and follow-up defrosting mode, the detection threshold is different when the defrosting mode is active defrosting and when the defrosting mode is follow-up defrosting mode.

[0093] After defrosting is complete, the return air path of the variable temperature zone 17 can be restored after a certain period of time to ensure that the evaporator surface is completely dry and the temperature returns to normal. This can prevent the heat shock caused by immediately restoring the return air after defrosting and further reduce the temperature rise of the variable temperature zone 17.

[0094] In some embodiments, the controller is further configured to:

[0095] A preset delay time is defined as the opening interval of the refrigeration damper.

[0096] If the defrosting state is the end state, after the delay time, a command is sent to the refrigerator door to control the refrigerator door to open.

[0097] If the fifth temperature detection value exceeds the defrosting temperature threshold, the defrosting status is marked as ended. The controller has a built-in fixed delay time, such as 5 minutes, which automatically starts the timer after defrosting is confirmed to be complete. The delay time can also be dynamically adjusted according to actual conditions, such as ambient temperature and defrosting duration, to ensure optimal results.

[0098] Firstly, multiple parameters can be monitored, including ambient temperature, defrost duration, evaporator humidity, and refrigerator compartment 1 temperature. Ambient temperature can be monitored in real time using a temperature sensor 111 installed outside or inside the refrigerator. Defrost duration can be recorded to provide an important reference for adjusting the delay time. Evaporator humidity can be monitored using a humidity sensor to ensure the evaporator surface is dry before restoring the return air path. Refrigerator compartment 1 temperature can be monitored to assess the impact of defrosting on the refrigerator.

[0099] Machine learning or adaptive control algorithms can be used to automatically optimize the delay time based on historical data and the current state. Based on preset rules and logical judgments, and considering multiple parameters, the delay time is dynamically adjusted. For example, if the ambient temperature is high, the delay time is appropriately extended to ensure the evaporator is fully dry. If the defrosting time is short, the delay time can be shortened to quickly restore normal cooling. If the evaporator humidity is high, a longer delay time is maintained to ensure thorough drying.

[0100] It also allows users to set default values ​​or adjust ranges for the delay time according to their needs and habits in the application or control panel. Multiple preset scene modes are available, such as energy-saving mode and fast recovery mode. Users can choose the mode suitable for the current situation, and the delay time will be automatically adjusted.

[0101] In high-temperature environments, when the ambient temperature is high, the evaporator surface may take longer to dry completely. If the ambient temperature is detected to exceed a certain threshold, such as 30°C, the delay time is automatically increased, for example, from 5 minutes to 8 minutes, to ensure the evaporator is thoroughly dry and prevent residual moisture from causing secondary frosting.

[0102] In low-temperature environments, the evaporator surface dries faster in cold conditions. If the ambient temperature is detected to be low, such as below 10°C, the delay time can be appropriately shortened, for example, from 5 minutes to 3 minutes, to speed up the recovery of normal cooling and reduce unnecessary waiting time.

[0103] For short defrosting cycles, if the defrosting process is very rapid, for example, less than 10 minutes, it indicates less frost on the evaporator and a shorter drying time. By reducing the defrosting delay time based on the defrosting duration, for example from 5 minutes to 3 minutes, efficiency can be improved and normal cooling can be restored quickly.

[0104] For cases with long defrosting cycles, if the defrosting process is lengthy, for example, exceeding 20 minutes, it indicates a significant amount of frost on the evaporator, requiring more time to dry. Increase the delay time according to the defrosting duration, for example, from 5 minutes to 7 minutes, to ensure the evaporator surface is completely dry and prevent re-frost formation.

[0105] If the evaporator surface remains damp after defrosting, it indicates incomplete drying. If the evaporator humidity exceeds a certain threshold, such as 60%, the delay time is automatically extended, for example, from 5 minutes to 10 minutes, to ensure the evaporator is thoroughly dried.

[0106] By introducing a mechanism to dynamically adjust the delay time, the delay time can be flexibly adjusted according to actual conditions such as ambient temperature and defrosting duration to ensure optimal results. This not only enhances the adaptability and flexibility of the refrigerator but also improves overall energy efficiency. In dual-cycle refrigerators, dynamic adjustment helps to better coordinate the cooling needs of different areas, ensuring that each compartment receives appropriate temperature control, thereby providing a more intelligent and reliable storage environment.

[0107] During the delay period, the refrigerated air damper 103 remains closed, isolating airflow exchange between the variable temperature zone 17 and the refrigerated compartment 1. After the delay period ends, the refrigerated air damper 103 gradually opens, slowly restoring the return air path to avoid sudden airflow impact. By delaying the restoration of the return air path, the heat impact caused by immediately restoring return air after defrosting can be mitigated, reducing the risk of temperature rise in the variable temperature zone. During the delay period, the temperature within the variable temperature zone 17 can remain stable, unaffected by external heat, maintaining ideal storage conditions.

[0108] During the delay time, the evaporator surface has time to dry completely, avoiding secondary frosting caused by residual moisture. Thorough drying of the evaporator surface helps extend its lifespan and reduces corrosion or other damage caused by moisture.

[0109] In some embodiments, a third temperature detection value is obtained based on the defrosting mode, the third temperature detection value being the third temperature value of the refrigeration evaporator 11 detected by the temperature sensor 111.

[0110] If the defrosting mode is a first active defrosting mode or a second active defrosting mode, a second termination rule is generated, wherein the third temperature detection value is greater than or equal to the third detection threshold.

[0111] When the defrosting mode is either the first active defrosting mode or the second active defrosting mode, a second termination rule is generated. The second termination rule is used for actively triggered defrosting situations, which means that the frost on the evaporator surface has been cleared, the temperature has risen to a safe level, and it is ready to resume normal cooling.

[0112] For example, the third temperature threshold is 4. When the defrosting mode is active defrosting, if the third temperature detection value is ≥4℃, the refrigeration fan 12 is turned off.

[0113] In some embodiments, a refrigeration sensor 108 is provided in the cold storage compartment 1, and the refrigeration sensor 108 is used to detect the temperature of the cold storage compartment 1.

[0114] The controller is also configured to:

[0115] A fourth temperature detection value is obtained, wherein the fourth temperature detection value is the temperature value of the cold storage compartment detected by the cold storage sensor 108;

[0116] If the defrosting mode is the follow defrosting mode, a third termination rule is generated, wherein the third termination rule is that the fourth temperature detection value is greater than or equal to the fourth detection threshold.

[0117] When the defrost mode is set to Follow Defrost mode, a third termination rule is generated. For Follow Defrost mode, considering the additional heat input that may occur during defrosting in the freezer compartment, a higher temperature threshold can be set to ensure that the defrost termination can be correctly determined even in high-temperature environments.

[0118] For example, the fourth temperature threshold is 8. When the defrosting mode is follow defrosting, if the fourth temperature detection value is ≥8℃, the refrigeration fan 12 is turned off.

[0119] In defrosting mode, freezer compartment 2 has begun defrosting, while refrigerator compartment 1 simultaneously enters the defrosting process. At this time, the refrigerator fan 12 remains on to maintain a stable temperature within the refrigerator compartment. By monitoring temperature changes in the refrigerator compartment, it can be ensured that the temperature in refrigerator compartment 1 does not fluctuate excessively during the defrosting process, thus affecting the food preservation quality.

[0120] When the freezer compartment enters the defrosting phase, it may generate additional heat, which may also be transferred to the refrigerator compartment 1. By monitoring the temperature of the refrigerator compartment 1, defrosting can be stopped in time when the temperature of the refrigerator compartment 1 reaches or exceeds the set threshold, thus preventing the temperature of the refrigerator compartment 1 from becoming too high and affecting the refrigeration effect.

[0121] After defrosting, there is a delay period, such as 5 minutes after the refrigeration fan 12 is turned off, before returning to the normal refrigeration process.

[0122] During defrosting, the cooling capacity or airflow of the variable-temperature zone 17 can be dynamically adjusted based on temperature changes to compensate for the additional heat generated during defrosting. Through real-time adjustment, the temperature of the variable-temperature zone is ensured to remain within the set range, unaffected by the defrosting process.

[0123] In some embodiments, an auxiliary cooling device is provided in the temperature-changing zone 17;

[0124] After the controller executes the defrosting mode and obtains the second temperature detection value, it is specifically configured as follows:

[0125] A preset fluctuation range is defined as the target temperature fluctuation range of the variable temperature zone 17.

[0126] If the second temperature detection value exceeds the fluctuation range, a command is sent to the auxiliary cooling device to control the activation of the auxiliary cooling command.

[0127] Alternatively, a command can be sent to the refrigeration fan 12 to control the refrigeration fan 12 to increase its speed and open the refrigeration damper 103.

[0128] When the refrigerator enters defrost mode, the controller receives a defrost start signal and activates a temperature compensation mechanism. Based on the target temperature range and allowable fluctuation range (e.g., ±0.5℃) of the preset variable temperature zone 17, the controller dynamically adjusts the temperature according to these parameters. Control algorithms, such as PID control or fuzzy logic, can be used to predict future temperature trends based on real-time temperature data and take preventative measures to prevent the temperature from exceeding the set range.

[0129] If the temperature in variable temperature zone 17 rises beyond the fluctuation range by increasing the cooling capacity, the controller activates auxiliary cooling devices, such as a miniature evaporator or condenser, to provide additional cooling capacity. The cooling effect of the main evaporator is enhanced by adjusting the compressor's operating status or increasing the refrigerant flow.

[0130] In some embodiments, the auxiliary cooling device may include a micro evaporator, a condenser fan, a small compressor, and a thermoelectric cooling module, wherein the micro evaporator is a miniaturized evaporator used to locally enhance the cooling effect and can share the refrigerant circuit with the main evaporator.

[0131] A condenser fan is a small fan used to accelerate the condensation process, improving cooling efficiency. It can be placed near the condenser to help dissipate heat quickly and improve overall cooling performance. Its speed can be adjusted as needed to meet different cooling requirements. A small compressor is a low-power but fast-responding compressor used for auxiliary cooling. Its power is moderate, not significantly increasing energy consumption. It can start and stop quickly and respond promptly to temperature changes.

[0132] The thermoelectric cooling module utilizes the Peltier effect in electronic cooling devices, achieving heating or cooling by changing the direction of the current. It has no moving mechanical parts, operates quietly, is easy to maintain, and allows for precise temperature control, enabling rapid temperature adjustment within a small range.

[0133] Auxiliary cooling units can share the same refrigerant circuit as the main evaporator, enhancing cooling performance by increasing refrigerant flow or activating additional evaporators. Auxiliary cooling units can also utilize independent cooling mechanisms, directly absorbing heat without relying on refrigerant.

[0134] If the temperature shows an upward trend when the airflow is adjusted, the controller can increase the speed of the refrigeration fan 12 to accelerate the circulation of cold air and quickly remove excess heat. The refrigeration damper 103 or other airflow control systems ensure that cold air preferentially flows to the variable temperature zone, maintaining its low-temperature environment.

[0135] During defrosting, the controller continuously receives data from temperature sensor 111 to evaluate the effectiveness of temperature compensation. Based on real-time temperature changes, the controller automatically adjusts the cooling capacity or airflow to ensure that the temperature in the variable temperature zone remains within the set range. When defrosting is complete, the controller gradually returns to normal cooling mode and stops additional temperature compensation measures.

[0136] The dual-cycle refrigerator provided in this application is a refrigeration device. To achieve refrigeration and operation, it includes at least a refrigeration system, a cooling system, a control system, and a cabinet. The refrigeration system generates a refrigeration effect, the cooling system maintains a low-temperature environment, the control system controls the temperature and humidity inside the refrigerator, and the cabinet provides storage space. It is understood that the refrigeration system, cooling system, and control system include specific components capable of achieving the above functions.

[0137] In some embodiments, the refrigeration system includes a compressor, a condenser, an evaporator, and a throttling device. The compressor compresses the refrigerant gas, increasing its pressure and temperature, thereby propelling the refrigerant through the system. During compression, the refrigerant changes from a low-pressure, high-temperature gas to a high-pressure, high-temperature gas, thus producing a cooling effect. The condenser cools the high-temperature, high-pressure gas discharged from the compressor into a liquid state. Heat is released through heat sinks, and the refrigerant gas transforms into a liquid state, ready to enter the next step of the refrigeration cycle. The evaporator absorbs heat in the refrigeration system. The refrigerant evaporates from a liquid state to a gaseous state in the evaporator, absorbing heat from the surrounding environment, thereby lowering the internal temperature of the refrigerator. The throttling device may include an expansion valve and a capillary tube, used to regulate the refrigerant flow rate and reduce its pressure, making it a low-temperature, low-pressure gas-liquid mixture, ready to enter the evaporator.

[0138] In some embodiments, the cooling system includes a fan connected to the evaporator. The fan circulates air within compartments, such as the freezer and refrigerator compartments, transferring heat to the evaporator to help maintain a low-temperature environment inside the refrigerator.

[0139] It should be noted that the above examples are merely a simple division of refrigerator functions and do not limit the specific structural configuration of the refrigerator in the embodiments of this application.

[0140] Based on the above embodiments of the dual-cycle refrigerator, such as Figure 7 As shown, some embodiments of this application also provide a defrosting control method, including:

[0141] S100: Acquires cooling time, first temperature detection value, time interval, and defrosting status of the freezer compartment to generate a defrosting mode and turn on the refrigerator fan.

[0142] S200: Based on the defrosting mode, obtain the second temperature detection value.

[0143] S300: Generate a first termination rule to shut down the refrigeration fan by means of the first termination rule.

[0144] The cooling time is the continuous cooling time of the refrigerator compartment. The first temperature detection value is the first temperature value of the refrigerator evaporator 11 detected by the temperature sensor. The time interval is the time interval since the last refrigerator defrost. The defrost mode includes active defrost or follow-up defrost. The second temperature detection value is the temperature value of the variable temperature zone 17 detected by the variable temperature sensor 107. The first termination rule is that the second temperature detection value is greater than or equal to the first detection threshold.

[0145] The effects of the defrosting control method during operation can be found in the embodiments of the dual-cycle refrigerator described above, and will not be repeated here.

[0146] As can be seen from the above technical solutions, this application provides a dual-cycle refrigerator and a defrosting control method. The defrosting control method includes acquiring cooling time, a first temperature detection value, a time interval, and the defrosting state of the freezer compartment to generate a defrosting mode and turn on the refrigerator fan 12. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator 11 detected by the temperature sensor 111, the time interval is the time interval since the last refrigerator defrosting, and the defrosting mode includes active defrosting or follow-up defrosting. Based on the defrosting mode, a second temperature detection value is acquired, which is the temperature value of the variable temperature zone 17 detected by the variable temperature sensor 107. A first termination rule is generated to turn off the refrigerator fan 12, whereby the second temperature detection value is greater than or equal to a first detection threshold. This method enters a cooling state when the temperature of the variable temperature zone 17 exceeds a certain threshold, which can reduce temperature fluctuations and solve the problem of high temperature rise in the variable temperature zone.

[0147] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A dual-cycle refrigerator, characterized in that, include: The cabinet includes a refrigerator compartment and a freezer compartment; The cold storage compartment includes a cold storage evaporator, a cold storage fan, a variable temperature zone, a cold storage air duct assembly, and a temperature sensor; the freezer compartment includes a freezer evaporator and a freezer fan. The refrigerated air duct assembly includes a temperature sensor, which is used to detect the temperature of the temperature variable zone; The controller is configured as follows: The system acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turns on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by the temperature sensor, the time interval is the time interval since the last defrosting of the refrigerator compartment, and the defrosting mode includes a first active defrosting mode, a second active defrosting mode, and a follow-up defrosting mode. Different defrost termination rules are set based on the defrost mode, and the defrost termination rules include a first termination rule; A second temperature detection value is obtained, the second temperature detection value is the temperature value of the variable temperature zone detected by the variable temperature sensor, and when the second temperature detection value is greater than or equal to the first detection threshold, a first termination rule is generated to shut down the refrigeration fan through the first termination rule; The controller acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode, specifically configured as follows: If the cooling time is greater than the cooling time threshold and the first temperature detection value is less than the second detection threshold, a first active defrosting mode is generated, and the refrigerator compartment is controlled to enter the defrosting process. If the time interval is greater than or equal to the time interval threshold, a second active defrosting mode is generated, and the refrigerator compartment is controlled to enter the defrosting process; If the freezer compartment is in the defrosting process, generate a follow defrosting mode and control the refrigerator compartment to enter the defrosting process.

2. The dual-cycle refrigerator according to claim 1, characterized in that, The defrosting termination rule includes a second termination rule, and the controller is further configured to: Obtain a third temperature detection value, wherein the third temperature detection value is the third temperature value of the refrigeration evaporator detected by the temperature sensor; If the defrosting mode is a first active defrosting mode or a second active defrosting mode, a second termination rule is generated to shut down the refrigeration fan through the second termination rule. The second termination rule is that the third temperature detection value is greater than or equal to the third detection threshold.

3. The dual-cycle refrigerator according to claim 2, characterized in that, The cold storage room is equipped with a cold storage sensor, which is used to detect the temperature of the cold storage room; the defrosting end rule includes a third end rule. The controller is also configured to: Obtain a fourth temperature detection value, wherein the fourth temperature detection value is the temperature value of the cold storage compartment detected by the cold storage sensor; If the defrosting mode is a follow defrosting mode, a third termination rule is generated to shut down the refrigeration fan through the third termination rule. The third termination rule is that the fourth temperature detection value is greater than or equal to the fourth detection threshold.

4. The dual-cycle refrigerator according to claim 1, characterized in that, The refrigerated air duct assembly also includes a refrigerated mask and a refrigerated air duct. The refrigerated mask is provided with a plurality of first air outlets, which are connected to the variable temperature zone and are used to blow air into the variable temperature zone. The refrigeration air duct is equipped with multiple second air outlets, which are connected to the refrigeration compartment and are used to blow air into the refrigeration compartment. The refrigerated air duct is equipped with a refrigerated air door, and the refrigerated air door is provided with a first air outlet and a second air outlet. The first air outlet is connected to the refrigerated compartment, and the second air outlet is connected to the variable temperature zone. The controller is also configured to: Based on the defrosting mode, turn on the refrigeration fan and close the refrigeration damper.

5. The dual-cycle refrigerator according to claim 4, characterized in that, The refrigerated face shield is equipped with a return air vent, which is used to transfer heat from the refrigerated compartment and the variable temperature zone to the refrigerated evaporator.

6. The dual-cycle refrigerator according to claim 4, characterized in that, After the controller executes the generation of a first termination rule to shut down the refrigeration fan via the first termination rule, it is further configured to: Obtain a fifth temperature detection value, wherein the fifth temperature detection value is the second temperature value of the refrigeration evaporator detected by the temperature sensor; If the fifth temperature detection value is greater than the defrosting temperature threshold, the defrosting state is marked as the end state, and instructions are sent to the cold storage room, the variable temperature zone and the refrigeration fan to control the cold storage room and the variable temperature zone to issue a cooling request and to start the refrigeration fan. If the fifth temperature detection value is less than or equal to the defrosting temperature threshold, the defrosting state is marked as not completed, and a command is sent to the refrigeration damper to control the refrigeration damper to close.

7. The dual-cycle refrigerator according to claim 6, characterized in that, The controller is also configured to: A preset delay time is defined as the opening interval of the refrigeration damper. If the defrosting state is the end state, after the delay time, a command is sent to the refrigerator door to control the refrigerator door to open.

8. The dual-cycle refrigerator according to claim 4, characterized in that, An auxiliary cooling device is provided in the temperature-changing zone; After the controller executes the defrosting mode and obtains the second temperature detection value, it is specifically configured as follows: A preset fluctuation range is defined as the target temperature fluctuation range of the variable temperature zone. If the second temperature detection value exceeds the fluctuation range, an auxiliary cooling command is sent to the auxiliary cooling device to control the activation of the auxiliary cooling command. Alternatively, a command can be sent to the refrigeration fan to control it to increase its speed and open the refrigeration damper.

9. A defrosting control method, characterized in that, The method is applied to the dual-cycle refrigerator of claim 1, and the method includes: The system acquires the cooling time, the first temperature detection value, the time interval, and the defrosting status of the freezer compartment to generate a defrosting mode and turns on the refrigerator fan. The cooling time is the continuous cooling time of the refrigerator compartment, the first temperature detection value is the first temperature value of the refrigerator evaporator detected by the temperature sensor, the time interval is the time interval since the last defrosting of the refrigerator compartment, and the defrosting mode includes active defrosting or follow-up defrosting. Based on the defrosting mode, a second temperature detection value is obtained, which is the temperature value of the variable temperature zone detected by the variable temperature sensor. A first termination rule is generated to shut down the refrigeration fan, wherein the first termination rule is that the second temperature detection value is greater than or equal to a first detection threshold.

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