Double-circulation refrigerator and defrosting control method

Abstract

The invention provides a double-circulation refrigerator and a defrosting control method.The defrosting control method comprises the steps that refrigeration time, a first temperature detection value, a time interval and the defrosting state of a freezing chamber are obtained to generate a defrosting mode, a refrigeration fan is turned on, the refrigeration time is the continuous refrigeration time of a refrigeration chamber, and the first temperature detection value is the first temperature detection value; the first temperature detection value is a first temperature value, detected by a temperature sensor, of a refrigeration evaporator, the time interval is a time interval from last refrigeration defrosting, and the defrosting mode comprises active defrosting or follow-up defrosting; acquiring a second temperature detection value based on the defrosting mode, wherein the second temperature detection value is a temperature value of a variable temperature area detected by a variable temperature sensor; a first ending rule is generated, the refrigeration fan is turned off according to the first ending rule, and the first ending rule is that the second temperature detection value is larger than or equal to the first detection threshold value. According to the method, when the temperature of the variable-temperature area is larger than a certain threshold value, the refrigeration state is started, temperature fluctuation can be reduced, and the problem that the temperature rise of the special variable-temperature area is high is solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a double-circulation refrigerator and a defrosting control method. Background Art

[0002] The dual-circulation refrigerator provides the required cooling capacity for the refrigerator and freezer through independent refrigeration systems, thereby achieving more precise temperature control and better food preservation. The dual-circulation refrigerator not only improves energy efficiency, but also reduces the cross-odor between the refrigerator and freezer, improving the user experience.

[0003] For the defrosting control process of the dual-circulation refrigerator, timed defrosting or temperature-sensing defrosting can be used to monitor the temperature changes in the freezer to determine when to defrost. For the variable temperature area in the dual-circulation refrigerator, the variable temperature area can be constructed as a relatively isolated space to minimize the impact of temperature fluctuations during the defrosting process on the internal environment of the area. For example, the variable temperature area is designed in the form of a sealed cabin to reduce the heat exchange between the area and the external refrigeration compartment.

[0004] However, during the defrosting period, the return air path of the variable temperature zone is still connected to the refrigerated compartment, which affects the sealing of the zone and fails to achieve the effect of reducing the temperature rise, resulting in a higher temperature rise in the variable temperature zone. Summary of the invention

[0005] The present application provides a dual-circulation refrigerator and a defrost control method to solve the problem of high temperature rise in a temperature-changing zone.

[0006] In a first aspect, the present application provides a dual-circulation refrigerator, comprising:

[0007] A box body, the box body comprising a refrigerating compartment and a freezing compartment;

[0008] The refrigerating compartment includes a refrigerating evaporator, a refrigerating fan, a temperature-changing zone, a refrigerating air duct assembly and a temperature sensor, and the freezing compartment includes a freezing evaporator and a freezing fan;

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

[0010] The controller is configured as:

[0011] Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode, and turn on the refrigeration fan, the refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrosting, and the defrosting mode includes active defrosting or follow-up defrosting;

[0012] Based on the defrost mode, a second temperature detection value is obtained, where the second temperature detection value is a temperature value of a temperature changing zone detected by a temperature changing sensor;

[0013] A first termination rule is generated to shut down the refrigeration fan according to the first termination rule, 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 defrost mode includes a first active defrost mode, a second active defrost mode and a follow-up defrost mode;

[0015] The controller acquires the refrigeration time, the first temperature detection value, the time interval, and the defrosting state of the freezing chamber to generate a defrosting mode, and is specifically configured as follows:

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

[0018] If the defrosting state of the freezing compartment is that it has entered the defrosting process, a follow-up defrosting mode is generated, and the refrigerating compartment is controlled to enter the defrosting process.

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

[0020] Based on the defrost mode, obtaining a third temperature detection value, wherein the third temperature detection value is a third temperature value of the refrigeration evaporator detected by a temperature sensor;

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

[0022] In some feasible embodiments, a refrigeration sensor is provided in the refrigeration compartment, and the refrigeration sensor is used to detect the temperature of the refrigeration compartment;

[0023] The controller is also configured to:

[0024] Acquire a fourth temperature detection value, where the fourth temperature detection value is a temperature value of the refrigeration compartment detected by the refrigeration sensor;

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

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

[0027] The refrigeration air duct is provided with a plurality of second air outlets, and the second air outlets are connected to the refrigeration compartment and are used to blow air into the refrigeration compartment;

[0028] The refrigeration air duct is provided with a refrigeration air door, and the refrigeration air door is provided with a first air outlet and a second air outlet, the first air outlet is connected to the refrigeration compartment, and the second air outlet is connected to the temperature changing area;

[0029] The controller is also configured to:

[0030] Based on the defrost mode, the refrigeration fan is turned on and the refrigeration damper is closed.

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

[0032] In some feasible embodiments, after the controller generates the first termination rule to shut down the refrigeration fan according to the first termination rule, the controller is further configured to:

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

[0034] If the fifth temperature detection value is greater than the defrost temperature threshold, the defrost state is marked as an end state, and instructions are sent to the refrigerated compartment, the temperature-changing zone, and the refrigeration fan to control the refrigerated compartment and the temperature-changing zone to issue a refrigeration request, and the refrigeration fan is started;

[0035] If the fifth temperature detection value is less than or equal to the defrost temperature threshold, the defrost state is marked as an unfinished state, and an instruction 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, wherein the delay time is 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 refrigeration damper to control the refrigeration damper 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, the controller is specifically configured as follows:

[0041] A preset fluctuation range, wherein the fluctuation range is a target temperature fluctuation range of the temperature changing zone;

[0042] If the second temperature detection value exceeds the fluctuation range, an instruction is sent to the auxiliary cooling device to control the auxiliary cooling instruction to start,

[0043] Or, send a command to the refrigeration fan to control the refrigeration fan to increase the speed and open the refrigeration damper.

[0044] In a second aspect, the present application provides a defrost control method, comprising:

[0045] Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode, and turn on the refrigeration fan, the refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrosting, and the defrosting mode includes active defrosting or follow-up defrosting;

[0046] Based on the defrost mode, a second temperature detection value is obtained, where the second temperature detection value is a temperature value of a temperature changing zone detected by a temperature changing sensor;

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

[0048] It can be seen from the above technical solutions that the present application provides a dual-circulation refrigerator and a defrost control method, the defrost control method includes obtaining the refrigeration time, the first temperature detection value, the time interval and the defrost state of the freezer to generate a defrost mode and turn on the refrigeration fan, wherein the refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrost, and the defrost mode includes active defrost or follow-up defrost; based on the defrost mode, the second temperature detection value is obtained, and the second temperature detection value is the temperature value of the variable temperature zone detected by the variable temperature sensor; the first end rule is generated to turn off the refrigeration fan through the first end rule, and the first end rule is that the second temperature detection value is greater than or equal to the first detection threshold. When the temperature of the variable temperature zone is greater than a certain threshold, the method enters the refrigeration state, which can reduce the temperature fluctuation to solve the problem of high temperature rise in the variable temperature zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] Figure 1 A schematic diagram of the structure of a dual-circulation refrigerator provided in an embodiment of the present application;

[0051] Figure 2 A schematic diagram of the structure of the fans and evaporators of the freezing compartment and the refrigerating compartment provided in the embodiment of the present application;

[0052] Figure 3 A schematic diagram of the structure of a refrigerated compartment provided in an embodiment of the present application;

[0053] Figure 4 A side view of a refrigerated compartment provided in an embodiment of the present application;

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

[0055] Figure 6 An exploded view of a refrigeration air duct assembly provided in an embodiment of the present application;

[0056] Figure 7 A schematic flow chart of a defrost control method provided in an embodiment of the present application.

[0057] Illustration Description:

[0058] Among them, 01-cabinet, 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 mask, 1011-second air outlet, 1012-return air outlet, 102-refrigerated air duct, 1021-first air outlet, 103-refrigerated air door, 1031-first air outlet, 1032-second air outlet, 104-viscosity sponge, 105-air duct cover, 106-aluminum foil sponge, 107-variable temperature sensor, 108-refrigerated sensor. DETAILED DESCRIPTION

[0059] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0060] The dual-circulation air-cooled refrigerator has two independent refrigeration systems, including two evaporators, two fans and two compressors. Each refrigeration system operates independently to control the temperature of the refrigerator and freezer respectively. At the same time, the air-cooling technology makes the cold air circulation inside the refrigerator more uniform, avoiding possible temperature fluctuations and frost problems.

[0061] During the defrosting process of a dual-circulation air-cooled refrigerator, the evaporator of the refrigerating compartment or the freezing compartment will be heated to melt the frost layer, and the heating process will cause the temperature of the surrounding environment to rise. If there is heat exchange between the variable temperature area and the refrigerating compartment during the defrosting period, for example, they are connected through the return air path, then the variable temperature area will be affected by the temperature rise of the refrigerating compartment, causing its internal temperature to rise.

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

[0063] Although the temperature-changing area is constructed as a relatively isolated space, such as a sealed cabin, in actual use, there may be problems such as poor sealing or aging of sealing materials. These problems will cause the outside hot air to enter the temperature-changing area, or during the defrosting period, the hot air in the refrigerated compartment will more easily enter the temperature-changing area through the gaps, thereby increasing its temperature.

[0064] If the defrost control strategy of the refrigerator is not accurate or reasonable, such as the defrost time is too long, the defrost temperature is too high, etc., the temperature of the refrigerated compartment and the variable temperature area will rise. Especially during the defrost period, if the temperature fluctuation of the refrigerated compartment is not effectively controlled, then this fluctuation will be transmitted to the variable temperature area through the return air path, thus affecting its temperature stability.

[0065] In order to solve the problem of high temperature rise in the temperature-changing zone, some embodiments of the present application provide a dual-circulation refrigerator, such as Figure 1-Figure 6 As shown, it includes: a box body 01, the box body 01 is connected to the door body 02, the box body 01 includes a refrigeration compartment 1 and a freezer compartment 2, which are used to store food with different temperature requirements. The refrigeration compartment 1 can be set at about 4°C, which is suitable for preserving food, and the freezer compartment 2 is kept below -18°C for long-term storage of food.

[0066] A plurality of shelves 15 are arranged in the cold storage compartment 1, including a cold storage evaporator 11, a cold storage fan 12, a temperature variable 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, which lowers the ambient air temperature by absorbing heat through the evaporation of the refrigerant. As a part of the refrigeration cycle, the refrigerant absorbs heat and vaporizes when flowing through the cold storage evaporator 11.

[0067] The refrigeration fan 12 is a device for promoting air circulation, which evenly distributes cold air into the refrigeration compartment 1 to ensure temperature consistency and rapid cooling. The variable temperature zone 17 is a functional area in the refrigeration compartment 1, which can be adjusted to a temperature range different from the conventional refrigeration temperature. Users can adjust the storage conditions of specific foods as needed.

[0068] The temperature changing area 17 may be a drawer structure. In addition to the temperature changing area 17 being a drawer, other drawers may also be included. In this embodiment, a first drawer 16 and a second drawer may also be included. Figure 3 As shown, the first drawer 16 is arranged above the temperature changing zone 17. In one embodiment, the temperature changing zone 17 is two drawers. In another embodiment, the temperature changing zone 17 can be a drawer arranged on the right side, and the drawer on the left side is the second drawer.

[0069] It is understandable that the first drawer 16 and the second drawer are non-temperature-variable areas, that is, the temperature cannot be adjusted, and their temperatures can be the same as the temperature of the refrigerating compartment 1 . The first drawer 16 and the second drawer are regulated by adjusting the temperature of the refrigerating compartment 1 .

[0070] The refrigeration air duct assembly 10 includes a variable temperature sensor 107, which is located in the variable temperature zone 17, and a temperature sensor 111 for monitoring temperature changes in the variable temperature zone 17. The variable temperature sensor 107 provides the controller with temperature data of the variable temperature zone 17 for precise regulation.

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

[0072] The refrigeration air duct 102 is arranged in the refrigeration mask 101, and is used to guide and distribute cold air. The refrigeration air duct 102 is used to transport cold air to the refrigeration compartment 1, and a plurality of second air outlets 1011 are arranged on the refrigeration air duct 102. The second air outlets 1011 are connected to the refrigeration compartment 1, and are used to blow air into the refrigeration compartment 1, so as to improve the uniformity of air distribution in the refrigeration compartment 1.

[0073] In addition, a refrigeration damper 103 is provided on the refrigeration air duct 102. The refrigeration damper 103 is a valve device provided on the refrigeration air duct 102 and is used to adjust the air flow in different directions. The refrigeration damper 103 is provided with a first air port 1031 and a second air port 1032. The first air port 1031 is connected to the refrigeration compartment 1 to allow cold air to flow into the refrigeration compartment 1 as required. The second air port 1032 is connected to the variable temperature zone 17 and can be closed during defrosting or other specific conditions to isolate the variable temperature zone 17 and prevent unnecessary heat transfer. By controlling the state of the two air ports, the air flow distribution between the refrigeration compartment 1 and the variable temperature zone 17 can be flexibly adjusted to ensure effective refrigeration of the refrigeration compartment 1 and maintain the temperature condition of the variable temperature zone 17.

[0074] A viscose sponge 104 is also provided at the back of the refrigeration air duct 102. The viscose sponge 104 is used to form a complete air path circulation and play a sealing and isolating role. An air duct cover 105 is provided outside the refrigeration air duct 102 to seal and protect the internal structure. An aluminum foil sponge 106 is provided between the air duct cover 105 and the outside of the refrigeration air duct 102. The aluminum foil sponge 106 is used as a heat insulation layer to maintain the temperature of the cold air and reduce heat conduction losses.

[0075] In some embodiments, the refrigeration mask 101 is provided with a return air port 1012, which is used to transfer the heat of the refrigeration compartment 1 and the temperature-changing zone 17 to the refrigeration evaporator 11. The first air port 1031 and the second air port 1032 use the refrigeration fan 12 to transfer the cold energy generated by the refrigeration evaporator 11 to the inside of the refrigeration compartment 1 and the temperature-changing zone 17 to reduce the temperature. The heat of the refrigeration compartment 1 and the temperature-changing zone 17 returns to the bottom of the refrigeration evaporator 11 through the return air port 1012 at the bottom of the refrigeration mask 101 for heat exchange.

[0076] The freezing chamber 2 includes a freezing evaporator 13 and a freezing fan 14, wherein the freezing evaporator 13, like the refrigerating evaporator 11, provides cooling capacity for the freezing chamber; and the freezing fan 14, like the refrigerating fan 12, is a device for promoting air circulation.

[0077] The controller is configured as:

[0078] Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode and turn on the refrigeration fan;

[0079] Based on the defrost mode, a second temperature detection value is obtained, where the second temperature detection value is a temperature value of the temperature changing zone detected by the temperature changing sensor;

[0080] A first termination rule is generated to shut down the refrigeration fan according to the first termination rule, and the first termination rule is that the second temperature detection value is greater than or equal to a first detection threshold.

[0081] The refrigeration time is the continuous refrigeration time of the refrigerating chamber, the first temperature detection value is the first temperature value of the refrigerating evaporator 11 detected by the temperature sensor 111, and the time interval is the time interval from the last refrigeration and defrosting.

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

[0083] In the exemplary first active defrosting mode, if the continuous refrigeration time of the refrigerating chamber is ≥ 90 minutes, and the first temperature value of the refrigerating evaporator 11 detected by the temperature sensor 111 is less than 1°C, the refrigerating chamber defrosting process is forced to start. In the exemplary second active defrosting mode, if the time from the last refrigeration defrosting start time is ≥ 5 hours in the non-energy consumption and non-temperature storage state, the refrigerating chamber defrosting process is forced to start.

[0084] If the defrost status of the freezer compartment is that it has entered the defrost process, a follow-defrost mode is generated, that is, when the freezer compartment enters the defrost process, the refrigeration compartment enters the defrost process synchronously.

[0085] When entering the defrost process according to different defrost modes, the refrigeration request of the refrigerating compartment 1 and the variable temperature zone 17 is ignored during the defrosting of the refrigerating compartment 1, the freezing compartment 2 can be refrigerated normally, and the refrigerating fan 12 is turned on, and the refrigerating damper 103 is closed to accelerate the air circulation in the refrigerating compartment 1 and improve the defrosting efficiency.

[0086] During the defrosting period, the refrigerating fan 12 is turned on to maintain the air flow in the refrigerating compartment 1, which helps to evenly distribute the temperature and prevent the local temperature from being too high or too low. The operation of the refrigerating fan 12 helps to transfer the heat in the refrigerating compartment to the refrigerating evaporator 11 more quickly, accelerating the melting of the frost layer. Although the refrigerating compartment is not refrigerating at this time, the operation of the refrigerating fan 12 helps to restore the temperature of the refrigerating compartment 1 more quickly after the defrosting is completed, reducing the impact of temperature fluctuations on food preservation.

[0087] Different defrosting end rules are set based on different defrosting modes. However, if the temperature detected by the variable temperature sensor 107, that is, the temperature of the variable temperature zone 17 is greater than or equal to the first detection threshold, the defrosting process can be ended, wherein the first detection threshold is 3, that is, if the temperature of the variable temperature zone 17 is ≥3°C, a command is sent to the refrigeration fan 12 to control the refrigeration fan 12 to turn off. After the defrosting is completed, after a delay period, for example, 5 minutes after the refrigeration fan 12 is turned off, the normal refrigeration process is returned.

[0088] In some embodiments, after generating a first end rule to shut down the refrigeration fan 12 through the first end rule, a fifth temperature detection value can also be obtained, and 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 defrost temperature threshold, the defrost 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 refrigeration request, and the refrigeration fan 12 to start.

[0089] When the variable 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 and the temperature is rising during the defrosting process. At the same time, the controller will determine whether the defrosting has been completed based on the data detected by the temperature sensor 111, that is, the fifth temperature detection value.

[0090] The temperature sensor 111 can be judged in a variety of ways. For example, when the evaporator begins to defrost, as the frost melts, the surface temperature of the evaporator will gradually rise. If the temperature sensor 111 detects that the temperature continues to rise and exceeds a threshold value, such as 4°C or higher, it can be judged that the defrosting process is nearing the end. For another example, after the defrosting is completed, there is no more frost on the surface of the evaporator to hinder heat conduction, and the temperature will tend to stabilize within a certain range. A stable time period can be set, that is, when the evaporator temperature reaches the threshold, it remains relatively stable for a period of time, such as 5 minutes, indicating that the defrosting has been completed. In order to avoid unnecessary energy waste caused by excessive defrosting, it can also be judged by the maximum allowable defrosting time. If the defrosting process reaches the set maximum time limit, even if the temperature is not completely stable, it will indicate the end of the defrosting to prevent excessively long heating operations.

[0091] If the fifth temperature detection value is less than or equal to the defrost temperature threshold, the defrost state is marked as an unfinished state, and an instruction is sent to the refrigeration damper 103 to control the refrigeration damper 103 to be in a closed state. Closing the refrigeration damper 103 can reduce the interference of outside air on the temperature of the refrigeration compartment 1, ensuring that the defrost process can proceed smoothly.

[0092] In addition to determining whether to end the defrost process through the variable temperature sensor 107, it can also be determined through the detection result of the temperature sensor 111. Since the defrost mode includes an active defrost mode and a follow-up defrost mode, the detection threshold is different when the defrost mode is an active defrost mode and when the defrost mode is a follow-up defrost mode.

[0093] After defrosting is completed, the return air path of the temperature-changing 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 temperature-changing zone 17.

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

[0095] A preset delay time, wherein the delay time is 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 refrigeration damper to control the refrigeration damper to open.

[0097] If the fifth temperature detection value is greater than the defrost temperature threshold, the defrost state is marked as the end state, and the controller has a built-in fixed delay time, such as 5 minutes, and automatically starts the timer after confirming that the defrost is over. The delay time can also be dynamically adjusted according to actual conditions, such as ambient temperature, defrost duration, etc., to ensure the best effect.

[0098] First, multi-parameter monitoring can be performed, and the parameters may include ambient temperature, defrost duration, evaporator humidity, and refrigerated compartment 1 temperature; the ambient temperature can be monitored in real time by a temperature sensor 111 installed outside or inside the refrigerator. The defrost duration can be recorded by recording the duration of each defrost process as an important reference for adjusting the delay time. The evaporator humidity can use a humidity sensor to monitor the humidity level on the evaporator surface to ensure that it is dry before restoring the return air path. The refrigerated compartment 1 temperature can be evaluated by monitoring the temperature changes in the refrigerated compartment 1 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 current status. Based on preset rules and logical judgments, the delay time is dynamically adjusted by taking into account multiple parameters. For example: If the ambient temperature is high, the delay time can be appropriately extended to ensure that the evaporator is fully dried. If the defrost duration is short, the delay time can be shortened to quickly resume normal cooling. If the evaporator humidity is high, keep a longer delay time to ensure thorough drying.

[0100] It also allows users to set the default value or adjustment range of the delay time in the application or control panel according to their own needs and habits. It can provide a variety of preset scene modes, such as energy saving mode and quick recovery mode. Users can choose the mode that suits the current situation and the delay time will be automatically adjusted.

[0101] For high temperature environments, when the outside ambient temperature is high, the evaporator surface may take longer to completely dry. When the ambient temperature is detected to exceed a certain threshold, for example, 30°C, the delay time is automatically increased, for example, from 5 minutes to 8 minutes, to ensure that the evaporator is completely dry and prevent residual moisture from causing secondary frost.

[0102] For low temperature environments, the evaporator surface dries faster in cold environments. 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 defrost cycles, if the defrost process is very fast, for example, less than 10 minutes, it means that there is less frost on the evaporator and the drying time is also shorter. Shorten the delay time according to the defrost duration, for example, from 5 minutes to 3 minutes, to improve efficiency and quickly resume normal refrigeration.

[0104] For long defrost cycles, if the defrost process is longer, for example, more than 20 minutes, it indicates that there is more frost on the evaporator and it needs more time to dry. Increase the delay time according to the duration of defrost, for example, from 5 minutes to 7 minutes, to ensure that the evaporator surface is completely dry to avoid re-frost.

[0105] In the case of high evaporator humidity, if the evaporator surface humidity is still high after defrosting, it indicates incomplete drying. If the evaporator humidity is detected to exceed a certain threshold, such as 60%, the delay time is automatically extended, for example, from 5 minutes to 10 minutes, to ensure that the evaporator is completely dried.

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

[0107] During the delay period, the refrigeration damper 103 remains closed to isolate the airflow exchange between the temperature-changing zone 17 and the refrigerated compartment 1. After the delay period, the refrigeration damper 103 gradually opens to slowly restore the return air path to avoid sudden airflow shock. By delaying the restoration of the return air path, the heat shock caused by the immediate restoration of the return air after defrosting can be alleviated, and the risk of temperature rise in the temperature-changing zone can be reduced. During the delay period, the temperature in the temperature-changing zone 17 can continue to remain stable, unaffected by external heat, and maintain ideal storage conditions.

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

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

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

[0111] When the defrost mode is the first active defrost mode or the second active defrost mode, a second end rule is generated. The second end rule is used for actively triggered defrost conditions, which means that the frost on the evaporator surface has been cleared, the temperature has returned to a safe level, and normal refrigeration can be resumed.

[0112] Exemplarily, the third temperature threshold is 4. When the defrost mode is active defrost, the third temperature detection value is ≥ 4° C., and the refrigeration fan 12 is turned off.

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

[0114] The controller is also configured to:

[0115] Acquire a fourth temperature detection value, where the fourth temperature detection value is a temperature value of the refrigeration compartment detected by the refrigeration sensor 108;

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

[0117] When the defrost mode is the follow-up defrost mode, the third end rule is generated. For the follow-up defrost mode, considering the additional heat input that may be caused by the defrosting of the freezer, a higher temperature threshold can be set to ensure that the end of defrosting can be correctly judged even in a high temperature environment.

[0118] Exemplarily, the fourth temperature threshold is 8. When the defrost mode is follow-defrost, the fourth temperature detection value is ≥ 8° C., and the refrigeration fan 12 is turned off.

[0119] In the follow-defrost mode, the freezer compartment 2 has started to defrost, and the refrigerating compartment 1 enters the defrosting process simultaneously. At this time, the refrigerating fan 12 remains on to maintain the temperature in the refrigerating compartment stable. By monitoring the temperature change of the refrigerating compartment, it can be ensured that the temperature in the refrigerating compartment 1 will not fluctuate excessively due to the defrosting process, which will affect the food preservation quality.

[0120] When the freezer enters defrosting mode, additional heat may be generated, which may also be transferred to the refrigerating compartment 1. By monitoring the temperature of the refrigerating compartment 1, the defrosting can be terminated in time when the temperature of the refrigerating compartment 1 reaches or exceeds the set threshold, so as to avoid the refrigerating compartment 1 being too high and affecting the refrigeration effect.

[0121] After defrosting is completed, after a delay period, for example, 5 minutes after the refrigeration fan 12 is turned off, the normal refrigeration process is returned.

[0122] During defrosting, according to the temperature change of the temperature-changing zone 17, the cooling capacity or air volume can be dynamically adjusted to compensate for the extra heat generated by defrosting. Through real-time adjustment, the temperature of the temperature-changing zone is always kept within the set range and is not affected 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, the controller is specifically configured as follows:

[0125] A preset fluctuation range, which is a target temperature fluctuation range of the temperature-changing zone 17;

[0126] If the second temperature detection value exceeds the fluctuation range, an instruction is sent to the auxiliary cooling device to control the auxiliary cooling instruction to start,

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

[0128] When the refrigerator enters the defrost mode, the controller receives a defrost start signal and starts the temperature compensation mechanism, based on the target temperature range and the allowable fluctuation range of the preset temperature variable zone 17, such as ±0.5°C, and dynamically adjusts according to these parameters. A control algorithm, such as PID control, fuzzy logic, etc., can be used to predict future temperature trends based on real-time temperature data, and take measures in advance to prevent the temperature from exceeding the set range.

[0129] If the temperature of the variable temperature zone 17 rises beyond the fluctuation range by increasing the cooling capacity, the controller activates the auxiliary cooling device, such as a micro evaporator or condenser, to provide additional cooling capacity. The refrigeration effect of the main evaporator is enhanced by adjusting the working state of the compressor 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 a refrigerant circuit with the main evaporator.

[0131] Condenser fan is a small fan used to accelerate the condensation process and improve cooling efficiency. It can be set near the condenser to help dissipate heat quickly and improve overall cooling performance. The speed can be adjusted as needed to meet different cooling needs. A small compressor is a small compressor with low power but fast response. It is used to assist cooling. It has moderate power and will not significantly increase energy consumption. It can be started and stopped quickly and can respond to temperature changes in a timely manner.

[0132] Thermoelectric cooling modules use Peltier effect electronic cooling devices to achieve heating or cooling by changing the direction of current. There are no mechanical moving parts, so it runs quietly and is easy to maintain. It can also accurately control the temperature and achieve rapid temperature adjustment in a small range.

[0133] Auxiliary chillers can share the same refrigerant circuit as the main evaporator, increasing the cooling effect by increasing the refrigerant flow or activating an additional evaporator. Auxiliary chillers can use an independent cooling mechanism to absorb heat directly without relying on refrigerant.

[0134] If the temperature tends to rise by adjusting the air volume, the controller can increase the speed of the refrigeration fan 12 to speed up the circulation of cold air and quickly take away the excess heat. Through the refrigeration damper 103 or other airflow control system, ensure that the cold air flows to the temperature-changing area first to maintain its low temperature environment.

[0135] During the defrosting process, the controller continuously receives data from the temperature sensor 111 to evaluate the effect of temperature compensation. According to the real-time temperature change, the controller automatically adjusts the cooling capacity or air volume to ensure that the temperature of the variable temperature zone is always kept within the set range. When the defrosting is completed, the controller gradually returns to the normal cooling mode and stops the additional temperature compensation measures.

[0136] The dual-circulation refrigerator provided in the embodiment of the present application is a refrigeration device, which at least includes a refrigeration system, a cooling system, a control system and a cabinet to achieve refrigeration and operation. Among them, the refrigeration system is used to produce a refrigeration effect, the cooling system is used to maintain a low-temperature environment, the control system is used to control the temperature and humidity in the refrigerator, etc., and the cabinet is used to provide storage space. It can be understood that the refrigeration system, the cooling system, and the control system include specific components that can achieve the above functions.

[0137] In some embodiments, the refrigeration system includes a compressor, a condenser, an evaporator, and a throttling device. Among them, the compressor is used to compress the refrigerant gas, increase the pressure and temperature, and thus promote the flow of the refrigerant in the system. During the compression process, the refrigerant changes from a low-pressure and high-temperature gas to a high-pressure and high-temperature gas, thereby producing a refrigeration effect. The condenser is used to cool the high-temperature and high-pressure gas discharged from the compressor into a liquid state. The heat is released through the heat sink, and the refrigerant gas is converted into a liquid state, ready to enter the next step of the refrigeration cycle. The evaporator is used to absorb heat in the refrigeration system. The refrigerant evaporates from a liquid state to a gas state in the evaporator, absorbing heat from the surrounding environment, thereby achieving the purpose of lowering the temperature inside the refrigerator. The throttling device may include an expansion valve and a capillary tube, which are used to adjust the flow rate of the refrigerant, reduce its pressure, and make it become a low-temperature and low-pressure gas-liquid mixed state, ready to enter the evaporator.

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

[0139] It should be noted that the above example is merely a simple division of the functions of the refrigerator and does not constitute a limitation on the specific structure of the refrigerator in the embodiment of the present application.

[0140] Based on the above-mentioned double-circulation refrigerator embodiment, as Figure 7 As shown, some embodiments of the present application also provide a defrosting control method, including:

[0141] S100: Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode and turn on the refrigeration fan.

[0142] S200: Based on the defrost mode, obtaining a second temperature detection value.

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

[0144] The refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator 11 detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrosting, the defrosting mode includes active defrosting or follow-up defrosting, the second temperature detection value is the temperature value of the variable temperature zone 17 detected by the variable temperature sensor 107, and the first end rule is that the second temperature detection value is greater than or equal to the first detection threshold.

[0145] The effects of the defrost control method during operation can refer to the effects of the above-mentioned double-circulation refrigerator embodiment, which will not be described in detail here.

[0146] As can be seen from the above technical solutions, the present application provides a dual-circulation refrigerator and a defrost control method, the defrost control method includes obtaining the refrigeration time, the first temperature detection value, the time interval and the defrost state of the freezer compartment to generate a defrost mode and turn on the refrigeration fan 12, wherein the refrigeration time is the continuous refrigeration time of the refrigeration compartment, the first temperature detection value is the first temperature value of the refrigeration evaporator 11 detected by the temperature sensor 111, the time interval is the time interval from the last refrigeration defrost, and the defrost mode includes active defrost or follow-up defrost; based on the defrost mode, the second temperature detection value is obtained, the second temperature detection value is the temperature value of the variable temperature zone 17 detected by the variable temperature sensor 107; a first end rule is generated to turn off the refrigeration fan 12 through the first end rule, the first end rule is that the second temperature detection value is greater than or equal to the first detection threshold. When the temperature of the variable temperature zone 17 is greater than a certain threshold, the method enters the refrigeration state, which can reduce the temperature fluctuation to solve the problem of high temperature rise in the variable temperature zone.

[0147] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A dual-circulation refrigerator, characterized in that: include: A box body, the box body comprising a refrigerating compartment and a freezing compartment; The refrigerating compartment includes a refrigerating evaporator, a refrigerating fan, a temperature-changing zone, a refrigerating air duct assembly and a temperature sensor, and the freezing compartment includes a freezing evaporator and a freezing fan; The refrigeration air duct assembly includes a variable temperature sensor, and the variable temperature sensor is used to detect the temperature of the variable temperature zone; The controller is configured as: Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode, and turn on the refrigeration fan, the refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrosting, and the defrosting mode includes active defrosting or follow-up defrosting; Based on the defrost mode, a second temperature detection value is obtained, where the second temperature detection value is a temperature value of a temperature changing zone detected by a temperature changing sensor; A first termination rule is generated to shut down the refrigeration fan according to the first termination rule, wherein the first termination rule is that the second temperature detection value is greater than or equal to a first detection threshold.

2. The dual-circulation refrigerator according to claim 1, characterized in that: The defrost modes include a first active defrost mode, a second active defrost mode and a follow-up defrost mode; The controller acquires the refrigeration time, the first temperature detection value, the time interval, and the defrosting state of the freezing chamber to generate a defrosting mode, and is specifically configured as follows: If the refrigeration time is greater than the refrigeration time threshold, and the first temperature detection value is less than the second detection threshold, a first active defrosting mode is generated, and the refrigerated 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 refrigerated compartment is controlled to enter the defrosting process; If the defrosting state of the freezing compartment is that it has entered the defrosting process, a follow-up defrosting mode is generated, and the refrigerating compartment is controlled to enter the defrosting process.

3. The dual-circulation refrigerator according to claim 2, characterized in that: The controller is also configured to: Based on the defrost mode, obtaining a third temperature detection value, wherein the third temperature detection value is a third temperature value of the refrigeration evaporator detected by a temperature sensor; If the defrost mode is the first active defrost mode or the second active defrost mode, a second termination rule is generated, and the second termination rule is that the third temperature detection value is greater than or equal to a third detection threshold.

4. The dual-circulation refrigerator according to claim 3, characterized in that: A refrigeration sensor is arranged in the refrigeration compartment, and the refrigeration sensor is used to detect the temperature of the refrigeration compartment; The controller is also configured to: Acquire a fourth temperature detection value, where the fourth temperature detection value is a temperature value of the refrigeration compartment detected by the refrigeration sensor; If the defrost mode is the follow-up defrost mode, a third termination rule is generated, and the third termination rule is that the fourth temperature detection value is greater than or equal to a fourth detection threshold.

5. The dual-circulation refrigerator according to claim 1, characterized in that: The refrigeration air duct assembly further includes a refrigeration mask and a refrigeration air duct, wherein the refrigeration mask is provided with a plurality of first air outlets, wherein the first air outlets are connected to the temperature-changing zone and are used to blow air into the temperature-changing zone; The refrigeration air duct is provided with a plurality of second air outlets, and the second air outlets are connected to the refrigeration compartment and are used to blow air into the refrigeration compartment; The refrigeration air duct is provided with a refrigeration air door, and the refrigeration air door is provided with a first air outlet and a second air outlet, the first air outlet is connected to the refrigeration compartment, and the second air outlet is connected to the temperature changing area; The controller is also configured to: Based on the defrost mode, the refrigeration fan is turned on and the refrigeration damper is closed.

6. The dual-circulation refrigerator according to claim 5, characterized in that: The refrigeration mask is provided with a return air port, and the return air port is used to transfer the heat of the refrigeration compartment and the temperature changing zone to the refrigeration evaporator.

7. The dual-circulation refrigerator according to claim 5, characterized in that: After the controller generates the first termination rule to shut down the refrigeration fan according to the first termination rule, the controller is further configured to: acquiring a fifth temperature detection value, wherein the fifth temperature detection value is a second temperature value of the refrigeration evaporator detected by the temperature sensor; If the fifth temperature detection value is greater than the defrost temperature threshold, the defrost state is marked as an end state, and instructions are sent to the refrigerated compartment, the temperature-changing zone, and the refrigeration fan to control the refrigerated compartment and the temperature-changing zone to issue a refrigeration request, and the refrigeration fan is started; If the fifth temperature detection value is less than or equal to the defrost temperature threshold, the defrost state is marked as an unfinished state, and an instruction is sent to the refrigeration damper to control the refrigeration damper to close.

8. The dual-circulation refrigerator according to claim 7, characterized in that: The controller is also configured to: A preset delay time, wherein the delay time is 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 refrigeration damper to control the refrigeration damper to open.

9. The dual-circulation refrigerator according to claim 5, 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, the controller is specifically configured as follows: A preset fluctuation range, wherein the fluctuation range is a target temperature fluctuation range of the temperature changing zone; If the second temperature detection value exceeds the fluctuation range, an instruction is sent to the auxiliary cooling device to control the auxiliary cooling instruction to start, Or, send a command to the refrigeration fan to control the refrigeration fan to increase the speed and open the refrigeration damper.

10. A defrosting control method, characterized in that: include: Acquire the refrigeration time, the first temperature detection value, the time interval and the defrosting state of the freezing chamber to generate a defrosting mode, and turn on the refrigeration fan, the refrigeration time is the continuous refrigeration time of the refrigeration chamber, the first temperature detection value is the first temperature value of the refrigeration evaporator detected by the temperature sensor, the time interval is the time interval from the last refrigeration defrosting, and the defrosting mode includes active defrosting or follow-up defrosting; Based on the defrost mode, a second temperature detection value is obtained, where the second temperature detection value is a temperature value of a temperature changing zone detected by a temperature changing sensor; A first termination rule is generated to shut down the refrigeration fan according to the first termination rule, 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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