Refrigerator

Abstract

This application discloses a refrigerator that adds an independent defrosting pipeline to a dual-system refrigerator, and uses an electric valve to switch the refrigeration circuit. To address ice blockage in the evaporator of the refrigerator compartment, two operating modes are implemented. The first mode shuts off the condenser fan and utilizes the refrigeration circuit, allowing the condenser to store heat and pre-cool the freezer compartment, preventing excessive freezing temperatures during subsequent defrosting. The second mode switches to the defrosting pipeline, relying on the high-temperature refrigerant condensation to release heat and melt the frost. Simultaneously, a two-speed compressor is used to match different operating conditions, eliminating the need for additional electric heating elements. Ice blockage is resolved using the existing refrigeration system, effectively controlling overall cost and solving the problem that conventional air-circulation defrosting cannot clear ice-blocked air ducts.

Description

Technical Field

[0001] This application relates to the field of refrigerator technology, and more particularly to a refrigerator. Background Technology

[0002] Currently, most dual-system air-cooled refrigerators use air circulation defrosting in the refrigerator compartment. This method relies on a fan to defrost the air inside the refrigerator, which is simple in structure and low in cost, making it the mainstream solution in the industry. However, in low-temperature environments, the refrigerator evaporator is prone to ice blockage. Once frost blocks the air ducts, conventional air circulation defrosting becomes completely ineffective, and the refrigerator's continued cooling will further aggravate frost buildup, creating a vicious cycle.

[0003] Existing solutions mostly involve adding electric heating wires for defrosting. However, this component is only used in a few abnormal operating conditions such as ice blockage, resulting in low equipment utilization and significantly increasing the manufacturing cost of refrigerators. Summary of the Invention

[0004] This application provides a refrigerator that can solve the problem of ice blockage in the evaporator at a low cost.

[0005] In a first aspect, a refrigerator is provided, comprising: a compressor, a condenser, a refrigerator evaporator, a freezer evaporator, an electric valve, and a controller. One end of the electric valve is connected to the output end of the condenser, and the other end of the electric valve is connected to the input end of the refrigerator evaporator via a refrigerator capillary tube, to the input end of the freezer evaporator via a freezer capillary tube, and to the input end of the refrigerator evaporator via a defrost line. The output end of the refrigerator evaporator is connected to the input end of the freezer evaporator. The output end of the freezer evaporator is connected to the input end of the compressor via a return gas line. The output end of the compressor is connected to the input end of the condenser. The controller is configured to: In the event of ice blockage in the refrigeration evaporator, the refrigerator is controlled to operate in a first working mode for a first preset duration to raise the temperature of the refrigerant in the condenser and cool the freezer compartment. The first preset duration of controlling the refrigerator to operate in the first working mode includes: controlling the compressor to operate at a first speed and turning off the condenser fan, controlling the electric valve to close the defrosting pipe and the passage where the refrigeration capillary tube is located, opening the passage where the freezing capillary tube is located, and controlling the freezer compartment fan to turn on. After controlling the refrigerator to operate in the first working mode for the first preset time, the refrigerator is controlled to operate in the second working mode so that the refrigerant flowing out of the condenser can relieve the ice blockage abnormality in the refrigeration evaporator. The control of the refrigerator to operate in the second working mode includes: controlling the compressor to operate at a second speed, controlling the electric valve to close the passage where the freezing capillary tube is located and opening the defrosting pipeline, and controlling the fan of the freezer compartment to turn off. The first speed is greater than the second speed.

[0006] The refrigerator provided in this application embodiment adds an independent defrosting pipeline to the dual-system refrigerator, and uses an electric valve to switch the refrigeration circuit. To address ice blockage in the evaporator of the refrigerator compartment, two operating modes are set up sequentially. The first operating mode shuts off the condenser fan and utilizes the refrigeration circuit, allowing the condenser to store heat and pre-cool the freezer compartment, preventing the freezing temperature from exceeding the standard during subsequent defrosting. The second operating mode switches to the defrosting pipeline, relying on the high-temperature refrigerant condensation to release heat and melt the frost. Simultaneously, two compressor speeds (high and low) are used to match different operating conditions, eliminating the need for additional electric heating elements. Ice blockage is resolved using the existing refrigeration system, effectively controlling the overall cost and solving the problem that conventional air-circulation defrosting cannot clear ice-blocked air ducts.

[0007] In some embodiments, the controller is further configured to: During the process of controlling the refrigerator to operate in the second working mode, the first real-time temperature of the refrigeration evaporator is obtained; When the first real-time temperature is less than the first preset temperature threshold, the working time of the refrigerator in the second working mode is obtained; When the working time reaches the second preset time, the refrigerator is controlled to work in the first working mode for the first preset time; after the refrigerator has worked in the first working mode for the first preset time, the refrigerator is controlled to work in the second working mode.

[0008] The refrigerator provided in this application embodiment monitors the evaporator temperature and defrosting time in real time during the second working mode. When defrosting exceeds the time limit and ice blockage is not resolved, it automatically switches back to the first working mode and restarts defrosting. This cyclic control logic can continuously maintain the high temperature of the condenser, ensuring a stable defrosting heat source, while providing phased cooling protection for the freezer compartment. This avoids prolonged single defrosting conditions that could cause the freezer temperature to rise and defrosting efficiency to decrease, thus improving the success rate of troubleshooting under extreme ice blockage conditions.

[0009] In some embodiments, the controller is further configured to: If the working time has not reached the second preset time, the refrigerator is controlled to continue working in the second working mode.

[0010] The refrigerator provided in this application embodiment continues to execute the second working mode when the defrosting time is not up to standard or the evaporator temperature does not rise. In scenarios with mild ice blockage, there is no need to frequently switch operating conditions, ensuring that the defrosting process continues, simplifying the control logic, reducing losses caused by frequent start-stop of pipelines and valves, and shortening the overall fault handling time.

[0011] In some embodiments, the controller is further configured to: If the first real-time temperature is greater than or equal to the second preset temperature threshold, it is determined that the ice blockage abnormality of the refrigerator evaporator has been resolved, and the refrigerator is controlled to operate in normal cooling mode, wherein the second preset temperature threshold is greater than the first preset temperature threshold.

[0012] The refrigerator provided in this application embodiment sets a temperature threshold as the basis for determining ice blockage relief. When the temperature of the refrigerator evaporator reaches the standard, it promptly exits the abnormal defrosting process and switches to normal cooling mode, which can avoid excessive defrosting causing energy waste and abnormal refrigerator temperature, and ensure that the refrigerator quickly restores its normal preservation and cooling functions.

[0013] In some embodiments, the controller is further configured to: When the refrigerator is operating in refrigeration mode, the duration of continuous cooling in refrigeration mode and the second real-time temperature of the refrigerator evaporator are obtained. If the continuous cooling duration exceeds a preset cooling duration threshold and the second real-time temperature is less than a second preset temperature threshold, it is determined that the refrigeration evaporator has an ice blockage abnormality.

[0014] The refrigerator provided in this application determines ice blockage abnormalities by using both the duration of continuous refrigeration and the real-time temperature of the evaporator. This allows for accurate differentiation between normal refrigeration conditions and ice blockage faults, effectively avoiding misjudgments and accidental activation of the defrosting program, reducing unnecessary switching of operating conditions, lowering overall energy consumption, and improving the refrigerator's operational stability.

[0015] In some embodiments, the controller controls the refrigerator to operate in normal cooling mode and is configured to: Obtain the third real-time temperature of the refrigerator's cold compartment; When the third real-time temperature reaches the refrigeration start-up temperature, the compressor is controlled to start, and the electric valve is controlled to open the passage where the refrigeration capillary tube is located. After the compressor has been turned on for a third preset period of time, the fan of the condenser and the fan of the refrigerator compartment are turned on.

[0016] The refrigerator provided in this application embodiment defines the startup logic for normal cooling of the refrigerator compartment, and controls the start-up and shutdown sequence of the compressor, refrigerator capillary tube, and corresponding fan according to the refrigerator compartment temperature. The condenser fan and refrigerator compartment fan are delayed in starting, allowing the refrigeration system to establish a stable operating condition before initiating air circulation, thereby improving refrigeration efficiency, avoiding temperature fluctuations caused by direct cold air blowing, and optimizing the preservation effect of the refrigerator compartment.

[0017] In some embodiments, the controller controls the refrigerator to operate in normal cooling mode and is configured to: With the compressor running, the fourth real-time temperature of the refrigerator compartment is obtained; When the fourth real-time temperature reaches the refrigeration shutdown point temperature of the compressor, the compressor, the condenser fan, and the refrigeration compartment fan are controlled to shut down, and the electric valve is controlled to close the passage where the refrigeration capillary tube is located.

[0018] The refrigerator provided in this application embodiment synchronously shuts down the compressor, fan, and closes the refrigerator capillary tube when the refrigerator compartment temperature reaches the shutdown point, achieving precise shutdown of the refrigerator compartment cooling. This allows for precise temperature control, preventing over-cooling and increased energy consumption in the refrigerator compartment. Simultaneously, closing the pipeline passages prevents ineffective refrigerant flow and extends the service life of valves and the compressor.

[0019] In some embodiments, the controller controls the refrigerator to operate in normal cooling mode and is configured to: Obtain the fifth real-time temperature of the freezer compartment of the refrigerator; When the fifth real-time temperature reaches the compressor's refrigeration start-up temperature, the compressor is controlled to start, and the electric valve is controlled to open the passage where the refrigeration capillary tube is located. After the compressor has been turned on for a fourth preset time, the fan of the condenser and the fan of the freezer compartment are turned on.

[0020] The refrigerator provided in this application embodiment defines a normal cooling start-up logic for the freezer compartment, sequentially starting the compressor, freezing capillary tube, and fan according to temperature thresholds and timing sequences. During the start-up phase, the refrigeration circuit is established first, and then the convection fan is turned on to ensure uniform cooling of the freezer compartment, stable cooling output, prevention of localized temperature anomalies, and to meet the low-temperature storage requirements of frozen food.

[0021] In some embodiments, the controller controls the refrigerator to operate in normal cooling mode and is configured to: With the compressor running, the sixth real-time temperature of the freezer compartment is obtained; When the sixth real-time temperature reaches the compressor's refrigeration shutdown point temperature, the compressor, the condenser fan, and the refrigeration chamber fan are controlled to shut down, and the electric valve is controlled to close the passage where the refrigeration capillary tube is located.

[0022] The refrigerator provided in this application embodiment shuts down the compressor and fan and cuts off the refrigeration capillary tube circuit when the freezer temperature reaches the shutdown point. This achieves orderly shutdown of the refrigeration operation, avoids continuous inefficient cooling, precisely controls the freezer temperature range, reduces operating energy consumption, and minimizes the risk of failure caused by frequent component operation.

[0023] In some embodiments, the diameter of the defrosting line is the same as the diameter of the return gas line.

[0024] The refrigerator provided in this application embodiment has a fixed diameter for the defrosting pipe and the return gas pipe. The defrosting pipe has no throttling effect, and the refrigerant does not undergo a phase change when flowing through it. This ensures that the high-temperature gaseous refrigerant is completely delivered to the refrigerator evaporator, maintaining the high-temperature heat source required for defrosting, preventing premature liquefaction of the refrigerant that would lead to a decrease in defrosting capacity, and ensuring stable defrosting performance in case of ice blockage. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application; Figure 2 A flowchart illustrating a refrigerator control method provided in an embodiment of this application; Figure 3 A flowchart illustrating a refrigerator control method provided in an embodiment of this application; Figure 4 This application provides a schematic diagram illustrating the implementation process of a controller controlling a refrigerator to operate in normal cooling mode. Figure 5 This is a schematic diagram illustrating the implementation process of a controller controlling a refrigerator to operate in normal cooling mode, as provided in an embodiment of this application. Detailed Implementation

[0026] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0027] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0028] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0029] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0030] Based on the technical problems in related technologies, this application provides a refrigerator. Figure 1This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application, as shown below. Figure 1 As shown, the device includes: a compressor, a condenser, a refrigerated evaporator, a refrigerated evaporator, an electric valve, and a controller (not shown). One end of the electric valve is connected to the output end of the condenser, and the other end of the electric valve is connected to the input end of the refrigerated evaporator via a refrigerated capillary tube, the input end of the refrigerated evaporator via a refrigerated capillary tube, and the input end of the refrigerated evaporator via a defrost line. The output end of the refrigerated evaporator is connected to the input end of the refrigerated evaporator. The output end of the refrigerated evaporator is connected to the input end of the compressor via a return gas line. The output end of the compressor is connected to the input end of the condenser.

[0031] In this embodiment, the compressor is the core power component of the refrigerator's refrigeration system. Its function is to draw in low-temperature, low-pressure gaseous refrigerant and compress it into high-temperature, high-pressure gaseous refrigerant, providing the pressure and temperature basis for refrigerant circulation and heat exchange. The condenser is a heat exchange component of the refrigeration system, located downstream of the compressor. It is used to dissipate heat from the high-temperature, high-pressure gaseous refrigerant discharged from the compressor to the outside, allowing the refrigerant to gradually liquefy. The condenser's fan is an independent heat dissipation component. When the fan is on, it enhances forced heat dissipation, and the refrigerant cools down and liquefies rapidly. When the fan is off, heat dissipation is hindered, and the condenser stores heat, maintaining the refrigerant at a high temperature, which is crucial for achieving hot gas defrosting. The refrigerator evaporator is a dedicated heat exchange component for the refrigerator compartment of a dual-system refrigerator. When the refrigerant flows through this component, it evaporates and absorbs heat, achieving cooling of the refrigerator compartment. The refrigerator evaporator is the location where ice blockage occurs. Under normal operating conditions, the refrigerator evaporator relies on air circulation for defrosting. When ice blockage occurs, frost accumulates on the evaporator surface, blocking the air duct, and air circulation defrosting fails. The freezer evaporator is a dedicated heat exchange component for the freezer compartment of the refrigerator. Refrigerant evaporation absorbs heat to achieve low-temperature cooling in the freezer compartment. In the piping, it also serves as a downstream passage for the refrigerator evaporator, receiving the refrigerant flowing out from it. The electric valve is a multi-path switching control valve integrated at the condenser output. It is the core of the entire refrigeration circuit's piping switching, selectively opening / closing three branch pipes—the refrigerator capillary branch, the freezer capillary branch, and the defrost branch—based on controller commands, thus switching the operating conditions of the refrigeration circuit. The controller is the refrigerator's main control unit, with built-in preset control programs and logical judgment rules. It collects operating signals and outputs control commands, uniformly managing compressor speed, the start / stop of various fans, and the on / off state of the electric valve. It is the main execution body of the entire control logic. The refrigerator capillary tube is a throttling component, connected in series between the electric valve and the refrigerator evaporator. When the refrigerant flows through it, it is throttled and depressurized, changing from a high-pressure liquid to a gas-liquid two-phase state, meeting the refrigeration and heat exchange requirements of the refrigerator evaporator. It is only open when the refrigerator compartment is normally cooling. The refrigeration capillary tube is a throttling component connected in series between the electric valve and the refrigeration evaporator. Its function is the same as the refrigeration capillary tube, throttling and reducing the pressure of the refrigerant to provide matching pressure and temperature conditions for the freezer compartment. The defrosting line is a dedicated functional line directly connecting the electric valve to the inlet of the refrigeration evaporator. It has no throttling structure (unlike the capillary tube), and the refrigerant does not experience pressure reduction or phase change as it flows through it. It is used to transport high-temperature gaseous refrigerant to defrost and prevent ice blockage. The return line connects the outlet of the refrigeration evaporator to the inlet of the compressor. Its function is to return the low-temperature, low-pressure gaseous refrigerant, after heat exchange, to the compressor, completing the entire refrigeration cycle.

[0032] Figure 2 A flowchart of a refrigerator control method provided in an embodiment of this application is shown below. Figure 2 As shown, the controller is configured to perform the following steps: Step S101: In the event of an ice blockage abnormality in the refrigeration evaporator, the refrigerator is controlled to operate in a first working mode for a first preset duration to raise the temperature of the refrigerant in the condenser and cool the freezer compartment. The first preset duration of controlling the refrigerator to operate in the first working mode includes: controlling the compressor to operate at a first speed and turning off the condenser fan, controlling the electric valve to close the defrosting pipe and the passage where the refrigeration capillary tube is located, opening the passage where the freezing capillary tube is located, and controlling the freezer compartment fan to turn on.

[0033] In this embodiment, the ice blockage abnormality of the refrigeration evaporator refers to a fault in which frost continuously accumulates on the surface of the evaporator in a low-temperature environment, eventually blocking the evaporator's air duct and heat exchange space. The fault is characterized by the air duct blockage causing the conventional air circulation defrosting to fail; the refrigerator continues to cool because the refrigerator compartment temperature is not up to standard, further reducing the evaporator temperature and exacerbating the frost and ice blockage. The first speed is a high speed. When the compressor operates at the first speed, the refrigerant circulation flow rate is large and the circulation speed is fast, which is used for rapid heat storage in the condenser and rapid pre-cooling of the freezer compartment. For example, the first speed can be 2500 rpm to 3000 rpm. The first preset duration is a fixed running time preset by the user, that is, the continuous running time of the first working mode. Its function is to ensure that the condenser is fully heated and the freezer compartment is pre-cooled, preparing for the subsequent defrosting process. For example, the first preset duration can be 12 to 16 minutes. The first working mode is the preparatory condition executed after the ice blockage fault is triggered. Its core purpose is to store heat and raise the temperature of the condenser and pre-cool the freezer compartment, providing a heat source for hot gas defrosting, while preventing the freezer compartment temperature from rising abnormally during the defrosting stage.

[0034] In this embodiment, when ice blockage occurs in the refrigeration evaporator, controlling the compressor to operate at the first speed can increase the refrigerant circulation rate and enhance the overall system circulation capacity. Turning off the condenser fan cancels forced cooling, significantly reducing the condenser's heat dissipation efficiency. The internal refrigerant heat cannot dissipate, achieving rapid heat storage and temperature rise, storing the high-temperature heat source required for defrosting. The electric valve closes the defrosting pipeline and the refrigeration capillary tube, and opens the freezing capillary tube, cutting off all passages on the refrigeration side. Only the freezing branch remains in the refrigeration circuit, and the refrigerant flows directionally to the freezing evaporator. Turning on the freezer compartment fan enhances the convection between the freezing evaporator and the air inside the cabinet, ensuring normal cooling of the freezer compartment and completing pre-cooling.

[0035] In this embodiment, the refrigerant flow sequence in the first working mode is: compressor → condenser (heat storage and heating) → electric valve → refrigeration capillary tube → refrigeration evaporator → return gas line → compressor.

[0036] In this embodiment, the refrigerator continues to operate in the above state until the first preset time period ends, and then automatically switches to the second working mode.

[0037] Step S102: After controlling the refrigerator to operate in the first working mode for the first preset time, control the refrigerator to operate in the second working mode so that the refrigerant flowing out of the condenser can relieve the ice blockage abnormality in the refrigeration evaporator. The step of controlling the refrigerator to operate in the second working mode includes: controlling the compressor to operate at a second speed, controlling the electric valve to close the passage where the freezing capillary tube is located and opening the defrosting pipeline, and controlling the fan of the freezer compartment to turn off. The first speed is greater than the second speed.

[0038] In this embodiment, the second speed is a low speed. When the compressor operates at the second speed, the refrigerant circulation is smooth, ensuring that the high-temperature gaseous refrigerant fully releases heat and defrosts in the refrigerated evaporator, avoiding excessive flow that could affect the defrosting effect. For example, the second speed can be 900 rpm to 1200 rpm. The second working mode is the core defrosting condition that starts after the first working mode has finished running. It utilizes the high-temperature refrigerant stored in the condenser to melt the frost on the refrigerated evaporator and relieve ice blockage.

[0039] In this embodiment, controlling the compressor to operate at a second speed can slow down the refrigerant circulation speed, allowing the high-temperature refrigerant to stay in the refrigeration evaporator for a longer time, fully releasing heat and defrosting. Controlling the electric valve to close the refrigeration capillary tube and open the defrosting pipeline can cut off the refrigeration branch and connect the dedicated defrosting pipeline, directing the high-temperature refrigerant into the refrigeration evaporator. Controlling the fan in the freezer compartment to turn off ensures that no refrigerant flows into the refrigeration branch, eliminating the need for the fan to operate and reducing the overall energy consumption of the unit.

[0040] In this embodiment, the refrigerant flow in the second working mode is as follows: compressor → high-temperature condenser → electric valve → defrosting pipeline (no throttling, maintaining gaseous high temperature) → refrigeration evaporator → freezing evaporator → return gas pipeline → compressor.

[0041] In this embodiment, the high-temperature, high-pressure gaseous refrigerant flows out of the compressor and enters the condenser, which maintains a high temperature. It then flows into the defrosting pipeline via an electric valve. Since the defrosting pipeline has no throttling structure, the refrigerant remains in a high-temperature gaseous state and is delivered to the refrigerated evaporator. The high-temperature gaseous refrigerant undergoes a condensation reaction inside the refrigerated evaporator and releases a large amount of heat. The released heat is used to melt the frost accumulated on the surface of the evaporator and relieve the ice blockage. After releasing heat, the refrigerant turns into a liquid and flows from the output end of the refrigerated evaporator into the refrigerated evaporator for temporary storage and secondary evaporation. Finally, it flows back to the compressor via the return gas pipeline to complete the cycle.

[0042] The refrigerator provided in this application embodiment adds an independent defrosting pipeline to the dual-system refrigerator, and uses an electric valve to switch the refrigeration circuit. To address ice blockage in the evaporator of the refrigerator compartment, two operating modes are set up sequentially. The first operating mode shuts off the condenser fan and utilizes the refrigeration circuit, allowing the condenser to store heat and pre-cool the freezer compartment, preventing the freezing temperature from exceeding the standard during subsequent defrosting. The second operating mode switches to the defrosting pipeline, relying on the high-temperature refrigerant condensation to release heat and melt the frost. Simultaneously, two compressor speeds (high and low) are used to match different operating conditions, eliminating the need for additional electric heating elements. Ice blockage is resolved using the existing refrigeration system, effectively controlling the overall cost and solving the problem that conventional air-circulation defrosting cannot clear ice-blocked air ducts.

[0043] In some embodiments, the controller is configured to perform the following steps: Step S103: During the process of controlling the refrigerator to operate in the second working mode, the first real-time temperature of the refrigeration evaporator is obtained.

[0044] In this embodiment of the application, the first real-time temperature refers to the surface temperature of the refrigerated evaporator that is collected in real time by the temperature detection element during the operation of the second working mode, and it is the core monitoring parameter for judging the state of frost melting.

[0045] In this embodiment, the controller continuously calls the temperature detection module to obtain the first real-time temperature of the refrigerated evaporator and monitor the temperature change of the evaporator throughout the process to determine the progress of frost melting.

[0046] Step S104: When the first real-time temperature is less than the first preset temperature threshold, obtain the working time of the refrigerator in the second working mode.

[0047] In this embodiment, the first preset temperature threshold is a temperature judgment value pre-written into the controller, used to characterize that the refrigerator evaporator is still in a low-temperature state where ice blockage has not been resolved. When the first real-time temperature is lower than this threshold, it indicates that the frost on the evaporator surface has not melted sufficiently, and the ice blockage problem still exists. For example, the first preset temperature threshold can be 1 to 3°C. The working time refers to the cumulative time of a single continuous operation of the refrigerator in the second working mode, which is counted in real time by the internal timer of the controller.

[0048] In this embodiment, the controller compares the collected first real-time temperature with a first preset temperature threshold. If the first real-time temperature is lower than the first preset temperature threshold, it indicates that the frost on the surface of the refrigerator evaporator has not melted effectively, and the ice blockage fault has not been eliminated. The controller then initiates a duration statistics logic. If the first real-time temperature is not lower than the first preset temperature threshold, the controller exits this loop logic and executes the subsequent fault resolution determination process. The controller starts a timer to count the duration of continuous operation of the refrigerator in the second working mode.

[0049] Step S105: When the working time reaches the second preset time, control the refrigerator to work in the first working mode for the first preset time; after the refrigerator has worked in the first working mode for the first preset time, control the refrigerator to work in the second working mode.

[0050] In this embodiment, the second preset duration is a pre-set maximum single defrost duration, which serves as the operating time limit for the second working mode. If a single defrost cycle reaches this duration but the evaporator temperature still fails to meet the standard, the single defrost effect is deemed insufficient, triggering the operating cycle logic. For example, the second preset duration can be 15 minutes.

[0051] In this embodiment, the controller compares the accumulated working time with a second preset time. When the accumulated working time reaches the second preset time, it indicates that the defrosting time for a single second working mode has been used up, but the ice blockage has not yet been resolved. The controller immediately issues a command to switch the refrigerator to the first working mode and run it for the full first preset time. After the first working mode has run for its full duration, the controller automatically switches back to the second working mode to restart the defrosting operation, completing one working cycle.

[0052] In this embodiment, the controller switches the compressor to a first speed (high speed), turns on the condenser fan, controls the electric valve to close the defrost line and the refrigeration capillary tube, and opens the freezing capillary tube, while simultaneously turning on the freezer fan. The refrigerator enters the pre-cooling phase of condenser heat storage and freezer pre-cooling, running for a complete first preset time. After the first preset time ends, the controller switches the compressor to a second speed (low speed), turns off the condenser fan and the freezer fan, controls the electric valve to close the freezing capillary tube and reopen the defrost line, and the refrigerator re-enters the defrosting phase.

[0053] The refrigerator provided in this application embodiment monitors the evaporator temperature and defrosting time in real time during the second working mode. When defrosting exceeds the time limit and ice blockage is not resolved, it automatically switches back to the first working mode and restarts defrosting. This cyclic control logic can continuously maintain the high temperature of the condenser, ensuring a stable defrosting heat source, while providing phased cooling protection for the freezer compartment. This avoids prolonged single defrosting conditions that could cause the freezer temperature to rise and defrosting efficiency to decrease, thus improving the success rate of troubleshooting under extreme ice blockage conditions.

[0054] In some embodiments, the controller is also configured to perform the following steps: Step S106: If the working time has not reached the second preset time, control the refrigerator to continue working in the second working mode.

[0055] In this embodiment of the application, when it is detected that the current working time has not reached the second preset time, the controller does not trigger the working condition switching command, maintains the existing component working state unchanged, controls the refrigerator to continue to operate in the second working mode, and continuously uses high-temperature refrigerant to defrost and defrost the evaporator.

[0056] The refrigerator provided in this application embodiment continues to execute the second working mode when the defrosting time is not up to standard or the evaporator temperature does not rise. In scenarios with mild ice blockage, there is no need to frequently switch operating conditions, ensuring that the defrosting process continues, simplifying the control logic, reducing losses caused by frequent start-stop of pipelines and valves, and shortening the overall fault handling time.

[0057] In some embodiments, the controller is further configured to perform the following steps: Step S107: When the first real-time temperature is greater than or equal to the second preset temperature threshold, it is determined that the ice blockage abnormality of the refrigerator evaporator has been resolved, and the refrigerator is controlled to work in normal cooling mode, wherein the second preset temperature threshold is greater than the first preset temperature threshold.

[0058] In this embodiment, the normal cooling mode is the conventional operating mode preset by the refrigerator at the factory, which is divided into two conventional operating conditions: refrigerator compartment cooling and freezer compartment cooling. It is also the standard operating mode for daily food storage in the refrigerator.

[0059] In this embodiment, when the first real-time temperature is detected to be greater than or equal to the second preset temperature threshold, the controller directly determines that the frost accumulated on the surface of the refrigerator evaporator has completely melted, the air duct is now unobstructed, and the ice blockage is resolved. The controller then immediately issues a mode switching command, terminating the current second operating mode and controlling the refrigerator to switch to normal cooling mode. The entire judgment process is independent of the time-based judgment logic: as long as the evaporator temperature reaches the fault resolution standard, regardless of whether the cumulative running time of the second operating mode has reached the second preset time, mode switching is prioritized to end the abnormal defrosting process.

[0060] The refrigerator provided in this application embodiment sets a temperature threshold as the basis for determining ice blockage relief. When the temperature of the refrigerator evaporator reaches the standard, it promptly exits the abnormal defrosting process and switches to normal cooling mode, which can avoid excessive defrosting causing energy waste and abnormal refrigerator temperature, and ensure that the refrigerator quickly restores its normal preservation and cooling functions.

[0061] In some embodiments, before the controller executes step S101, it is further configured to execute the following steps: Step S1011: When the refrigerator is operating in refrigeration mode, obtain the continuous cooling duration of the refrigerator operating in refrigeration mode and the second real-time temperature of the refrigeration evaporator.

[0062] In this embodiment, the refrigeration mode is the normal operating condition of the refrigerator, aiming to maintain the set temperature of the refrigerator compartment, and the refrigeration evaporator and refrigeration circuit are in normal working mode. The continuous cooling duration is the cumulative time the refrigerator is continuously in refrigeration mode, which is counted in real time by the controller's built-in timer. The preset cooling duration threshold is a critical duration value pre-written into the controller, representing the reasonable maximum continuous cooling time under normal operating conditions. Under normal and fault-free conditions, the refrigerator will not continuously cool for extended periods. The second real-time temperature is the surface temperature of the refrigeration evaporator collected in real time by the temperature detection element when the refrigerator is operating in refrigeration mode.

[0063] In this embodiment of the application, after the refrigerator starts and runs the refrigeration mode, the controller simultaneously starts two monitoring tasks: first, it continuously counts the duration of continuous cooling in the refrigeration mode through a timer; second, it collects the second real-time temperature of the refrigeration evaporator through a temperature sensor.

[0064] Step S1012: If the continuous cooling duration is greater than a preset cooling duration threshold and the second real-time temperature is less than a third preset temperature threshold, it is determined that the refrigeration evaporator has an ice blockage abnormality.

[0065] In this embodiment, the preset cooling duration threshold is a critical duration value pre-written into the controller, representing the longest reasonable continuous cooling time under normal operating conditions. Under normal, fault-free conditions, the refrigerator will not continuously cool for extended periods. The preset cooling duration threshold can be 80 to 90 minutes. The third preset temperature threshold is a preset temperature value used to determine if ice blockage is present; the third preset temperature threshold can be -20°C.

[0066] In this embodiment, the controller compares the collected continuous cooling duration with a preset cooling duration threshold, and at the same time compares the second real-time temperature with a second preset temperature threshold. The controller performs logic and judgment: when both conditions are met, such as continuous cooling duration > preset cooling duration threshold and second real-time temperature < third preset temperature threshold, the controller determines that the refrigeration evaporator air duct is blocked by frost and the refrigeration evaporator has an ice blockage abnormality.

[0067] In this embodiment of the application, after the ice blockage abnormality determination takes effect, the controller immediately terminates the normal refrigeration mode and sequentially starts the first working mode, the second working mode and the supporting cycle defrosting and fault removal judgment process to carry out the ice blockage removal operation.

[0068] The refrigerator provided in this application determines ice blockage abnormalities by using both the duration of continuous refrigeration and the real-time temperature of the evaporator. This allows for accurate differentiation between normal refrigeration conditions and ice blockage faults, effectively avoiding misjudgments and accidental activation of the defrosting program, reducing unnecessary switching of operating conditions, lowering overall energy consumption, and improving the refrigerator's operational stability.

[0069] Based on the foregoing embodiments, this application provides a specific example of a refrigerator control method. Figure 3 A flowchart of a refrigerator control method provided in an embodiment of this application is shown in the figure. The controller is configured to perform the following steps: Step S301: Refrigeration mode continues cooling, and the duration of continuous cooling is recorded.

[0070] In this embodiment of the application, the refrigerator continuously cools, and the ambient temperature is detected by an ambient temperature sensor, which also records the duration of continuous refrigeration.

[0071] Step S302: Determine whether the continuous cooling time has reached more than 90 minutes.

[0072] In this embodiment, if the continuous cooling time exceeds the preset continuous cooling time (90 minutes), step S303 is executed; if 90 minutes have not been reached, step S301 is executed.

[0073] Step S303: Determine whether the temperature of the refrigerated evaporator is less than -20℃.

[0074] In this embodiment of the application, if the temperature is less than -20°C, step S304 is executed; if the temperature is not less than -20°C, step S301 is executed.

[0075] In step S304, ice blockage occurs in the refrigeration evaporator.

[0076] In this embodiment of the application, after step S304, abnormal defrosting is initiated to resolve the abnormal state of the refrigerator.

[0077] Step S305: Start the compressor at 3000 rpm.

[0078] At this time, the compressor is running at a high speed of 3000 rpm.

[0079] Step S306: Open the freezing capillary tube and turn on the freezing chamber fan.

[0080] In this embodiment, the freezing capillary tube is first opened, but the fan of the condenser at the bottom of the refrigerator is not allowed to operate. Because the fan is not running, the condenser temperature continues to rise, reaching above 80°C. This pre-cooling process, occurring before the refrigerator starts its abnormal defrosting process, prevents the freezing temperature from rising during the refrigerator's cooling cycle. Because the freezing capillary tube is closed, the liquid refrigerant in the refrigerator evaporator evaporates into gas under low pressure, preparing for the next step of high-temperature gas entering the refrigerator evaporator.

[0081] Step S307: After running for 15 minutes, turn off the refrigeration capillary tube and the light ratio refrigeration chamber fan, open the defrosting pipeline, and adjust the compressor speed to 900 rpm.

[0082] In this embodiment, the compressor is switched to its lowest operating speed, typically 900-1200 rpm. At this speed, the capillary tube at the inlet of the refrigeration evaporator is closed, and the inlet of the defrosting line connected to the refrigeration evaporator is opened (the defrosting line has the same diameter as the return gas line and does not throttle the refrigerant, so the refrigerant does not undergo a phase change). Because the condenser is preheated, the refrigerant does not condense and liquefy after entering the condenser during the defrosting process. The refrigerant remains in a high-temperature gaseous state in the condenser. When the refrigerant enters the refrigeration evaporator, it condenses and releases heat, defrosting the frost that has formed on the condenser. Then it enters the refrigeration evaporator, where it gradually accumulates, forming liquid refrigerant. As the refrigeration evaporator stores more and more refrigerant, the pressure in the return gas line is low, and the refrigerant at the evaporator outlet gradually evaporates, returning to the compressor suction line for the next cycle. Then it enters the condenser, absorbs heat from the environment, and continues to enter the refrigeration evaporator for defrosting.

[0083] Step S308: Continuously monitor the temperature of the refrigeration evaporator.

[0084] Step S309: Determine if the temperature is greater than 1℃.

[0085] In this embodiment of the application, if the temperature is greater than 1°C, step S310 is executed; if the temperature is not greater than 1°C, step S311 is executed.

[0086] Step S310: Abnormality resolved, shutdown and return to normal working mode.

[0087] In this embodiment of the application, when the temperature sensor on the refrigerator evaporator detects that the temperature of the refrigerator evaporator is higher than 1°C, it is determined that the evaporator ice blockage fault has been resolved and the frost has been melted, and the refrigerator switches to normal cooling control.

[0088] Step S311: Does the duration exceed 15 minutes?

[0089] In this embodiment of the application, during the defrosting operation of the refrigeration evaporator, the duration of abnormal defrosting of the refrigeration unit should be continuously monitored. If the duration exceeds 15 minutes and the temperature of the refrigeration evaporator still does not reach 1°C, then step S305 is executed.

[0090] If 15 minutes have not been reached, proceed to step S308.

[0091] The control method provided in this application embodiment can ensure that the freezer temperature is normal during the abnormal defrosting process of refrigeration, and can effectively defrost by maintaining the condenser temperature at a high temperature.

[0092] In some embodiments, Figure 4This application provides a schematic diagram illustrating the implementation process of a controller controlling a refrigerator to operate in normal cooling mode, as shown in the embodiment of the present application. Figure 4 As shown, it includes: Step S401: Obtain the third real-time temperature of the refrigerator compartment.

[0093] In this embodiment, the third real-time temperature is the ambient temperature inside the refrigerator compartment detected in real time by the temperature sensor during the normal cooling mode of the refrigerator, which serves as the basis for determining whether cooling starts or stops.

[0094] In this embodiment, the controller continuously collects the third real-time temperature of the refrigerator compartment through a temperature sensor to monitor temperature changes in the refrigerator compartment.

[0095] In step S402, when the third real-time temperature reaches the refrigeration start-up temperature, the compressor is controlled to start, and the electric valve is controlled to open the passage where the refrigeration capillary tube is located.

[0096] In this embodiment, the refrigeration start-up temperature is a preset temperature threshold in the controller. When the refrigeration temperature rises to this value, it means that the refrigeration temperature is too high and the refrigeration needs to be started to cool down.

[0097] In this embodiment of the application, when the third real-time temperature is detected to reach the refrigeration start-up temperature, it is determined that the refrigeration compartment needs to be refrigerated and cooled. The controller outputs a start command: on the one hand, it controls the compressor to start running and provide power for the refrigerant circulation; on the other hand, it controls the electric valve to open the passage where the refrigeration capillary tube is located, conducts the dedicated refrigeration branch of the refrigeration compartment, and establishes the refrigeration circuit.

[0098] Step S403: After controlling the compressor to start for a third preset time, control the condenser fan to start and the refrigerator compartment fan to start.

[0099] In this embodiment, the third preset duration is the delay duration after the compressor starts, which is a preset fixed value, used to ensure that the refrigeration circuit first establishes a stable pressure and refrigerant circulation.

[0100] In this embodiment, after the compressor is turned on, the controller starts timing. When the running time reaches the third preset duration, the condenser fan and the refrigerator compartment fan are turned on sequentially. After the condenser fan starts, it enhances the heat dissipation of the condenser and ensures the normal liquefaction of the refrigerant; after the refrigerator compartment fan starts, it accelerates the air convection inside the compartment and improves the overall cooling efficiency.

[0101] Step S404: With the compressor turned on, obtain the fourth real-time temperature of the refrigerator compartment.

[0102] In this embodiment, the fourth real-time temperature is the ambient temperature inside the refrigerator compartment that is collected in real time by the temperature sensor during the compressor's operation and refrigeration.

[0103] In this embodiment of the application, the controller continuously collects the fourth real-time temperature of the refrigerator compartment and compares it with the temperature at the refrigerator shutdown point.

[0104] Step S405: When the fourth real-time temperature reaches the refrigeration shutdown point temperature of the compressor, control the compressor, the condenser fan and the refrigeration compartment fan to shut down, and control the electric valve to close the passage where the refrigeration capillary tube is located.

[0105] In this embodiment, the refrigeration shutdown point temperature is a preset low temperature threshold, which is lower than the aforementioned refrigeration startup point temperature; when the refrigeration room temperature drops to this value, it is determined that the refrigeration room has reached the set insulation temperature and there is no need to continue refrigeration.

[0106] In this embodiment of the application, when the fourth real-time temperature reaches the refrigeration shutdown point temperature, it is determined that the refrigeration chamber cooling has met the standard, and the controller performs the shutdown action: first, the compressor, condenser fan and refrigeration chamber fan are shut down in sequence to terminate the refrigerant circulation and air convection heat exchange; second, the electric valve is controlled to close the refrigeration capillary tube, cut off the refrigeration branch of the refrigeration circuit, and prevent the refrigerant from flowing ineffectively in the pipeline.

[0107] The refrigerator provided in this application embodiment defines the startup logic for normal cooling in the refrigerator compartment, controlling the sequential start-up and shutdown of the compressor, refrigeration capillary tube, and corresponding fan based on the refrigerator compartment temperature. The condenser fan and refrigerator compartment fan are delayed in activation, allowing the refrigeration system to establish a stable operating condition before initiating air circulation, improving cooling efficiency, avoiding temperature fluctuations caused by direct cold air blowing, and optimizing the refrigerator compartment's preservation effect. Upon reaching the shutdown point at the refrigerator compartment temperature, the compressor, fan, and refrigeration capillary tube are simultaneously shut down, achieving precise shutdown of the refrigerator compartment's cooling. This allows for precise temperature control, preventing over-cooling and increased energy consumption in the refrigerator compartment, while simultaneously closing pipeline passages to prevent ineffective refrigerant flow and extend the service life of valves and the compressor.

[0108] In some embodiments, Figure 5 This application provides a schematic diagram illustrating the implementation process of a controller controlling a refrigerator to operate in normal cooling mode, as shown in the embodiment of the present application. Figure 5 As shown, the controller is also configured to perform the following steps: Step S501: Obtain the fifth real-time temperature of the freezer compartment of the refrigerator.

[0109] In this embodiment, the fifth real-time temperature is the ambient temperature inside the freezer compartment detected in real time by the temperature sensor when the refrigerator is in normal cooling mode, which serves as the basis for determining whether cooling is started.

[0110] In this embodiment, the controller continuously collects the fifth real-time temperature of the freezer compartment through a temperature sensor to monitor the temperature change of the freezer compartment in real time.

[0111] Step S502: When the fifth real-time temperature reaches the compressor's refrigeration start-up temperature, control the compressor to start and control the electric valve to open the passage where the refrigeration capillary tube is located.

[0112] In this embodiment of the application, the start-up temperature of the freezer is a temperature threshold pre-stored in the controller. When the freezer temperature rises to this temperature, it indicates that the freezer temperature is too high and the refrigeration operation needs to be started.

[0113] In this embodiment of the application, when the fifth real-time temperature is detected to reach the refrigeration start-up point temperature, the controller determines that the freezer compartment needs to be cooled down and then outputs a control command: start the compressor to provide power for the refrigerant circulation; at the same time, control the electric valve to open the refrigeration capillary tube and conduct the dedicated refrigeration branch of the freezer compartment.

[0114] Step S503: After controlling the compressor to start for a fourth preset time, control the condenser fan to start and the freezer fan to start.

[0115] In this embodiment, the fourth preset duration is a fixed delay duration after the compressor starts, which is a preset parameter of the system used to ensure that the pressure of the refrigeration circuit and the refrigerant circulation tend to stabilize in advance.

[0116] In this embodiment, after the compressor starts, the controller begins timing; when the running time reaches the fourth preset duration, the controller sequentially turns on the condenser fan and the freezer fan. The condenser fan operates to enhance condenser heat dissipation and ensure normal refrigerant liquefaction; the freezer fan operates to accelerate air convection within the freezer compartment and improve heat exchange and cooling efficiency.

[0117] Step S504: With the compressor turned on, obtain the sixth real-time temperature of the freezer compartment.

[0118] In this embodiment, the sixth real-time temperature is the ambient temperature inside the freezer compartment that is collected in real time by the temperature sensor during the operation of the compressor and the refrigeration circuit, which serves as the basis for determining whether the refrigeration will stop.

[0119] In this embodiment of the application, the controller continuously collects the sixth real-time temperature of the freezer compartment and compares it with the freezer shutdown temperature in real time.

[0120] In step S505, when the sixth real-time temperature reaches the compressor's refrigeration shutdown point temperature, the compressor, the condenser fan, and the refrigeration chamber fan are controlled to shut down, and the electric valve is controlled to close the passage where the refrigeration capillary tube is located.

[0121] In this embodiment, the freezer shutdown temperature is a preset low-temperature threshold in the controller, which is lower than the freezer startup temperature. When the freezer temperature drops to this value, it is determined that the freezer has reached the set storage temperature and there is no need to continue cooling.

[0122] In this embodiment of the application, when the sixth real-time temperature is detected to reach the refrigeration shutdown point temperature, the controller determines that the refrigeration chamber temperature has reached the standard and immediately performs a shutdown operation: sequentially shutting down the compressor, condenser fan and refrigeration chamber fan to terminate the refrigerant circulation and air convection heat exchange; at the same time, controlling the electric valve to close the refrigeration capillary tube to cut off the refrigeration branch.

[0123] The refrigerator provided in this application embodiment defines a normal cooling start-up logic for the freezer compartment, sequentially starting the compressor, freezing capillary tube, and fan according to temperature thresholds and timing sequences. During the start-up phase, the cooling circuit is established first, followed by the activation of the convection fan, ensuring uniform cooling of the freezer compartment, stable cooling output, preventing localized temperature anomalies, and meeting the low-temperature storage requirements for frozen foods. When the freezer compartment temperature reaches the shutdown point, the compressor and fan are simultaneously shut down, and the freezing capillary tube circuit is disconnected. This achieves orderly shutdown of the freezer cooling operation, avoiding continuous inefficient cooling, precisely controlling the freezer compartment temperature range, reducing operating energy consumption, and minimizing the risk of malfunctions caused by frequent component operation.

[0124] In some embodiments, the diameter of the defrosting line is the same as the diameter of the return gas line.

[0125] The refrigerator provided in this application embodiment has a fixed diameter for the defrosting pipe and the return gas pipe. The defrosting pipe has no throttling effect, and the refrigerant does not undergo a phase change when flowing through it. This ensures that the high-temperature gaseous refrigerant is completely delivered to the refrigerator evaporator, maintaining the high-temperature heat source required for defrosting, preventing premature liquefaction of the refrigerant that would lead to a decrease in defrosting capacity, and ensuring stable defrosting performance in case of ice blockage.

[0126] In some embodiments, the controller is further configured to: count the total number of cycles the refrigerator cycles between the second working mode and the first working mode; when the total number of cycles reaches a preset cycle number threshold and the first real-time temperature of the refrigerator evaporator is still less than the first preset temperature threshold, determine that the ice blockage fault cannot be resolved by itself, control the refrigerator to exit the defrosting cycle and enter the fault protection state, and at the same time drive the refrigerator's alarm component to issue a fault warning signal.

[0127] In some embodiments, the refrigerator further includes an ambient temperature sensor, and the controller is further configured to: acquire the real-time ambient temperature of the environment in which the refrigerator is located through the ambient temperature sensor; and adjust a first preset duration, a second preset duration, and a first speed and a second speed of the compressor according to the real-time ambient temperature; wherein, the lower the ambient temperature, the larger the values ​​of the first preset duration and the second preset duration.

[0128] In some embodiments, the controller is further configured to: when the ambient real-time temperature is detected to be lower than a preset low temperature threshold and the refrigerator is running in refrigeration mode, reduce the operating duty cycle of the refrigeration fan in advance, and intermittently activate the defrosting pipeline to run the second working mode for a short time to prevent defrost the refrigeration evaporator and suppress ice blockage.

[0129] In some embodiments, the controller is further configured to: count the cumulative number of times the refrigerator evaporator experiences ice blockage within a preset statistical period; when the cumulative number exceeds a frequency threshold, determine that the refrigerator frost buildup has worsened, drive the alarm component to issue a maintenance reminder signal, and remind the user to clean or repair it.

[0130] In some embodiments, the controller is further configured to: during operation in the second working mode, dynamically and steplessly adjust the compressor speed according to the first real-time temperature change rate of the refrigeration evaporator; the slower the temperature rise rate, the higher the compressor speed is appropriately increased to enhance the refrigerant circulation and strengthen the defrosting capability.

[0131] In some embodiments, the refrigerator further includes an ambient temperature sensor, and the controller incorporates a multi-parameter fusion adaptive control algorithm. The controller is configured to: collect five types of operating parameters in real time: ambient temperature, first real-time temperature of the refrigeration evaporator, first real-time temperature change rate, cumulative defrost cycles of the refrigerator, and real-time load of the freezer compartment; based on a preset algorithm model, dynamically correct the first preset duration, second preset duration, first preset temperature threshold, and second preset temperature threshold in combination with the five types of operating parameters, and perform multi-level continuous speed adjustment of the compressor according to the defrosting status of the refrigeration evaporator.

[0132] In some embodiments, the controller is further configured to: establish an ambient temperature-duration correction model and a temperature change rate-temperature threshold correction model; when the ambient temperature decreases, simultaneously increase the first preset duration and the second preset duration, and decrease the first preset temperature threshold and the second preset temperature threshold; when the first real-time temperature rise rate of the refrigeration evaporator is less than the preset rate lower limit, determine that the defrosting rate is too slow, further extend the second preset duration, and slightly increase the second preset temperature threshold.

[0133] In some embodiments, the logic of the controller distinguishing between three levels of ice blockage and executing corresponding actions includes: if the cumulative number of defrost cycles is less than the first cycle threshold and the temperature of the refrigerator evaporator continues to rise, it is determined to be a minor ice blockage, and the refrigerator is controlled to continue to execute the first working mode and the second working mode according to the normal cycle logic; if the cumulative number of defrost cycles is between the first cycle threshold and the second cycle threshold, and the rate of temperature rise of the refrigerator evaporator is continuously lower than a preset value, it is determined to be a severe ice blockage, and an enhanced defrost strategy is triggered, simultaneously extending the first preset duration and the second preset duration, and increasing the compressor base speed; if the cumulative number of defrost cycles is greater than the second cycle threshold, and the first real-time temperature of the refrigerator evaporator is always lower than the first preset temperature threshold, it is determined to be a permanent ice blockage fault, and the refrigerator is controlled to immediately exit the cycle defrost process, shut down all refrigeration circuits, and drive the alarm component to issue a graded fault prompt signal.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0135] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A refrigerator, characterized in that, include: The system includes a compressor, a condenser, a refrigerated evaporator, a refrigerated evaporator, an electric valve, and a controller. One end of the electric valve is connected to the output of the condenser, and the other end is connected to the input of the refrigerated evaporator via a refrigerated capillary tube, the input of the refrigerated evaporator via a refrigerated capillary tube, and the input of the refrigerated evaporator via a defrost line. The output of the refrigerated evaporator is connected to the input of the refrigerated evaporator. The output of the refrigerated evaporator is connected to the input of the compressor via a return line. The output of the compressor is connected to the input of the condenser. The controller is configured as follows: In the event of an ice blockage abnormality in the refrigeration evaporator, the refrigerator is controlled to operate in a first working mode for a first preset duration to raise the temperature of the refrigerant in the condenser and cool the freezer compartment. The first preset duration of controlling the refrigerator to operate in the first working mode includes: controlling the compressor to operate at a first speed and turning off the condenser fan, controlling the electric valve to close the defrosting pipe and the passage where the refrigeration capillary tube is located, opening the passage where the freezing capillary tube is located, and controlling the freezer compartment fan to turn on. After controlling the refrigerator to operate in the first working mode for the first preset time, the refrigerator is controlled to operate in the second working mode so that the refrigerant flowing out of the condenser can relieve the ice blockage abnormality in the refrigeration evaporator. The control of the refrigerator to operate in the second working mode includes: controlling the compressor to operate at a second speed, controlling the electric valve to close the passage where the freezing capillary tube is located and opening the defrosting pipeline, and controlling the fan of the freezer compartment to turn off. The first speed is greater than the second speed.

2. The refrigerator according to claim 1, characterized in that, The controller is also configured to: During the process of controlling the refrigerator to operate in the second working mode, the first real-time temperature of the refrigeration evaporator is obtained; When the first real-time temperature is less than the first preset temperature threshold, the working time of the refrigerator in the second working mode is obtained; When the working time reaches the second preset time, the refrigerator is controlled to work in the first working mode for the first preset time. After the refrigerator has been operating in the first working mode for the first preset time, the refrigerator is controlled to operate in the second working mode.

3. The refrigerator according to claim 2, characterized in that, The controller is also configured to: If the working time has not reached the second preset time, the refrigerator is controlled to continue working in the second working mode.

4. The refrigerator according to claim 2, characterized in that, The controller is also configured to: If the first real-time temperature is greater than or equal to the second preset temperature threshold, it is determined that the ice blockage abnormality of the refrigerator evaporator has been resolved, and the refrigerator is controlled to operate in normal cooling mode, wherein the second preset temperature threshold is greater than the first preset temperature threshold.

5. The refrigerator according to any one of claims 1 to 4, characterized in that, The controller is also configured to: When the refrigerator is operating in refrigeration mode, the duration of continuous cooling in refrigeration mode and the second real-time temperature of the refrigerator evaporator are obtained. If the continuous cooling duration exceeds a preset cooling duration threshold and the second real-time temperature is less than a third preset temperature threshold, it is determined that the refrigeration evaporator has an ice blockage abnormality.

6. The refrigerator according to claim 4, characterized in that, The controller controls the refrigerator to operate in normal cooling mode and is configured as follows: Obtain the third real-time temperature of the refrigerator's cold compartment; When the third real-time temperature reaches the refrigeration start-up temperature, the compressor is controlled to start, and the electric valve is controlled to open the passage where the refrigeration capillary tube is located. After the compressor has been turned on for a third preset period of time, the fan of the condenser and the fan of the refrigerator compartment are turned on.

7. The refrigerator according to claim 6, characterized in that, The controller controls the refrigerator to operate in normal cooling mode and is configured as follows: With the compressor running, the fourth real-time temperature of the refrigerator compartment is obtained; When the fourth real-time temperature reaches the refrigeration shutdown point temperature of the compressor, the compressor, the condenser fan, and the refrigeration compartment fan are controlled to shut down, and the electric valve is controlled to close the passage where the refrigeration capillary tube is located.

8. The refrigerator according to claim 4, characterized in that, The controller controls the refrigerator to operate in normal cooling mode and is configured as follows: Obtain the fifth real-time temperature of the freezer compartment of the refrigerator; When the fifth real-time temperature reaches the compressor's refrigeration start-up temperature, the compressor is controlled to start, and the electric valve is controlled to open the passage where the refrigeration capillary tube is located. After the compressor has been turned on for a fourth preset time, the fan of the condenser and the fan of the freezer compartment are turned on.

9. The refrigerator according to claim 8, characterized in that, The controller controls the refrigerator to operate in normal cooling mode and is configured as follows: With the compressor running, the sixth real-time temperature of the freezer compartment is obtained; When the sixth real-time temperature reaches the compressor's refrigeration shutdown point temperature, the compressor, the condenser fan, and the refrigeration chamber fan are controlled to shut down, and the electric valve is controlled to close the passage where the refrigeration capillary tube is located.

10. The refrigerator according to claim 1, characterized in that, The diameter of the defrosting pipe is the same as the diameter of the return gas pipe.

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