A defrosting device, a defrosting control method, and a storage medium

Abstract

The application provides a defrosting device, a defrosting control method and a storage medium, which comprises a low-temperature space in a refrigeration chamber, a semiconductor module with a cold end and a hot end, a special air duct, a heat dissipation fan, a first temperature sensor, a second temperature sensor and a controller. In response to the start of the defrosting function, the controller controls the evaporator to stop cooling, controls the semiconductor module to be powered on and controls the heat dissipation fan to start, acquires a first evaporator temperature value detected by the first temperature sensor, controls the semiconductor module to be powered off when the first evaporator temperature value reaches a first preset temperature value, controls the evaporator to resume cooling, acquires a second evaporator temperature value detected by the first temperature sensor and a low-temperature space temperature value detected by the second temperature sensor, and controls the heat dissipation fan to stop when the second evaporator temperature value is lower than a second preset temperature value and the low-temperature space temperature value is lower than a third preset temperature value. The application solves the problems of low defrosting efficiency and high temperature rise in the refrigeration chamber in the prior art.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a defrosting device, a defrosting control method, and a storage medium. Background Technology

[0002] Dual-system refrigerators, with their advantages of independent cooling for the refrigerator and freezer compartments, reduced odor mixing, and superior preservation, have gradually become the mainstream choice for household food storage. During operation, frost gradually condenses on the evaporator surface of the refrigerator compartment. This frost buildup leads to decreased heat exchange efficiency, reduced cooling performance, and increased energy consumption, necessitating regular defrosting of the evaporator. The effectiveness of defrosting directly impacts the refrigerator's cooling performance and the preservation quality of food.

[0003] In the existing technology, there are two main defrosting methods for the evaporator in the refrigerator compartment of a dual-system refrigerator: one is natural defrosting, which relies on the ambient temperature to melt the frost on the surface of the evaporator naturally during the compressor shutdown period; the other is to set up an aluminum foil heater near the evaporator and heat the evaporator by applying electricity to defrost it.

[0004] However, the existing technologies still have the following problems: Natural defrosting lacks active heating, resulting in extremely low defrosting efficiency. Especially when users place large amounts of high-moisture food inside and the external ambient temperature is low, severe frost buildup occurs on the evaporator in the refrigerator compartment, leading to excessively long defrosting times and the evaporator failing to return to normal cooling for an extended period, significantly impacting the refrigerator's cooling performance. While aluminum foil heaters can actively defrost, their heating efficiency remains low. Furthermore, aluminum foil heaters need to be fitted against the inner wall of the evaporator compartment, which can cause the inner liner of the refrigerator compartment to yellow or even crack after prolonged use. Simultaneously, the heat generated by the aluminum foil heaters is directly conducted to the refrigerator compartment side through the inner liner wall, causing a significant increase in refrigerator compartment temperature and affecting the quality of stored food. These factors combined result in defrosting efficiency, refrigerator compartment temperature rise suppression, and temperature stability deficiencies in existing solutions, making it difficult to meet the requirements of high-quality refrigerators for defrosting performance and temperature control accuracy. Summary of the Invention

[0005] This application provides a defrosting device, a defrosting control method, and a storage medium to solve the technical problems of low defrosting efficiency, large temperature rise in the refrigerator compartment evaporator, and poor temperature stability in existing dual-system refrigerators.

[0006] To achieve the above objectives, in a first aspect, this application provides a defrosting device for a dual-system refrigerator, the refrigerator comprising: a refrigerator compartment and an evaporator located on the refrigerator compartment side, the defrosting device comprising: Low-temperature space, which is located inside the refrigerator compartment; The semiconductor module has a cold end and a hot end, with the cold end facing the low-temperature space; A dedicated air duct connects the space where the hot end is located with the evaporator compartment, so that the hot end and the evaporator are in the same closed airflow circulation path. Cooling fans are connected in series in the airflow path of a dedicated air duct; The first temperature sensor is located on the evaporator; The second temperature sensor is located in the low-temperature space. The controller is electrically connected to the semiconductor module, the cooling fan, the first temperature sensor, and the second temperature sensor, respectively. The controller is configured as follows: In response to the start of the refrigerator's defrosting function, the electromagnetic switching valve of the refrigerator is controlled to switch direction to cut off the refrigerant passage of the evaporator; The semiconductor module is powered on to cool the low-temperature space through the cold end and generate heat through the hot end. Control the start of the cooling fan to transfer the heat from the hot end to the evaporator along a dedicated air duct; Obtain the first evaporator temperature value detected by the first temperature sensor; When the temperature of the first evaporator reaches the first preset temperature value, the control semiconductor module is powered off. Control the solenoid switching valve to reverse in order to restore the refrigerant passage of the evaporator; The temperature value of the second evaporator detected by the first temperature sensor and the temperature value of the low-temperature space detected by the second temperature sensor are obtained. When the temperature of the second evaporator is lower than the second preset temperature value and the temperature of the low-temperature space is lower than the third preset temperature value, the cooling fan is controlled to stop.

[0007] Preferably, the semiconductor module is embedded in the insulation layer of the cold storage compartment, with the cold end protruding from the inner wall of the insulation layer and facing the low-temperature space, and the hot end protruding from the outer wall of the insulation layer and located in a dedicated air duct.

[0008] Preferably, a cold end heat sink is installed on the cold end, and a cold end fan is provided on the cold end heat sink.

[0009] Preferably, the controller is also configured to: control the cold end fan to start during the operation of the semiconductor module to enhance the cooling effect of the cold end on the low-temperature space.

[0010] Preferably, a heat sink is installed on the hot end, and a hot end fan is provided on the heat sink.

[0011] Preferably, the controller is further configured to start the hot-end fan while controlling the cooling fan to start, so as to enhance the heat dissipation efficiency of the hot end.

[0012] Preferably, the controller is further configured to: during the operation of the semiconductor module, if the evaporator temperature value detected by the first temperature sensor does not reach the first preset temperature value within a preset time, control the semiconductor module to cut off the power and issue a fault warning signal.

[0013] Preferably, the controller is further configured to: after the control semiconductor module is powered off, delay for a first preset time before controlling the electromagnetic switching valve to reverse in order to restore the refrigerant passage of the evaporator.

[0014] Secondly, this application provides a defrosting control method applied to the defrosting apparatus of the first aspect, comprising: In response to the start of the refrigerator's defrosting function, the electromagnetic switching valve of the refrigerator is controlled to switch direction to cut off the refrigerant passage of the evaporator; The semiconductor module is powered on to cool the low-temperature space through the cold end and generate heat through the hot end. Control the start of the cooling fan to transfer the heat from the hot end to the evaporator along a dedicated air duct; Obtain the first evaporator temperature value detected by the first temperature sensor; When the temperature of the first evaporator reaches the first preset temperature value, the control semiconductor module is powered off. Control the solenoid switching valve to reverse in order to restore the refrigerant passage of the evaporator; The temperature value of the second evaporator detected by the first temperature sensor and the temperature value of the low-temperature space detected by the second temperature sensor are obtained. When the temperature of the second evaporator is lower than the second preset temperature value and the temperature of the low-temperature space is lower than the third preset temperature value, the cooling fan is controlled to stop.

[0015] Thirdly, this application provides a computer-readable storage medium comprising: at least one computer instruction for causing a computer to perform the defrosting control method of the second aspect.

[0016] As can be seen from the above technical solutions, this application provides a defrosting device, control method, and storage medium. The device releases cold energy to the low-temperature space through the cold end of the semiconductor module and directs heat to the evaporator compartment for convection defrosting through a dedicated air duct at the hot end. The evaporator temperature and the low-temperature space temperature are detected by the first temperature sensor and the second temperature sensor, respectively. The controller controls the defrosting process according to the evaporator temperature and coordinates the delayed shutdown of the cooling fan according to the evaporator temperature and the low-temperature space temperature. This achieves simultaneous optimization of defrosting efficiency improvement and low-temperature space temperature rise suppression, effectively improving the defrosting performance and temperature control stability of the refrigerator. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the defrosting device provided in an embodiment of this application; Figure 2 This is a flowchart of the defrosting control method provided in an embodiment of this application.

[0019] Figure label: Among them, 1. Cold storage compartment; 2. Evaporator; 3. Low temperature space; 4. Semiconductor module; 41. Cold end; 411. Cold end heat sink; 412. Cold end fan; 42. Hot end; 421. Hot end heat sink; 422. Hot end fan; 5. Dedicated air duct; 6. Cooling fan; 7. First temperature sensor; 8. Second temperature sensor; 9. Controller. Detailed Implementation

[0020] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application.

[0021] 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.

[0022] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] 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.

[0024] In the field of refrigerator temperature control technology, dual-system refrigerators have gradually become the mainstream choice for household food storage due to their advantages such as independent cooling of the refrigerator and freezer compartments, reduced odor mixing, and better preservation. During operation, frost gradually condenses on the surface of the evaporator in the refrigerator compartment of a dual-system refrigerator. This frost accumulation leads to decreased heat exchange efficiency, poorer cooling performance, and increased energy consumption, thus requiring regular defrosting. Currently, there are two main methods for defrosting the refrigerator compartment evaporator in dual-system refrigerators: one is natural defrosting, where the frost on the evaporator surface melts naturally due to ambient temperature while the compressor is off; the other is using an aluminum foil heater near the evaporator to heat it for defrosting. However, natural defrosting lacks active heating, resulting in extremely low defrosting efficiency. Especially when users place large amounts of high-moisture food in the refrigerator compartment and the external ambient temperature is low, severe frost buildup occurs on the evaporator, and the natural defrosting time is too long. The evaporator cannot return to normal cooling for an extended period, seriously affecting the cooling effect of the refrigerator compartment. While aluminum foil heaters can actively defrost, their heating efficiency remains relatively low. Furthermore, these heaters need to be fitted directly against the inner wall of the evaporator compartment, which can lead to yellowing or even cracking of the refrigerator's inner liner after prolonged use. Simultaneously, the heat generated by the aluminum foil heaters is directly conducted to the refrigerator compartment side through the inner liner wall, causing a significant increase in temperature and affecting the quality of stored food. These combined factors result in shortcomings in defrosting efficiency, refrigerator temperature rise suppression, and temperature stability of existing solutions, making it difficult to meet the defrosting performance and temperature control precision requirements of high-quality refrigerators.

[0025] To address the aforementioned problems, this application provides a defrosting device for a dual-system refrigerator. The refrigerator's refrigerator compartment and freezer compartment each have independent evaporators. An electromagnetic switching valve controls the refrigerant flow to the corresponding evaporator, achieving independent cooling for the refrigerator and freezer compartments. See also... Figure 1 The defrosting device includes a cold storage compartment 1, an evaporator 2, a low-temperature space 3, a semiconductor module 4, a dedicated air duct 5, a cooling fan 6, a first temperature sensor 7, a second temperature sensor 8, and a controller 9.

[0026] The refrigerator compartment 1 is the main storage space in the refrigerator for everyday food items. The evaporator 2 is located on the back side of the refrigerator compartment 1. The evaporator 2 is the core heat exchange component of the refrigeration system. Refrigerant flows inside the evaporator 2; as it passes through, it absorbs heat from the refrigerator compartment 1, lowering its temperature to a set range. The side and back walls of the refrigerator compartment 1 are filled with an insulation layer to prevent heat exchange between the interior and exterior environments. The low-temperature space 3 is located within the refrigerator compartment 1. This low-temperature space 3 is a designated sub-area within the refrigerator compartment 1, used to store food items sensitive to temperature fluctuations. The low-temperature space 3 is separated from other areas of the refrigerator compartment 1 by partitions or insulation layers, ensuring a relatively stable temperature within it during defrosting.

[0027] Semiconductor module 4 has a cold end 41 and a hot end 42. The cold end 41 faces the low-temperature space 3. Semiconductor module 4 is a solid-state thermoelectric conversion device based on the Peltier effect. When semiconductor module 4 is powered on, a thermoelectric effect is generated between the P-type and N-type semiconductor materials inside it, causing heat to be transferred from one side of semiconductor module 4 to the other. The cold end 41 absorbs heat from the low-temperature space 3, lowering the temperature of the low-temperature space 3, while the hot end 42 releases heat into the air in the dedicated air duct 5, raising the air temperature in the space where the hot end 42 is located. When semiconductor module 4 is working, both the cold end 41 and the hot end 42 function simultaneously, generating the heat required for defrosting while simultaneously producing a cooling effect on the low-temperature space 3. Semiconductor module 4 requires no refrigerant and has no moving mechanical parts, offering advantages such as fast response speed and high control precision.

[0028] A dedicated air duct 5 connects the space containing the hot end 42 to the chamber of the evaporator 2, placing the hot end 42 and the evaporator 2 within the same closed airflow circulation path. The dedicated air duct 5 is an airflow path formed by a partition or shell. One end of the dedicated air duct 5 connects to the space containing the hot end 42, and the other end connects to the chamber of the evaporator 2. The walls of the dedicated air duct 5 are made of heat-insulating material, or have an insulation layer covering their outer walls, to reduce heat loss to the surrounding environment during transport. Because the dedicated air duct 5 only connects the space containing the hot end 42 to the chamber of the evaporator 2, the heat generated by the hot end 42 is confined within the dedicated air duct 5 and flows directionally, efficiently guided to the surface of the evaporator 2 for defrosting.

[0029] A cooling fan 6 is installed within a dedicated air duct 5. The cooling fan 6 is located in the airflow path between the space containing the hot end 42 and the chamber of the evaporator 2. The cooling fan 6 is either an axial flow fan or a centrifugal fan. When powered on, the cooling fan 6 rotates, generating driving force that directs the airflow within the dedicated air duct 5. After the cooling fan 6 starts, the hot air, driven by the cooling fan 6, flows along the dedicated air duct 5 to the chamber of the evaporator 2 and is blown onto the surface of the evaporator 2 to defrost.

[0030] The first temperature sensor 7 is disposed on the evaporator 2. The first temperature sensor 7 is a thermocouple-type temperature sensor or a thermistor-type temperature sensor. The first temperature sensor 7 is mounted in contact with the surface of the evaporator 2 and can detect the temperature value of the evaporator 2 surface in real time. The second temperature sensor 8 is disposed inside the low-temperature space 3. The second temperature sensor 8 is the same type of temperature sensor as the first temperature sensor 7. The second temperature sensor 8 is installed inside the low-temperature space 3 and can detect the air temperature value inside the low-temperature space 3 in real time.

[0031] The controller 9 is electrically connected to the semiconductor module 4, the cooling fan 6, the first temperature sensor 7, and the second temperature sensor 8. The controller 9 receives the evaporator temperature signal output by the first temperature sensor 7 and the low-temperature space temperature signal output by the second temperature sensor 8. The controller 9 generates control commands based on the temperature signals, which are used to control the power-on / off state of the semiconductor module 4 and the start / stop state of the cooling fan 6.

[0032] Controller 9 is configured as follows: In response to the start of the refrigerator's defrosting function, the electromagnetic switching valve of the refrigerator is controlled to switch direction to cut off the refrigerant passage of the evaporator 2.

[0033] The control semiconductor module 4 is powered on to cool the low-temperature space 3 through the cold end 41 and generate heat through the hot end 42.

[0034] The cooling fan 6 is started to transfer the heat from the hot end 42 to the evaporator 2 along the dedicated air duct 5.

[0035] Obtain the temperature value of the first evaporator detected by the first temperature sensor 7.

[0036] When the temperature of the first evaporator reaches the first preset temperature value, the control semiconductor module 4 is powered off.

[0037] Control the solenoid switching valve to reverse in order to restore the refrigerant passage of evaporator 2.

[0038] The temperature value of the second evaporator detected by the first temperature sensor 7 and the temperature value of the low-temperature space detected by the second temperature sensor 8 are obtained.

[0039] When the temperature of the second evaporator is lower than the second preset temperature and the temperature of the low-temperature space is lower than the third preset temperature, the cooling fan 6 is stopped.

[0040] Specifically, in response to the refrigerator's defrosting function activation, controller 9 begins executing the constant-temperature defrosting control process. Controller 9 sends a reversing signal to the refrigerator's solenoid switching valve. The solenoid switching valve is installed between the compressor outlet and the inlets of the refrigerator compartment evaporator 2 and the freezer compartment evaporator. The solenoid switching valve controls the flow direction of refrigerant between the refrigerator compartment evaporator 2 and the freezer compartment evaporator. When the refrigerant is directed to the refrigerator compartment evaporator 2, the refrigerator compartment 1 receives cooling. When the refrigerant is directed to the freezer compartment evaporator, the refrigerator compartment evaporator 2 stops supplying cooling. After controller 9 sends the reversing signal to the solenoid switching valve, the valve switches to the position where refrigerant is directed to the freezer compartment evaporator, the refrigerant stops flowing to the refrigerator compartment evaporator 2, and the evaporator 2 stops supplying cooling, preparing for defrosting.

[0041] The controller 9 sends a conduction signal to the power supply circuit of the semiconductor module 4, energizing the semiconductor module 4. After the semiconductor module 4 is energized, the cold end 41 absorbs heat from the low-temperature space 3, lowering its temperature. The hot end 42 releases heat into the air within the dedicated air duct 5, raising the air temperature in the space containing the hot end 42. When the semiconductor module 4 is operating, both the cold end 41 and the hot end 42 function simultaneously, generating the heat required for defrosting while simultaneously cooling the low-temperature space 3.

[0042] The controller 9 sends a start signal to the cooling fan 6, energizing and starting the cooling fan 6. The cooling fan 6 is located in the airflow path between the space where the hot end 42 is located and the chamber of the evaporator 2. After being energized, the cooling fan 6 rotates, generating driving force to drive the air in the dedicated air duct 5 to flow in a specific direction. After the cooling fan 6 starts, the hot air, driven by the cooling fan 6, flows along the dedicated air duct 5 to the chamber of the evaporator 2, and the hot air is blown onto the surface of the evaporator 2. The hot air exchanges heat with the frost on the surface of the evaporator 2, transferring heat to the frost and causing the frost to melt into water.

[0043] During the defrosting process, the controller 9 reads the first evaporator temperature value output by the first temperature sensor 7 in real time. The first temperature sensor 7 is attached to the surface of the evaporator 2 and detects the temperature change of the evaporator 2 surface in real time. The controller 9 compares the read first evaporator temperature value with a first preset temperature value. The first preset temperature value ranges from 2℃ to 10℃, for example, it can be set to 5℃. When the first evaporator temperature value rises to the first preset temperature value, it indicates that the frost on the surface of the evaporator 2 has completely melted and defrosting is complete. At this time, the controller 9 sends a power-off signal to the power supply circuit of the semiconductor module 4, and the semiconductor module 4 stops working.

[0044] The controller 9 sends a reversing signal to the refrigerator's electromagnetic switching valve, causing the valve to switch to the position where the refrigerant is guided to the evaporator 2 in the refrigerator compartment. After the electromagnetic switching valve switches to the correct position, the refrigerant is guided back to the evaporator 2 in the refrigerator compartment, and the evaporator 2 resumes cooling and starts cooling again.

[0045] After the evaporator 2 resumes cooling, the controller 9 continues to read the second evaporator temperature value detected by the first temperature sensor 7 and the low-temperature space temperature value detected by the second temperature sensor 8. The controller 9 compares the read second evaporator temperature value with the second preset temperature value and the low-temperature space temperature value with the third preset temperature value. The second preset temperature value ranges from -30℃ to 0℃, for example, it can be set to -5℃. The third preset temperature value is the shutdown temperature value corresponding to the setting of the low-temperature space 3 before defrosting. For example, when the low-temperature space 3 is set to shut down at 2℃, the third preset temperature value is 2℃; when it is set to shut down at 5℃, the third preset temperature value is 5℃. When the second evaporator temperature value is lower than the second preset temperature value and the low-temperature space temperature value is lower than the third preset temperature value, it indicates that the residual heat of the hot end 42 has been fully removed and the temperature of the low-temperature space 3 has reached the set temperature, and the cooling fan 6 does not need to continue operating. At this time, the controller 9 sends a shutdown signal to the cooling fan 6, and the cooling fan 6 stops operating.

[0046] As can be seen from the above technical solution, in this embodiment, the heat from the hot end 42 is directionally transported to the surface of the evaporator 2 via a dedicated air duct 5 for convection defrosting. The hot end 42 is not attached to the inner wall of the refrigerator compartment 1, avoiding the temperature rise caused by direct conduction to the refrigerator compartment 1 through the inner wall, as is the case with aluminum foil heaters. At the same time, the cold end 41 continuously cools the low-temperature space 3 to compensate for the defrosting temperature rise. The cooling fan 6 is delayed and shut down to force cooling of the hot end 42 by the evaporator 2 to restore the cooling capacity after the cooling supply, preventing residual heat from being conducted to the cold end 41. This effectively improves the defrosting efficiency and ensures the temperature stability of the low-temperature space 3 throughout the defrosting process.

[0047] In some embodiments, see Figure 1 The semiconductor module 4 is embedded in the insulation layer of the cold storage compartment 1. The back wall or side wall of the cold storage compartment 1 is filled with an insulation layer, which is used to isolate the heat exchange between the inside of the cold storage compartment 1 and the external environment. The semiconductor module 4 is embedded inside the insulation layer, with the cold end 41 of the semiconductor module 4 protruding from the inner wall surface of the insulation layer and the hot end 42 of the semiconductor module 4 protruding from the outer wall surface of the insulation layer.

[0048] Specifically, the cold end 41 protrudes from the inner wall of the insulation layer and faces the low-temperature space 3, allowing it to be directly exposed to the interior of the low-temperature space 3. The cooling energy generated by the cold end 41 can be directly released into the low-temperature space 3. The hot end 42 protrudes from the outer wall of the insulation layer and is located within the dedicated air duct 5, allowing it to be directly exposed to the interior of the dedicated air duct 5. The heat generated by the hot end 42 can be directly transferred to the air within the dedicated air duct 5. The semiconductor module 4 is embedded within the insulation layer. No additional heat-conducting structures are needed between the cold end 41 and the low-temperature space 3, or between the hot end 42 and the dedicated air duct 5. This reduces the loss of cooling energy during the transfer between the cold end 41 and the low-temperature space 3, and also reduces the loss of heat during the transfer between the hot end 42 and the dedicated air duct 5. This improves the cooling efficiency of the cold end 41 and the heating efficiency of the hot end 42, while simplifying the assembly structure of the device and saving internal space in the refrigerator.

[0049] In some embodiments, see Figure 1 A cold-end heat sink 411 is installed on the cold end 41, and a cold-end fan 412 is mounted on the cold-end heat sink 411. The cold-end heat sink 411 adopts a finned structure and is attached to the surface of the cold end 41. The cold-end heat sink 411 is used to increase the heat exchange area between the cold end 41 and the air in the low-temperature space 3. The cold-end fan 412 is installed on one side of the cold-end heat sink 411, with the air outlet side of the cold-end fan 412 facing the low-temperature space 3. The cold-end fan 412 is used to drive the air in the low-temperature space 3 to flow through the cold-end heat sink 411, so as to enhance the convective heat transfer between the cold end 41 and the air in the low-temperature space 3.

[0050] In some embodiments, the controller 9 is further configured to control the cold end fan 412 to start during the operation of the semiconductor module 4 while it is powered on, so as to enhance the cooling effect of the cold end 41 on the low-temperature space 3.

[0051] Specifically, during the operation of the semiconductor module 4, the controller 9 sends a start signal to the cold-end fan 412, which then powers on and operates. Once operational, the cold-end fan 412 drives air within the cryogenic space 3 to flow across the surface of the cold-end heat sink 411. The air exchanges heat with the heat sink 411, lowering its temperature. The cooled air then flows into the interior of the cryogenic space 3, further reducing its temperature. The cold-end fan 412 operates continuously throughout the entire operation of the semiconductor module 4, ensuring that the cooling energy generated by the cold end 41 is continuously transferred to the interior of the cryogenic space 3, thus maintaining a stable temperature within the cryogenic space 3.

[0052] In some embodiments, see Figure 1A heat sink 421 is mounted on the hot end 42, and a hot end fan 422 is mounted on the heat sink 421. The heat sink 421 has a finned structure and is attached to the surface of the hot end 42. The heat sink 421 is used to increase the heat exchange area between the hot end 42 and the air in the dedicated air duct 5. The hot end fan 422 is mounted on one side of the heat sink 421, with the exhaust side of the hot end fan 422 facing the interior of the dedicated air duct 5. The hot end fan 422 is used to drive the air in the dedicated air duct 5 to flow through the heat sink 421, thereby enhancing the convective heat transfer between the hot end 42 and the air in the dedicated air duct 5.

[0053] In some embodiments, the controller 9 is further configured to start the hot-end fan 422 while controlling the cooling fan 6 to start, so as to enhance the heat dissipation efficiency of the hot end 42.

[0054] Specifically, the controller 9 sends a start signal to the cooling fan 6 and simultaneously sends a start signal to the hot-end fan 422, causing both the cooling fan 6 and the hot-end fan 422 to operate simultaneously. After the hot-end fan 422 starts operating, it drives the air in the dedicated air duct 5 to flow over the surface of the hot-end heat sink 421. The air exchanges heat with the hot-end heat sink 421, causing its temperature to rise. The heated air then flows into the interior of the dedicated air duct 5 under the drive of the hot-end fan 422. At the same time, the cooling fan 6 drives the air in the dedicated air duct 5 to flow in a directional direction. The heated air then flows along the dedicated air duct 5 to the chamber of the evaporator 2 under the drive of the cooling fan 6. The synchronous operation of the hot-end fan 422 and the cooling fan 6 allows the heat generated by the hot end 42 to quickly diffuse into the air in the dedicated air duct 5, and is then transported by the cooling fan 6 along the dedicated air duct 5 to the surface of the evaporator 2, shortening the defrosting time.

[0055] In some embodiments, the controller 9 is further configured to: control the semiconductor module 4 to power off and issue a fault warning signal when the evaporator temperature value detected by the first temperature sensor 7 does not reach the first preset temperature value within a preset time during the operation of the semiconductor module 4.

[0056] Specifically, controller 9 starts timing during the operation of semiconductor module 4 while it is powered on. Controller 9 reads the temperature value of the first evaporator detected by the first temperature sensor 7 in real time. Controller 9 compares the read first evaporator temperature value with a first preset temperature value, and simultaneously monitors whether the timer has reached the preset time. The preset time can be set according to the frosting condition of evaporator 2 and defrosting experience, for example, it can be set to 10 to 30 minutes. If the first evaporator temperature value does not reach the first preset temperature value within the preset time, it indicates that the defrosting process of evaporator 2 is abnormal, and the frost on the surface of evaporator 2 has not melted properly. At this time, controller 9 sends a power-off signal to the power supply circuit of semiconductor module 4, and semiconductor module 4 stops working. Controller 9 also sends a fault warning signal to the refrigerator's display panel or buzzer, and the display panel displays defrosting fault information or the buzzer sounds a warning sound. This timeout protection mechanism prevents semiconductor module 4 from continuously heating up due to prolonged operation, preventing increased energy consumption and component damage caused by abnormal defrosting.

[0057] In some embodiments, the controller 9 is further configured to: after the control semiconductor module 4 is powered off, delay for a first preset time before controlling the electromagnetic switching valve to reverse in order to restore the refrigerant passage of the evaporator 2.

[0058] Specifically, the controller 9 starts timing after sending a power-off signal to the power supply circuit of the semiconductor module 4. During the power-off period of the semiconductor module 4, the cooling fan 6 continues to operate. The cooling fan 6 continuously drives the airflow in the dedicated air duct 5, using the residual cold air in the pre-cooling compartment of the evaporator 2 to forcibly cool the hot end 42, further dissipating the residual heat of the hot end 42. The controller 9 sends a reversing signal to the solenoid switching valve after a first preset time delay. The first preset time can be set from 30 seconds to 120 seconds, for example, it can be set to 60 seconds. After receiving the reversing signal, the solenoid switching valve switches to the position of restoring the cooling supply of the evaporator 2, and the refrigerant is guided back to the evaporator 2 in the refrigerator compartment, and the evaporator 2 resumes cooling. This delayed recovery control ensures that the residual heat of the hot end 42 is fully dissipated before the evaporator 2 resumes cooling, reducing the impact of the residual heat of the hot end 42 on the temperature of the low-temperature space 3 and ensuring the temperature stability of the low-temperature space 3.

[0059] In some embodiments, see Figure 2 This application also provides a defrosting control method applied to the defrosting device of the above embodiments, comprising: S100, in response to the start of the refrigerator's defrosting function, controls the refrigerator's electromagnetic switching valve to switch direction to cut off the refrigerant passage of the evaporator 2. S200 controls the semiconductor module 4 to be powered on and operated, so as to cool the low-temperature space 3 through the cold end 41 and generate heat through the hot end 42; S300, control the start of the cooling fan 6 to transport the heat from the hot end 42 to the evaporator 2 along the dedicated air duct 5; S400: Obtain the first evaporator temperature value detected by the first temperature sensor 7; S500: When the temperature of the first evaporator reaches the first preset temperature value, the control semiconductor module 4 is powered off. S600, control the solenoid switching valve to reverse in order to restore the refrigerant passage of evaporator 2; S700: Obtain the temperature value of the second evaporator detected by the first temperature sensor 7, and the temperature value of the low-temperature space detected by the second temperature sensor 8; S800: When the temperature of the second evaporator is lower than the second preset temperature and the temperature of the low-temperature space is lower than the third preset temperature, control the cooling fan 6 to stop.

[0060] For details, please refer to the relevant description of the control logic in the above-mentioned defrosting device embodiments, which will not be repeated here.

[0061] In some embodiments, this application also provides a computer-readable storage medium. The computer-readable storage medium includes at least one computer instruction. The computer instruction is used to cause a computer to perform the steps of the defrosting control method provided in the above embodiments.

[0062] When computer instructions are loaded and executed by the computer, the computer can perform the steps of the defrosting control method. These steps include: in response to the activation of the refrigerator's defrosting function, controlling the refrigerator's electromagnetic switching valve to reverse and cut off the refrigerant passage of the evaporator 2; controlling the semiconductor module 4 to operate, so as to cool the low-temperature space 3 through the cold end 41 and generate heat through the hot end 42; controlling the cooling fan 6 to start, so as to transport the heat from the hot end 42 to the evaporator 2 along the dedicated air duct 5; acquiring the first evaporator temperature value detected by the first temperature sensor 7; when the first evaporator temperature value reaches a first preset temperature value, controlling the semiconductor module 4 to de-energize; controlling the electromagnetic switching valve to reverse and restore the refrigerant passage of the evaporator 2; acquiring the second evaporator temperature value detected by the first temperature sensor 7 and the low-temperature space temperature value detected by the second temperature sensor 8; when the second evaporator temperature value is lower than a second preset temperature value and the low-temperature space temperature value is lower than a third preset temperature value, controlling the cooling fan 6 to stop.

[0063] Specifically, the computer-readable storage medium can be a USB flash drive, external hard drive, read-only memory, random access memory, magnetic disk, or optical disk, or any other medium capable of storing program code. When the processor or microcontroller in the controller 9 of the computer loads and executes the aforementioned computer instructions, the computer, in response to the activation of the refrigerator's defrosting function, sends a reversing signal to the refrigerator's electromagnetic switching valve, causing the valve to switch to the position where the refrigerant is guided to the freezer evaporator, stopping the refrigerant from flowing to the refrigerator evaporator 2, and the evaporator 2 stops supplying cooling. The computer sends a conduction signal to the power supply circuit of the semiconductor module 4, energizing the semiconductor module 4. After the semiconductor module 4 is energized, the cold end 41 absorbs heat from the low-temperature space 3, lowering the temperature of the low-temperature space 3, while the hot end 42 releases heat to the air in the dedicated air duct 5, raising the air temperature in the space where the hot end 42 is located. The computer sends a start signal to the cooling fan 6, energizing and starting the cooling fan 6. After the cooling fan 6 starts, it drives the air in the dedicated air duct 5 to flow in a specific direction, and the heat generated by the hot end 42 is transported along the dedicated air duct 5 to the evaporator 2 compartment. During the defrosting process, the computer reads the first evaporator temperature value output by the first temperature sensor 7 in real time and compares it with a first preset temperature value. When the first evaporator temperature rises to the first preset temperature value, the computer sends a power-off signal to the power supply circuit of the semiconductor module 4, and the semiconductor module 4 stops working. The computer sends a reversing signal to the refrigerator's electromagnetic switching valve, causing the electromagnetic switching valve to switch to the position where the refrigerant is guided to the refrigerator compartment evaporator 2. The refrigerant is then guided back to the refrigerator compartment evaporator 2, and the evaporator 2 resumes cooling and starts cooling again. After the evaporator 2 resumes cooling, the computer continues to read the second evaporator temperature value detected by the first temperature sensor 7 and the low-temperature space temperature value detected by the second temperature sensor 8, and compares the second evaporator temperature value with the second preset temperature value and the low-temperature space temperature value with a third preset temperature value. When the second evaporator temperature value is lower than the second preset temperature value and the low-temperature space temperature value is lower than the third preset temperature value, the computer sends a shutdown signal to the cooling fan 6, and the cooling fan 6 stops operating.

[0064] As can be seen from the above technical solution, the computer-readable storage medium provided in this embodiment stores computer instructions that implement the above control method. When the processor executes these instructions, it can control the on / off state of the semiconductor module 4 and the start / stop of the cooling fan 6 based on the evaporator temperature. It utilizes a dedicated air duct 5 to directionally transport the heat from the hot end 42 to the surface of the evaporator 2 for convection defrosting. After defrosting, it coordinates the delayed shutdown of the cooling fan 6 based on the evaporator temperature and the low-temperature space temperature. This embodiment solves the technical problems of low defrosting efficiency due to the lack of active heating in natural defrosting methods and the temperature rise in the refrigerator compartment caused by heat from the aluminum foil heater being conducted through the inner wall of the refrigerator. It effectively improves the defrosting performance and temperature control stability of the refrigerator, achieving simultaneous optimization of defrosting efficiency improvement and low-temperature space temperature rise suppression.

[0065] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A defrosting device applied to a double-system refrigerator, the refrigerator comprising: A refrigerator compartment (1), and an evaporator (2) located on the side of the refrigerator compartment (1), characterized in that the defrosting device comprises: Low-temperature space (3), which is located inside the cold storage room (1); Semiconductor module (4) having a cold end (41) and a hot end (42), the cold end (41) facing the low temperature space (3). A dedicated air duct (5) connects the space where the hot end (42) is located with the chamber of the evaporator (2) so that the hot end (42) and the evaporator (2) are in the same closed airflow circulation path; Cooling fan (6), the cooling fan (6) is connected in series in the airflow path of the dedicated air duct (5); The first temperature sensor (7) is disposed on the evaporator (2); The second temperature sensor (8) is disposed in the low temperature space (3); The controller (9) is electrically connected to the semiconductor module (4), the cooling fan (6), the first temperature sensor (7), and the second temperature sensor (8), respectively. The controller (9) is configured to: In response to the activation of the defrosting function of the refrigerator, the electromagnetic switching valve of the refrigerator is controlled to switch to cut off the refrigerant passage of the evaporator (2); The semiconductor module (4) is powered on to cool the low-temperature space (3) through the cold end (41) and generate heat through the hot end (42); The cooling fan (6) is started to transport the heat from the hot end (42) to the evaporator (2) along the dedicated air duct (5). Obtain the temperature value of the first evaporator detected by the first temperature sensor (7); When the temperature of the first evaporator reaches the first preset temperature value, the semiconductor module (4) is powered off. Control the solenoid switching valve to reverse in order to restore the refrigerant passage of the evaporator (2); The temperature value of the second evaporator detected by the first temperature sensor (7) and the temperature value of the low-temperature space detected by the second temperature sensor (8) are obtained. When the temperature of the second evaporator is lower than the second preset temperature value and the temperature of the low-temperature space is lower than the third preset temperature value, the cooling fan (6) is controlled to stop.

2. The defrosting device according to claim 1, characterized in that The semiconductor module (4) is embedded in the insulation layer of the cold storage chamber (1), the cold end (41) protrudes from the inner wall of the insulation layer and faces the low temperature space (3), and the hot end (42) protrudes from the outer wall of the insulation layer and is located in the dedicated air duct (5).

3. The defrosting device according to claim 1, wherein A cold end heat sink (411) is installed on the cold end (41), and a cold end fan (412) is provided on the cold end heat sink (411).

4. The defrosting device according to claim 3, wherein The controller (9) is also configured to control the cold end fan (412) to start during the operation of the semiconductor module (4) to enhance the cooling effect of the cold end (41) on the low temperature space (3).

5. The defrosting device according to claim 1, characterized in that, A heat sink (421) is installed on the hot end (42), and a heat sink (421) is provided on the hot end fan (422).

6. The defrosting device according to claim 5, characterized in that, The controller (9) is also configured to start the hot end fan (422) while controlling the cooling fan (6) to start, so as to enhance the heat dissipation efficiency of the hot end (42).

7. The defrosting device according to claim 1, characterized in that, The controller (9) is also configured to: during the operation of the semiconductor module (4) when the evaporator temperature value detected by the first temperature sensor (7) does not reach the first preset temperature value within a preset time, control the semiconductor module (4) to cut off the power and issue a fault warning signal.

8. The defrosting device according to claim 1, characterized in that, The controller (9) is also configured to: after the semiconductor module (4) is powered off, delay for a first preset time, and then control the electromagnetic switching valve to switch to restore the refrigerant passage of the evaporator (2).

9. A defrosting control method, applied to the defrosting device according to any one of claims 1-8, characterized in that, include: In response to the start of the defrosting function of the refrigerator, the electromagnetic switching valve of the refrigerator is controlled to switch to cut off the refrigerant passage of the evaporator (2); The control semiconductor module (4) is powered on to cool the low-temperature space (3) through the cold end (41) and generate heat through the hot end (42); The heat dissipation fan (6) is started to transport the heat from the hot end (42) to the evaporator (2) along the dedicated air duct (5). Obtain the temperature value of the first evaporator detected by the first temperature sensor (7); When the temperature of the first evaporator reaches the first preset temperature value, the semiconductor module (4) is powered off. Control the solenoid switching valve to reverse in order to restore the refrigerant passage of the evaporator (2); The temperature value of the second evaporator detected by the first temperature sensor (7) and the temperature value of the low-temperature space detected by the second temperature sensor (8) are obtained. When the temperature of the second evaporator is lower than the second preset temperature value and the temperature of the low-temperature space is lower than the third preset temperature value, the cooling fan (6) is controlled to stop.

10. A computer-readable storage medium, characterized in that, include: At least one computer instruction, said computer instruction being used to cause the computer to perform the defrosting control method as described in claim 9.

Images