Constant-temperature freezing refrigerator control system

Abstract

The invention provides a constant-temperature freezing refrigerator control system which comprises a refrigerating chamber and a freezing chamber, and the freezing chamber is located below the refrigerating chamber. The air duct assembly is arranged on the side, away from a refrigerator door body, of the freezing chamber and on the top of the freezing chamber, an electric air door is arranged at an air supply outlet of the air duct assembly and the freezing chamber, the electric air door starts when the refrigerator is in a refrigeration mode, and the electric air door is closed when the refrigerator is in a defrosting mode; the refrigerator inner container is arranged on the inner wall of the refrigerating chamber and the inner wall of the freezing chamber, and the air duct assembly is arranged on the side, away from a refrigerator door body, of the refrigerator inner container. By means of the system, the problem that an existing refrigerator control technology cannot effectively avoid temperature rise in the refrigerator due to defrosting is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerator control, in particular to a constant-temperature freezing refrigerator control system. BACKGROUND

[0002] At present, the air-cooled refrigerator has gradually replaced the traditional direct-cooled refrigerator and become the main force in the market.

[0003] The evaporator is an important component in the refrigeration system of the refrigerator and is the main body of heat exchange inside the compartment of the refrigerator. Especially with the gradual popularization of air-cooled refrigerators, finned evaporators are widely used. In the refrigeration process of the traditional air-cooled refrigerator, when the temperature of the surface of the evaporator in the compartment is lower than the dew point temperature of the air, the water vapor in the air in the compartment will gradually condense on the surface of the evaporator to form frost along with the air circulation. When the surface of the evaporator grows with the frost, the refrigeration effect gradually deteriorates, and when the frost layer grows to affect the air circulation, it will seriously affect the normal refrigeration of the refrigerator, so the air-cooled refrigerator needs to be defrosted regularly.

[0004] At present, when the refrigerator is started, the compressor starts refrigeration, and the fan is started after a delay. At this time, the hot air in the back air duct rises, and the cold air sinks. The hot air reaches the top and enters the top air duct to be transported to the inside of the freezer compartment, causing the overall temperature of the freezer compartment to rise.

[0005] The defrosting method of the refrigerator in the prior art is generally electric heating defrosting. The electric heater is arranged below the evaporator, and the evaporator is defrosted by heating the air to form natural convection and the heat radiation of the electric heating pipe. When the refrigerator enters the defrosting mode, the compressor is closed and the refrigerator stops refrigeration, and the electric heater is powered on to heat and defrost. Due to the heat circulation and heat radiation of the air in the air duct caused by the electric heater, the hot air rises and enters the top air duct and then enters the freezer compartment, causing the temperature of the freezer compartment to gradually rise during the defrosting of the refrigerator. The large fluctuation of the freezing temperature during the defrosting period affects the quality of food storage, especially the freshness of the food. SUMMARY

[0006] The present application provides a constant-temperature freezing refrigerator control system to solve the problem that the existing refrigerator control technology cannot effectively avoid the temperature rise inside the refrigerator caused by defrosting.

[0007] The system comprises: A refrigeration compartment and a freezing compartment, wherein the freezing compartment is located below the refrigeration compartment in a refrigerator body; An air duct assembly arranged on the side of the freezing compartment away from the refrigerator door body and the top of the freezing compartment, wherein the air duct assembly is provided with an electric damper at the air supply port of the freezing compartment and the refrigeration compartment, the electric damper starts when the refrigerator is in a refrigeration mode, and the electric damper is closed when the refrigerator is in a defrosting mode. The refrigerator liner is arranged on the inner wall of the refrigeration chamber and the freezing chamber, and the air duct assembly is arranged on the side of the refrigerator liner away from the refrigerator door body.

[0008] Preferably, the system further comprises: An evaporator arranged on the side of the refrigerator liner away from the refrigerator door body, the evaporator being configured to provide low-temperature gas for the refrigeration chamber and the freezing chamber when the refrigerator is in a refrigeration mode; An electric heater arranged on the evaporator, the electric heater being configured to provide heat for the evaporator when the refrigerator is in a defrosting mode.

[0009] Preferably, the air duct assembly further comprises: A back air duct arranged on the side of the freezing chamber away from the refrigerator door body; A top air duct arranged on the top of the freezing chamber, the top air duct being connected with the back air duct, the top air duct being in communication with the refrigeration chamber and the freezing chamber respectively, and the electric damper being arranged at the connection between the back air duct and the top air duct.

[0010] Preferably, the evaporator is connected with the back air duct.

[0011] Preferably, the air duct assembly further comprises: A cold storage module arranged in the top air duct, the cold storage module being configured to: Store refrigeration capacity when the refrigerator is in a refrigeration mode; Release the stored refrigeration capacity when the refrigerator is in a defrosting mode.

[0012] Preferably, the cold storage module has a cavity structure and a plurality of ventilation holes, and the cavity structure is filled with a cold storage agent.

[0013] Preferably, the phase transition point of the cold storage agent is in the range of -10°C to -18°C.

[0014] Preferably, the top air duct comprises: A top base plate arranged above the freezing chamber, the top base plate being arranged on the side of the refrigerator liner away from the freezing chamber; A top cover plate arranged above the top base plate, the cold storage module being connected with the side of the top cover plate close to the top base plate, and the bottom of the cold storage module and the top base plate having a preset distance.

[0015] Preferably, the top air duct further comprises: Thermal insulation foam is arranged in the space between the top base plate and the cold storage module.

[0016] Preferably, the top air duct further comprises: A top air inlet is arranged on one side of the top base plate, the top air duct communicates with the back air duct through the top air inlet, and the electric damper is arranged on the top air inlet. An upper air outlet is arranged on the top of the top cover plate, and the upper air outlet communicates the top air duct and the refrigeration chamber. A lower air outlet is arranged on the bottom of the top base plate, and the lower air outlet communicates the top air duct and the freezing chamber. A front air outlet is arranged on the side of the top base plate away from the top air inlet, and the front air outlet communicates the top air duct and the freezing chamber. A refrigeration return air inlet is arranged on the back air duct, and the refrigeration return air inlet is connected with the return air duct of the refrigeration chamber and the freezing chamber.

[0017] From the above, the application provides a constant temperature freezing refrigerator control system, which comprises a refrigeration chamber and a freezing chamber, the freezing chamber is located below the refrigeration chamber; an air duct assembly is arranged on the side of the freezing chamber away from the refrigerator door body and on the top of the freezing chamber, the air duct assembly is provided with an electric damper at the air supply inlet of the freezing chamber, the electric damper starts when the refrigerator is in a refrigeration mode, and the electric damper is closed when the refrigerator is in a defrosting mode; a refrigerator liner is arranged on the inner wall of the refrigeration chamber and the freezing chamber, and the air duct assembly is arranged on the side of the refrigerator liner away from the refrigerator door body. The above system solves the problem that the existing refrigerator control technology cannot effectively avoid the temperature rise in the refrigerator caused by defrosting. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 FIG. 1 is a perspective view of a constant temperature freezing refrigerator control system according to the application; Figure 2 FIG. 2 is a back cross-sectional view of a constant temperature freezing refrigerator control system according to the application; Figure 3 FIG. 3 is a side cross-sectional view of a constant temperature freezing refrigerator control system according to the application; Figure 4 An exploded view of a top-mounted air duct in a constant-temperature freezer refrigerator control system according to the present application; Figure 5 A structural schematic view of a top-mounted bottom plate in a constant-temperature freezer refrigerator control system according to the present application; Figure 6 A side view cross-sectional view of a top-mounted air duct in a constant-temperature freezer refrigerator control system according to the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0021] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the subsequently described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0022] It should be noted that in the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of the words "exemplary" or "for example" is intended to present relevant concepts in a concrete manner.

[0023] With the development of technology in the household refrigerator industry, air-cooled refrigerators have gradually replaced traditional direct-cooled refrigerators as the market's main force. This change is mainly due to the significant advantages of air-cooling technology in solving the frosting problem and improving user experience. Traditional direct-cooled refrigerators rely on natural convection to achieve heat exchange, which easily forms a frost layer on the surface of the evaporator. Users need to perform manual defrosting regularly, which not only complicates the operation, but also affects the refrigeration efficiency of the refrigerator. Air-cooled refrigerators, on the other hand, achieve more uniform refrigeration effects through the forced circulation of cold air by fans. However, from a technical perspective, the frosting problem has not been completely eliminated, but only shifted to the surface of the evaporator and handled through automated solutions.

[0024] The evaporator of a refrigerator, as a key component in the refrigeration system, bears the core function of indoor heat exchange. Especially with the popularization of air-cooled technology, finned evaporators have become the mainstream design, which increases the heat exchange area to improve refrigeration efficiency. However, this design also brings new technical challenges: when the evaporator surface temperature is lower than the air dew point temperature, indoor water vapor will condense on its surface and gradually form frost. The accumulation of frost layer hinders air flow and reduces heat conduction efficiency, ultimately leading to a significant decrease in refrigeration performance. Therefore, air-cooled refrigerators must be defrosted regularly to maintain normal operation.

[0025] The frosting phenomenon of air-cooled refrigerators is closely related to their working principle. During the refrigeration process, the evaporator surface temperature is usually much lower than the air dew point, which causes the water in the air to freeze on the evaporator fin surface. Over time, the frost layer gradually thickens, not only reducing the air flow cross-section, but also increasing the heat transfer resistance, leading to a decrease in refrigeration efficiency. When the frost layer accumulates to a certain extent, it will completely block the air passage, causing the refrigerator to lose refrigeration capacity. The essence of this problem lies in the inevitable phase change phenomenon in the heat exchange process, and existing technical solutions can only seek a balance between delaying the frosting speed and improving the defrosting efficiency.

[0026] It is worth noting that the frosting problem is particularly prominent in high-temperature and high-humidity environments. In the use environment, when the refrigerator door is frequently opened, a large amount of external humid air enters the box, exacerbating the frosting speed of the evaporator. In addition, the internal temperature setting of the refrigerator also affects the frosting degree, and lower evaporation temperature, although it improves the refrigeration efficiency, but will accelerate the formation of frost layer. These factors make the frosting problem a key difficulty that needs to be continuously optimized in the development process of air-cooled refrigerators.

[0027] Currently, the mainstream defrosting solution in the industry is the electric heating defrosting technology. This technology installs electric heating elements directly near the evaporator, and achieves defrosting through the formation of natural convection and thermal radiation effects by heating the air. When the refrigerator enters the defrosting mode, the compressor stops working, and the electric heater starts running, the heat generated melts the frost layer. Although this method is simple in structure and low in cost, it has obvious technical limitations.

[0028] In actual operation, electric heating defrosting can cause large temperature fluctuations in the freezer compartment. Especially during the start-up phase of the refrigerator, the compressor starts refrigeration and the fan runs with a delay, at this time the hot air rises and the cold air sinks in the air duct, the hot air enters the top air duct and is then transported into the freezer compartment, causing the internal temperature to rise. Similarly, during the defrosting process, the hot air generated by the electric heater enters the freezer compartment through the circulation system, causing the food to undergo repeated temperature changes. This temperature fluctuation can accelerate the loss of moisture and decomposition of nutrients in food, seriously affecting the preservation effect. Especially for high-end food such as seafood, meat, etc., temperature fluctuations can significantly reduce their food quality and nutritional value.

[0029] Based on the above problems, the present application provides the following embodiments.

[0030] Figure 1 A stereoscopic structural view of a constant-temperature freezing refrigerator control system of the present application.

[0031] Figure 2 A back cross-sectional view of a constant-temperature freezing refrigerator control system of the present application.

[0032] Figure 3 A side cross-sectional view of a constant-temperature freezing refrigerator control system of the present application.

[0033] Figure 4 An explosion view of a top-mounted air duct in a constant-temperature freezing refrigerator control system of the present application.

[0034] Figure 5 A structural schematic view of a top-mounted bottom plate in a constant-temperature freezing refrigerator control system of the present application.

[0035] Figure 6 A side cross-sectional view of a top-mounted air duct in a constant-temperature freezing refrigerator control system of the present application.

[0036] Referring to Figures 1 to 6 It can be known that the present embodiment provides a constant-temperature freezing refrigerator control system, which comprises: A refrigeration chamber 100 and a freezing chamber 200, which are arranged in a refrigerator cabinet, and the freezing chamber 200 is located below the refrigeration chamber 100.

[0037] Specifically, in the present embodiment, the refrigeration chamber 100 and the freezing chamber 200 are common chambers of a refrigerator, and their relative positions can be adjusted according to different requirements, but the corresponding subsequent components for controlling constant temperature also need to be adjusted correspondingly.

[0038] The system further comprises: An air duct assembly 300, which is arranged on a side of the freezing chamber 200 away from a refrigerator door body and on a top of the freezing chamber 200, and an electric air door 310 is arranged at an air supply port of the freezing chamber 200 and the refrigeration chamber 100, the electric air door 310 starts when the refrigerator is in a refrigeration mode, and the electric air door 310 is closed when the refrigerator is in a defrosting mode.

[0039] Specifically, in the present embodiment, the air duct assembly 300 is arranged on the inside of the refrigerator and on the top of the freezing chamber 200, so as to provide low-temperature air for the freezing chamber 200 and the refrigeration chamber 100, thereby realizing food preservation.

[0040] In the system, the operation mode of the refrigerator is mainly divided into a refrigeration mode and a defrosting mode. In the refrigeration mode, the air duct assembly 300 normally delivers low-temperature air to the freezing chamber 200 and the refrigerating chamber 100. In the defrosting mode, the internal temperature of the air duct assembly 300 increases due to the heat required for defrosting. Therefore, in order to avoid the temperature inside the freezing chamber 200 and the refrigerating chamber 100 from rising due to defrosting, an electric damper 310 is arranged at the air supply port of the air duct assembly 300 and the freezing chamber 200 and the refrigerating chamber 100. When the refrigerator is in the defrosting mode, the electric damper 310 is closed, thereby avoiding the delivery of excess heat to the freezing chamber 200 and the refrigerating chamber 100.

[0041] The system further comprises: A refrigerator liner 400 is arranged on the inner wall of the refrigerating chamber 100 and the freezing chamber 200, and the air duct assembly 300 is arranged on the side of the refrigerator liner 400 away from the refrigerator door.

[0042] Specifically, in the embodiment, the refrigerator liner 400 is a commonly used setting component of the refrigerator. The refrigerator liner 400 plays a role in reducing the conduction of internal and external heat. The refrigerator liner 400 is usually arranged on the inner wall of the refrigerating chamber 100 and the freezing chamber 200, and the air duct assembly 300 is arranged on the side of the refrigerator liner 400 away from the refrigerator door, thereby avoiding the conduction of excess heat in the air duct assembly 300 to the refrigerating chamber 100 and the freezing chamber 200.

[0043] Further, in some embodiments, the system further comprises: An evaporator 500 is arranged on the side of the refrigerator liner 400 away from the refrigerator door. The evaporator 500 is configured to provide low-temperature gas for the refrigerating chamber 100 and the freezing chamber 200 when the refrigerator is in the refrigeration mode. An electric heater 600 is arranged on the evaporator 500. The electric heater 600 is configured to provide heat for the evaporator 500 when the refrigerator is in the defrosting mode.

[0044] Specifically, in the embodiment, the evaporator 500 and the electric heater 600 are commonly used components of the refrigerator. The evaporator 500 provides low-temperature air for the internal compartments of the refrigerator, and the electric heater 600 removes frost on the evaporator 500 caused by refrigeration.

[0045] Further, in some embodiments, the air duct assembly 300 further comprises: a rear duct 320 disposed at a side of the freezing chamber 200 away from the refrigerator door; a top duct 330 disposed at a top of the freezing chamber 200, the top duct 330 being connected with the rear duct 320, the top duct 330 being in communication with the refrigerating chamber 100 and the freezing chamber 200 respectively, the electric damper 310 being disposed at a connection between the rear duct 320 and the top duct 330.

[0046] Specifically, in the embodiment, the main structure of the duct assembly 300 includes the rear duct 320 and the top duct 330, the rear duct 320 being disposed at a side of the freezing chamber 200 away from the refrigerator door, the top duct 330 being disposed at a top of the freezing chamber 200.

[0047] The top duct 330 is in communication with the refrigerating chamber 100 and the freezing chamber 200 respectively, and the rear duct 320 is in communication with the top duct 330 and the evaporator 500 only, i.e. the rear duct 320 is not directly connected with any chamber.

[0048] The electric damper 310 is disposed at the connection between the rear duct 320 and the top duct 330, so as to isolate the rear duct 320 from the refrigerating chamber 100 and the freezing chamber 200 when the refrigerator is in the defrosting mode.

[0049] Further, in some embodiments, the duct assembly 300 further includes: a cold storage module 340 disposed in the top duct 330, the cold storage module 340 being configured to: store refrigeration capacity when the refrigerator is in the refrigeration mode; release the stored refrigeration capacity when the refrigerator is in the defrosting mode.

[0050] Specifically, in the embodiment, the cold storage module 340 is disposed in the duct assembly 300, and is used to store refrigeration capacity, so as to store refrigeration capacity through the cold storage module 340 when the refrigerator is in the refrigeration mode, release the previously stored refrigeration capacity through the cold storage module 340 when the refrigerator is in the defrosting mode, and maintain the cold supply of the refrigerating chamber 100 and the freezing chamber 200 in the defrosting mode, so as to achieve constant temperature inside the chambers of the refrigerator.

[0051] Further, in some embodiments, the cold storage module 340 has a cavity structure inside and has a plurality of ventilation holes, and the cavity structure of the cold storage module 340 is filled with a cold storage agent.

[0052] Specifically, in the present embodiment, the cold storage module 340 has a cavity structure and a plurality of ventilation holes, is filled with a cold storage agent, and stores refrigeration capacity through the cold storage agent.

[0053] The phase change point interval of the cold storage agent is -10°C to -18°C.

[0054] The cold storage module 340 is preferably a cuboid structure, and the internal space can accommodate 100-500 ml of the cold storage agent.

[0055] Further, in some embodiments, the top air duct 330 comprises: A top base plate 331 is arranged above the freezing chamber 200, and the top base plate 331 is arranged on a side of the refrigerator liner 400 away from the freezing chamber 200. A top cover plate 332 is arranged above the top base plate 331; the cold storage module 340 is connected to a side of the top cover plate 332 close to the top base plate 331, and a bottom of the cold storage module 340 has a predetermined distance from the top base plate 331.

[0056] Specifically, in the present embodiment, the top air duct 330 is composed of the top base plate 331 and the top cover plate 332 that are mutually clamped, wherein the top base plate 331 is arranged on a side of the refrigerator liner 400 away from the freezing chamber 200, and the top cover plate 332 is clamped above the top base plate 331.

[0057] It should be noted that the cold storage module 340 is connected to a side of the top cover plate 332 close to the top base plate 331, that is, the cold storage module 340 is arranged in the upper space in the top air duct 330.

[0058] Further, in some embodiments, the top air duct 330 further comprises: A heat preservation foam 333 is arranged in the space between the top base plate 331 and the cold storage module 340.

[0059] Specifically, in the present embodiment, the heat preservation foam 333 is arranged in the space between the top base plate 331 and the cold storage module 340, so as to further improve the ability of the refrigerator to maintain a constant temperature of the refrigeration chamber 100 and the freezing chamber 200 in the defrosting mode.

[0060] Further, in some embodiments, the top air duct 330 further comprises: The top air inlet 334 is arranged on one side of the top base plate 331, the top air duct 330 is communicated with the back air duct 320 through the top air inlet 334, and the electric air door 310 is arranged on the top air inlet 334; The upper layer air outlet 335 is arranged on the top of the top cover plate 332, and the upper layer air outlet 335 is communicated with the top air duct 330 and the refrigeration chamber 100; The lower layer air outlet 336 is arranged on the bottom of the top base plate 331, and the lower layer air outlet 336 is communicated with the top air duct 330 and the freezing chamber 200; The front side air outlet 337 is arranged on the side of the top base plate 331 away from the top air inlet 334, and the front side air outlet 337 is communicated with the top air duct 330 and the freezing chamber 200; The back air duct 320 is provided with a refrigeration return air inlet 321 connected with the return air ducts of the refrigeration chamber 100 and the freezing chamber 200.

[0061] Specifically, in the embodiment, the top air duct 330 has a plurality of ports for air inlet and air outlet, so as to provide stable refrigeration for the refrigeration chamber 100 and the freezing chamber 200.

[0062] Among them, the back air duct 320 is provided with a refrigeration return air inlet 321, so as to recycle the air after the refrigeration chamber 100 and the freezing chamber 200 complete heat exchange, so as to realize closed loop refrigeration.

[0063] The implementation process of the constant-temperature freezing refrigerator control system provided in the embodiment is as follows: In the start-up stage, the fan and the air door are controlled to be closed by the controller, at this time, the compressor and the evaporator are opened, the cold air around the evaporator is mixed with the residual hot air in the air duct quickly, and the cold and hot replacement in the back air duct is completed, and the hot air will not be sent into the top air duct and then enter the compartment.

[0064] In the refrigeration mode, when the evaporator temperature is lower than the compartment temperature by 3℃, the fan and the air door are controlled to be opened by the controller, at this time, the back cold air is circulated in the back air duct by the fan, enters the freezing chamber through the air door of the top air duct, and returns to the back air duct through the bottom return air inlet after circulating in the compartment.

[0065] In defrosting mode, the fan and damper are controlled to be closed by the controller, and the electric heater is turned on to defrost the evaporator. The hot air rises in the back air duct and circulates because the damper is closed and cannot enter the top air duct. When the evaporator temperature reaches the set temperature, which is recommended to be 8-12℃, defrosting is complete, and the controller controls the compressor and evaporator to be turned on.

[0066] The present embodiment has the following advantages: By automatically closing the electric damper in defrosting mode, the hot air is isolated from entering the refrigeration and freezing chambers, and the stored refrigeration capacity is released by the cold storage module, significantly reducing temperature fluctuations and ensuring food preservation quality.

[0067] The optimized design of the air duct assembly (including the back air duct and the top air duct) achieves efficient circulation of cold air and reduces energy loss. In refrigeration mode, the cold storage module stores refrigeration capacity; in defrosting mode, the module releases cold capacity, reducing the need for frequent start-stop of the compressor and prolonging the life of the equipment.

[0068] By minimizing the temperature change caused by defrosting, the system avoids moisture loss and nutrient degradation of food materials, especially for high-end food storage that is sensitive to temperature, and improves the practical value of the refrigerator.

[0069] The system intelligently manages the damper and fan through the controller during startup and defrosting, adapts to different operating modes, reduces the impact of external environment (such as humidity) on the performance of the refrigerator, and ensures stable operation.

[0070] The above description has been made in conjunction with specific embodiments for convenience of explanation. However, the above description in some embodiments is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are to better explain the content of the present disclosure, so that those skilled in the art can better use the embodiments.

Claims

1. A constant temperature freezer control system, characterized in that, The system includes: A refrigerator compartment (100) and a freezer compartment (200) are provided in the refrigerator body, with the freezer compartment (200) located below the refrigerator compartment (100); An air duct assembly (300) is provided on the side of the freezer compartment (200) away from the refrigerator door and on the top of the freezer compartment (200). An electric damper (310) is provided at the air outlet of the air duct assembly (300) and the freezer compartment (200). The electric damper (310) starts when the refrigerator is in cooling mode and closes when the refrigerator is in defrosting mode. The refrigerator liner (400) is disposed on the inner wall of the refrigerator compartment (100) and the freezer compartment (200), and the air duct assembly (300) is disposed on the side of the refrigerator liner (400) away from the refrigerator door.

2. The constant temperature freezer control system according to claim 1, characterized in that, The system also includes: An evaporator (500) is disposed on the side of the refrigerator liner (400) away from the refrigerator door, and the evaporator (500) is configured to provide low-temperature gas to the refrigerator compartment (100) and the freezer compartment (200) when the refrigerator is in cooling mode; An electric heater (600) is disposed on the evaporator (500) and is configured to provide heat to the evaporator (500) when the refrigerator is in defrost mode.

3. The constant temperature freezer control system according to claim 2, characterized in that, The air duct assembly (300) also includes: A rear air duct (320) is provided on the side of the freezer compartment (200) away from the refrigerator door. A top-mounted air duct (330) is provided at the top of the freezer compartment (200). The top-mounted air duct (330) is connected to the rear air duct (320). The top-mounted air duct (330) is connected to the refrigerator compartment (100) and the freezer compartment (200) respectively. An electric damper (310) is provided at the connection between the rear air duct (320) and the top-mounted air duct (330).

4. The constant temperature freezer control system according to claim 3, characterized in that, The evaporator (500) is connected to the rear air duct (320).

5. A constant temperature freezer control system according to claim 3, characterized in that, The air duct assembly (300) also includes: A cold storage module (340) is disposed in the top air duct (330), and the cold storage module (340) is configured as follows: When the refrigerator is in cooling mode, it stores cooling capacity. When the refrigerator is in defrost mode, it releases the stored cooling capacity.

6. A constant temperature freezer control system according to claim 5, characterized in that, The cold storage module (340) has an internal cavity structure and several ventilation holes, and the cavity structure of the cold storage module (340) is filled with a cold storage agent.

7. A constant temperature freezer control system according to claim 6, characterized in that, The phase change point range of the refrigerant is -10℃ to -18℃.

8. A constant temperature freezer control system according to claim 6, characterized in that, The top-mounted air duct (330) includes: A top-mounted bottom plate (331) is disposed above the freezer compartment (200) and on the side of the refrigerator liner (400) away from the freezer compartment (200); A top cover plate (332) is disposed above the top base plate (331); the cold storage module (340) is connected to the top cover plate (332) on the side near the top base plate (331), and there is a preset distance between the bottom of the cold storage module (340) and the top base plate (331).

9. A constant temperature freezer control system according to claim 8, characterized in that, The top-mounted air duct (330) also includes: Thermal insulation foam (333) is disposed in the space between the top base plate (331) and the cold storage module (340).

10. A constant temperature freezer control system according to claim 8, characterized in that, The top-mounted air duct (330) also includes: A top-mounted air inlet (334) is provided on one side of the top-mounted base plate (331). The top-mounted air duct (330) is connected to the rear air duct (320) through the top-mounted air inlet (334). The electric damper (310) is provided on the top-mounted air inlet (334). The upper air outlet (335) is located on the top of the top cover plate (332) and is connected to the top air duct (330) and the refrigerator compartment (100). The lower air outlet (336) is located at the bottom of the top base plate (331) and is connected to the top air duct (330) and the freezer chamber (200). A front air outlet (337) is located on the side of the top bottom plate (331) away from the top air inlet (334). The front air outlet (337) connects the top air duct (330) and the freezer compartment (200). A refrigeration return air inlet (321) is provided on the rear air duct (320), and the refrigeration return air inlet (321) is connected to the return air duct of the refrigerator compartment (100) and the freezer compartment (200).

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