Air duct structure and refrigeration appliance

Abstract

The utility model relates to a kind of air duct structure and refrigeration appliance, comprising: cabinet, first chamber and second chamber are equipped in cabinet interior, and with the first heat exchange space of first chamber circulation communication, with the second heat exchange space of second chamber circulation communication;Bypass air duct's air inlet end is communicated with the air outlet end of second heat exchange space, air outlet end is communicated with the first chamber;Bypass air door is set on bypass air duct.By introducing bypass air duct and controllable opening bypass air door in cabinet, first chamber can actively obtain the cold support of second heat exchange space in its heat exchanger defrosting stage, avoid the temperature of traditional refrigerator to fluctuate greatly due to heat conduction during defrosting.The air duct structure makes two chambers maintain independent refrigeration at the same time, realize cold sharing under special working condition, which is beneficial to improve the temperature stability of refrigeration system and food storage quality.

Description

Technical Field

[0001] This utility model relates to the field of refrigerator technology, and in particular to an air duct structure and a refrigeration appliance. Background Technology

[0002] A refrigerator typically consists of a door, a cabinet, a control system, a refrigeration system, and various interior components. The refrigeration system comprises components such as an evaporator, condenser, capillary tube, filter, and compressor, achieving cooling through the circulation of refrigerant within these components. Interior components, such as drawers and glass shelves, provide functions for categorizing and storing food and maximizing space utilization. All these parts work together to form the complete and complex operating system of a household refrigerator.

[0003] In dual-system refrigerators, there are typically two independent evaporators, each responsible for cooling different compartments. Because the two evaporators operate independently, two separate defrost heaters are needed during the defrosting process to ensure that the frost layer on each evaporator is fully melted. This prevents heat exchange efficiency from decreasing due to frost buildup and ensures the refrigerator's long-term stable cooling performance. However, the defrosting process inevitably causes a temperature rise in the corresponding compartment, especially noticeable in the refrigerator compartment. This is because the refrigerator compartment often uses an aluminum foil heater as its defrosting heating device, which is usually directly attached to the surface of the refrigerator's inner liner. During defrosting, some of the heat generated by the heater is inevitably transferred to the refrigerator compartment, causing a significant temperature increase in a short period. When the temperature rise is too large or lasts too long, it can easily cause a decrease in the freshness of refrigerated food, or even food spoilage, negatively impacting the user's daily food storage experience. Utility Model Content

[0004] This invention provides an air duct structure and a refrigeration appliance to solve the technical problem of temperature rise in the refrigerator compartment during defrosting of the evaporator in the prior art.

[0005] Firstly, this utility model provides an air duct structure, comprising: The housing has a first chamber and a second chamber inside, as well as a first heat exchange space that is in circulation with the first chamber and a second heat exchange space that is in circulation with the second chamber. A side ventilation duct, wherein one air inlet of the side ventilation duct is connected to the air outlet of the second heat exchange space, and the other air outlet is connected to the first chamber. A side ventilation door is installed on the side ventilation duct.

[0006] Furthermore, the air outlet of the second heat exchange space is provided with a second air inlet communicating with the upper part of the second chamber, and a second air damper provided at the second air inlet. The return air end of the second chamber is provided with a second return air outlet communicating with the lower part of the second chamber.

[0007] Furthermore, a partition layer is provided laterally in the middle of the housing, the first compartment and the first heat exchange space are located above the partition layer, the second compartment and the second heat exchange space are located below the partition layer, and the bypass ventilation duct passes through the partition layer.

[0008] Furthermore, a first door is provided on the front side of the first compartment, a second door is provided on the front side of the second compartment, the first heat exchange space is located inside the back side of the first compartment, and the second heat exchange space is located inside the back side of the second compartment.

[0009] Furthermore, the air outlet of the bypass duct faces the rear area of ​​the first chamber.

[0010] Furthermore, the air outlet of the first heat exchange space is provided with a first air inlet communicating with the upper part of the first chamber, and a first damper is provided at the first air inlet; the air return end of the first heat exchange space is provided with a first air return outlet communicating with the lower part of the first chamber.

[0011] Furthermore, the air duct structure also includes a return air duct, which connects the first room and the second room and is equipped with a return air damper.

[0012] Secondly, this utility model provides a refrigeration appliance, including the aforementioned air duct structure.

[0013] The refrigeration appliance includes: a first evaporator and a heater disposed in the first heat exchange space, and a second evaporator disposed in the second heat exchange space.

[0014] Preferably, the refrigeration appliance is a refrigerator.

[0015] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art: The method provided in this embodiment of the invention, by introducing a bypass ventilation duct and a controllable bypass ventilation door into the cabinet, allows the first compartment to actively obtain cooling support from the second heat exchange space during the defrosting stage of its heat exchanger, avoiding significant temperature fluctuations caused by heat conduction during defrosting in traditional refrigerators. This air duct structure enables the two compartments to share cooling capacity under special operating conditions while maintaining independent cooling, which is beneficial for improving the temperature stability of the refrigeration system and the quality of food storage. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a schematic diagram of the structure in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the airflow direction during defrosting in the first compartment in this embodiment of the present invention; Figure 3 This is a schematic diagram showing the airflow direction when the defrosting ventilation door of the first compartment is opened in an embodiment of this utility model; Figure 4 This is a schematic diagram of the airflow direction during refrigeration in the embodiment of this utility model; Figure 5 This is a control block diagram in an embodiment of the present utility model; Figure 6 This is a schematic diagram of the refrigeration system of the refrigeration appliance in an embodiment of this utility model; Explanation of reference numerals in the attached figures: 1. Box body; 11. First chamber; 12. First heat exchange space; 13. Second chamber; 14. Second heat exchange space; 15. Partition layer; 16. First door; 17. Second door; 21. First air inlet; 22. First return air inlet; 23. Second air inlet; 24. Second return air inlet; 2. Bypass ventilation duct; 3. Bypass ventilation door; 4. First air damper; 5. Second air damper; 61. Refrigerated evaporator; 62. Freezing evaporator; 63. Heater; 64. Condenser; 65. Compressor; 66. Capillary tube; 67. Filter; 68. Solenoid valve; 7. Shelves; 81. First temperature sensor; 82. Second temperature sensor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0022] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0023] Existing technologies generally only consider the defrosting of the evaporator, without considering that the heat generated during defrosting may cause the refrigerator compartment temperature to rise, affecting food storage. To address the technical problem of temperature rise in the refrigerator compartment during evaporator defrosting in existing technologies, this invention provides an air duct structure and refrigeration appliance. By adding an air duct, it directly supplements the refrigerator compartment with cooling capacity, reducing the impact of the evaporator on the refrigerator compartment temperature during defrosting.

[0024] Figure 1 A duct structure provided in this embodiment of the present invention is mainly used in refrigeration appliances such as refrigerators, including: a cabinet 1, a bypass ventilation duct 2, and a bypass ventilation door 3, wherein: The cabinet 1 contains a first compartment 11 and a second compartment 13 for storing different types of food. The cabinet 1 also contains a first heat exchange space 12, which is in continuous circulation with the first compartment 11, and a second heat exchange space 14, which is in continuous circulation with the second compartment 13. The first heat exchange space 12 and the second heat exchange space 14 are respectively used to house corresponding heat exchangers to achieve independent cooling for each compartment. One end of the bypass ventilation duct 2 is connected to the air outlet of the second heat exchange space 14 to obtain the cooling energy generated within the second heat exchange space 14. The other end of the bypass ventilation duct 2 is connected to the first compartment 11, allowing cold air from the second heat exchange space 14 to be introduced into the first compartment 11 under specific operating conditions, thereby providing additional cooling compensation to the first compartment 11. Figure 4 As shown, the bypass ventilation door 3 is installed on the bypass ventilation duct 2 and remains closed in normal cooling mode to maintain the independent operation of the two heat exchange spaces and their corresponding compartments. Figure 2 As shown, when the heat exchanger in the first heat exchange space 12 is in defrosting mode, it generates heat. This heat may cause the temperature of the first compartment 11 to rise through conduction within the inner liner or air circulation, thereby affecting the food preservation effect. To reduce the impact of defrosting heat on the first compartment 11, as follows... Figure 3 As shown, the bypass ventilation door 3 can be opened under this condition to compensate for the temperature rise of the first chamber 11 by introducing cold air from the second heat exchange space 14, so that the first chamber 11 is maintained in a suitable low temperature environment.

[0025] By introducing a bypass ventilation duct 2 and a controllable bypass ventilation door 3 into the cabinet 1, the first compartment 11 can actively obtain cooling support from the second heat exchange space 14 during the defrosting stage, avoiding the large temperature fluctuations caused by heat conduction during defrosting in traditional refrigerators. This air duct structure allows the two compartments to share cooling capacity under special operating conditions while maintaining independent cooling, which is beneficial to improving the temperature stability of the refrigeration system and the quality of food storage.

[0026] In one embodiment, such as Figure 1As shown, the air outlet of the second heat exchange space 14 is provided with a second air inlet 23 communicating with the upper part of the second chamber 13. Specifically, the second air inlet 23 is used to guide the cold air generated by the second heat exchange space 14 to the upper area of ​​the second chamber 13. A second damper 5 is provided at the second air inlet 23, and the airflow entering the second chamber 13 is regulated by opening and closing the second damper 5. The return air end of the second chamber 13 is provided with a second return air inlet 24 communicating with the lower part of the second chamber 13, which is used to guide the return air from the lower area of ​​the second chamber 13 back to the second heat exchange space 14, forming a complete and stable circulating air path. By arranging the second air inlet 23 in the upper part of the second chamber 13 and the second return air inlet 24 in the lower part of the second chamber 13, the cold air evenly covers the entire chamber from top to bottom, which can significantly improve the uniformity of temperature distribution and improve the food preservation effect in different areas. In other embodiments, the second air inlet 23 and the second damper 5 can be dynamically adjusted according to different operating modes of the cabinet 1. For example, during rapid cooling, load changes, or temperature recovery after a compartment door is opened, a higher volume of cold air can be introduced by adjusting the second damper 5 to accelerate the recovery speed of the second compartment 13. Alternatively, when the bypass duct 2 is open, the second damper 5 can be closed and the bypass duct 3 of the bypass duct 2 can be opened to accelerate the temperature recovery speed of the first compartment 11 in order to quickly cool the first compartment 11. By setting an air inlet and a second damper 5 at the air outlet of the second heat exchange space 14, and a return air outlet at the return air end of the second compartment 13, the second compartment 13 can form a more reasonable vertical airflow structure, making the cold air distribution more uniform and the temperature control more precise throughout the compartment, and further improving the stability of the overall refrigeration system.

[0027] In one embodiment, a partition layer 15 is horizontally arranged in the middle of the cabinet 1 to divide the interior of the cabinet 1 into two independent areas, upper and lower. The first compartment 11 and the first heat exchange space 12 are arranged above the partition layer 15, forming an upper cold zone to meet the refrigeration needs of food that is sensitive to high temperatures or storage conditions. The second compartment 13 and the second heat exchange space 14 are arranged below the partition layer 15, forming a lower cold zone to provide a storage environment with stronger cooling or different temperature zones. A bypass ventilation duct 2 is arranged through the partition layer 15, allowing the cold air from the second heat exchange space 14 to cross the partition layer 15 and directly enter the upper first compartment 11, thereby providing auxiliary cooling compensation to the first compartment 11 when the first heat exchange space 12 is in special operating conditions such as defrosting. The through arrangement of the bypass ventilation duct 2 avoids additional modifications to the external structure of the cabinet 1, making the overall structure more compact and the airflow smoother. The partition layer 15 clearly separates the two compartments and their corresponding heat exchange spaces, allowing the upper and lower spaces to operate independently in the normal cooling mode. At the same time, through the through connection of the bypass ventilation duct 2, the cooling capacity between the upper and lower spaces can be shared when cooling capacity adjustment or compensation is required, which helps to improve the cooling flexibility and temperature balance of the whole unit.

[0028] In one embodiment, a first door 16 is provided on the front side of the first compartment 11 for opening or closing the first compartment 11 during daily use, allowing the user to retrieve food from the first compartment 11. A second door 17 is provided on the front side of the second compartment 13, forming an independent opening and closing structure for the second compartment 13. This facilitates separate operation of the two compartments and helps reduce cold loss when opening the door. A first heat exchange space 12 is arranged in the rear side interior region of the first compartment 11. By forming air outlet and return channels on the rear side, cold air is evenly delivered into the first compartment 11 to complete the heat exchange process with the air inside the compartment. A second heat exchange space 14 is arranged in the rear side interior region of the second compartment 13, forming a heat exchange area that is relatively independent but cyclically connected to the second compartment 13. By setting the two heat exchange spaces on the rear side of the corresponding compartments, on the one hand, the effective storage space on the front and left and right sides can be freed up, improving the internal volume utilization rate of the cabinet 1. On the other hand, it is conducive to forming a relatively stable back-blowing or rear-circulating airflow, improving the uniformity of temperature distribution and cooling effect inside the compartment.

[0029] It should be noted that the back side interior area of ​​the first compartment 11 is located inside the cabinet 1. That is, the cabinet 1 is equipped with an inner liner to separate the compartment from the heat exchange space. The heat exchange space is located outside the inner liner, and the compartment is the space surrounded by the inner liner. This structure is a conventional structure of refrigerators and other refrigeration appliances. In addition, the compartment is also equipped with shelves 7, drawers and other components, which are also conventional structures of refrigerators and other refrigeration appliances, and will not be described in detail.

[0030] In one embodiment, the air outlet of the bypass duct 2 is directed towards the back side of the first chamber 11, allowing cold air from the second heat exchange space 14 to enter the first chamber 11 along the back side. Orienting the air outlet towards the back side allows the compensated cooling energy to form a coordinated airflow with the back heat exchange space after entering the first chamber 11, facilitating the rapid establishment of a mainstream of cold air in the back area. Furthermore, back-side airflow promotes the spread of cold air along the interior wall of the chamber, creating a temperature distribution flowing from back to front, resulting in a more uniform and smoother cooling diffusion path throughout the chamber. When the first heat exchange space 12 is defrosting, causing the temperature of the first chamber 11 to rise, the back-side compensated airflow can preferentially offset the heat accumulation in the back area, preventing excessively high back temperatures and overall temperature fluctuations. Establishing a cooling compensation point on the back side also reduces the direct impact of cold air on food, improving the gentleness of temperature control while maintaining the stability of temperature adjustment within the chamber.

[0031] In other embodiments, the air outlet of the bypass duct 2 is located at the bottom of the first chamber 11, which is used to directly send cold air from the second heat exchange space 14 into the lower area of ​​the first chamber 11, making the structure simpler.

[0032] In one embodiment, the air outlet of the first heat exchange space 12 is provided with a first air inlet 21 communicating with the upper part of the first chamber 11, for sending air cooled by the first heat exchange space 12 from the upper region into the first chamber 11. A first damper 4 is provided at the first air inlet 21, and the air volume supplied from the first heat exchange space 12 to the first chamber 11 is adjusted by controlling the opening degree. The first damper 4 can be partially opened, fully opened, or closed in different operating modes, thereby adapting to various operating conditions such as rapid cooling, constant temperature maintenance, or defrosting compensation. The return air end of the first heat exchange space 12 is provided with a first return air inlet 22 communicating with the lower part of the first chamber 11. By providing the first air inlet 21 at the upper part and the first return air inlet 22 at the lower part, a downward flow path of cold air can be formed in the first chamber 11, allowing the cold air to naturally settle and distribute within the chamber, which helps to reduce temperature stratification and improve overall temperature uniformity. The adjustment of the first air damper 4 and the corresponding air outlet layout at the upper and lower positions enable the first chamber 11 to form a stable circulating airflow structure, which can flexibly switch between the normal cooling mode and the defrosting mode to quickly maintain the target temperature.

[0033] In one embodiment, the duct structure further includes a return air duct for establishing an air return channel between the first chamber 11 and the second chamber 13. A return air damper is installed on the return air duct to open and close it. When the bypass duct 2 is open and the second heat exchange space 14 provides cooling compensation to the first chamber 11, the return air damper can be opened simultaneously to form a closed loop in the air circulation and prevent local pressure increases inside the first chamber 11. This creates a stable return path between the first chamber 11 and the second chamber 13, ensuring smooth circulation of the compensated cooling capacity. The location of the return air duct can be adjusted according to the structure of the housing 1. One option is to place the return air duct on the partition layer 15, forming a through channel within the partition layer 15 to make the airflow path between chambers more compact. This arrangement not only facilitates process integration but also avoids occupying effective storage space inside the chambers, making the overall duct structure layout more rational. By setting up return air ducts and corresponding return air dampers, the duct structure achieves more flexible switching and control between bypass compensation, independent cooling, and internal circulation, enabling both compartments to maintain stable temperature and good airflow under various operating conditions.

[0034] In one embodiment, such as Figure 5As shown, it may also include a controller and a first temperature sensor 81. The first temperature sensor 81 is installed in the first compartment 11 to detect the temperature of the first compartment 11. The controller is electrically connected to the first temperature sensor 81, the heater 63, and the bypass ventilation door 3. When the heater 63 is in operation, it generates a conduction signal that is transmitted to the controller, indicating that the first compartment is in defrosting mode. At the same time, the temperature signal detected by the temperature sensor of the first compartment 11 is also transmitted to the controller. When the temperature of the first compartment 11 is greater than the preset compartment temperature threshold, the controller controls the bypass ventilation door 3 to open. When the temperature of the first compartment 11 returns to the temperature value recorded by the heater 63 before it is in operation, the controller controls the bypass ventilation door 3 to close. Or when the heater 63 exits the conduction state, that is, when the first compartment exits the defrosting mode, the controller controls the bypass ventilation door 3 to close and controls the first damper to open so that the first compartment continues to cool. Thus, through simple control logic, the cooling capacity can be compensated by the bypass ventilation duct 2 when the heat exchanger of the first compartment 11 is defrosting.

[0035] In addition, a second temperature sensor 82 can also be installed in the second chamber 13 for the control of its second damper 5. The specific control logic will not be described in detail.

[0036] This utility model also proposes a refrigeration appliance, specifically a refrigerator, including the aforementioned air duct structure, capable of forming a multi-zone refrigeration system within the cabinet 1, consisting of a first compartment 11, a second compartment 13, and corresponding first heat exchange spaces 12 and second heat exchange spaces 14. This refrigeration appliance can flexibly switch between various operating modes such as conventional refrigeration, defrosting compensation, cooling capacity adjustment, and independent temperature control, meeting users' needs for different food storage environments.

[0037] By designing the bypass ventilation duct 2, return air duct, corresponding damper structure, and partition layer 15, the refrigeration unit can compensate for the cooling capacity of the first compartment 11 in a timely manner through the second heat exchange space 14 when the first heat exchange space 12 enters the defrosting state, thus maintaining a stable temperature in the first compartment 11 and reducing the impact of the defrosting process on stored food. Simultaneously, through the combined control of the air inlet, return air outlet, and dampers, the refrigeration unit can create a more reasonable and uniform air circulation path in different compartments, improving overall cooling efficiency and temperature uniformity.

[0038] In one embodiment, the refrigeration appliance includes a first evaporator and a heater 63 within a first heat exchange space 12, used for cooling and defrosting control of the first compartment 11. In normal cooling mode, the first evaporator provides cooling to the first compartment 11. When entering defrosting mode, the heater 63, specifically an aluminum foil heater, is attached to the inner liner of the first compartment 11, located between the first evaporator and the inner liner of the first compartment 11. It heats the first evaporator, melting and smoothly discharging the frost layer adhering to its surface. By simultaneously arranging the evaporator and heater 63 within the first heat exchange space 12, a compact heat exchange and defrosting structure can be achieved, improving heat exchange efficiency and defrosting uniformity.

[0039] A second evaporator is installed in the second heat exchange space 14 to provide independent cooling support for the second compartment 13. The second evaporator operates in a refrigeration circuit independent of the first evaporator, and can work alone or in conjunction with the first evaporator, thereby achieving more flexible temperature zone control and cooling capacity adjustment.

[0040] The compressor 65, capillary tube 66, and other refrigeration components are housed in the compressor compartment at the bottom of the casing 1. The compressor 65 provides a pressure differential for the entire refrigeration cycle, allowing the refrigerant to circulate between the evaporators and condensers 64. The capillary tube 66 is used to throttle the refrigerant and provide an appropriate refrigerant flow rate according to the cooling capacity requirements of different evaporators. Centralizing the compressor 65 and capillary tube 66 at the bottom helps reduce noise, improve stability, and simplify the piping layout of the refrigeration system.

[0041] In one embodiment, referring to the refrigeration system shown in Figure 6, the first evaporator is a refrigeration evaporator 61, and the second evaporator is a freezing evaporator 62. The refrigeration evaporator 61 is disposed inside the first heat exchange space 12 and is used to provide refrigeration capacity to the first compartment 11; the freezing evaporator 62 is disposed inside the second heat exchange space 14 and is used to provide freezing capacity to the second compartment 13. The two together constitute a dual-evaporator refrigeration circuit.

[0042] As shown in Figure 1, the refrigeration evaporator 62, the cold storage evaporator 61, the condenser 64, and the compressor 65 together constitute a closed refrigeration cycle system. The compressor 65 is located in the compressor compartment at the bottom of the housing 1, providing the circulation power for the refrigerant and enabling the refrigerant to flow continuously within the system. The high-temperature, high-pressure refrigerant discharged from the compressor 65 first enters the condenser 64, where it releases heat and liquefies through air cooling. The liquid refrigerant then flows through the filter 67 to filter impurities before flowing to the capillary tube 66 for throttling and pressure reduction.

[0043] After capillary tube 66, the refrigerant enters the distribution area of ​​solenoid valve 68 and flows to the corresponding evaporator according to the current operating mode of the system. When the refrigeration evaporator 61 is in cooling mode, solenoid valve 68 first introduces the throttled refrigerant into the refrigeration evaporator 61, allowing the refrigerant to absorb heat and generate cooling capacity inside the evaporator to cool the first compartment 11. In defrost mode, the refrigeration evaporator 61 is heated by heater 63 to melt the frost layer on the evaporator surface. The refrigerant is then directed to the refrigeration evaporator 62 and finally returns to compressor 65.

[0044] When the system needs to provide cooling capacity to the second compartment 13, the refrigerant is directly guided to the evaporator 62 via the solenoid valve 68, where it completes the heat absorption and evaporation process and delivers the cooling capacity to the circulating air path of the second compartment 13.

[0045] Both the refrigeration evaporator 61 and the freezing evaporator 62 are connected back to the compressor 65 through a return gas pipeline, so that the refrigerant can re-enter the compressor 65 in the form of low-pressure vapor after absorbing heat and evaporating, thus forming a complete refrigerant circulation loop.

[0046] By arranging the refrigeration evaporator 61 and the freezing evaporator 62 in different heat exchange spaces, the refrigeration appliance can simultaneously achieve independent cooling of the refrigeration and freezing zones, enabling multiple working modes where the refrigeration and freezing zones work simultaneously or individually. Furthermore, through combination with components such as the solenoid valve 68, capillary tube 66, and compressor 65, the dual evaporator system has greater flexibility and reliability in terms of temperature control, energy efficiency, and defrosting performance.

[0047] In one embodiment, the refrigeration appliance is a refrigerator. By integrating the aforementioned air duct structure and dual-evaporator refrigeration system into the refrigerator body 1, the refrigerator can achieve independent temperature control, cooling capacity compensation, and stable temperature control during defrosting between the refrigeration and freezing compartments. While each compartment inside the refrigerator has independent cooling capacity, it can also coordinate cooling capacity under special operating conditions through the bypass ventilation duct 2 and the return air duct, thereby effectively improving overall freshness preservation performance, energy efficiency, and user experience.

[0048] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0049] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0050] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A duct structure, characterized in that, include: The housing has a first chamber and a second chamber inside, as well as a first heat exchange space that is in circulation with the first chamber and a second heat exchange space that is in circulation with the second chamber. A side ventilation duct, wherein one air inlet of the side ventilation duct is connected to the air outlet of the second heat exchange space, and the other air outlet is connected to the first chamber. A side ventilation door is installed on the side ventilation duct.

2. The air duct structure as described in claim 1, characterized in that, The second heat exchange space has a second air inlet at the air outlet end that communicates with the upper part of the second chamber, and a second air damper at the second air inlet. The second chamber has a second return air outlet at the air return end that communicates with the lower part of the second chamber.

3. The air duct structure as described in claim 1, characterized in that, A partition layer is horizontally arranged in the middle of the box body. The first chamber and the first heat exchange space are located above the partition layer, and the second chamber and the second heat exchange space are located below the partition layer. The bypass ventilation duct passes through the partition layer.

4. The air duct structure as described in claim 1, characterized in that, A first door is provided on the front side of the first compartment, a second door is provided on the front side of the second compartment, the first heat exchange space is located inside the back side of the first compartment, and the second heat exchange space is located inside the back side of the second compartment.

5. The air duct structure as described in claim 4, characterized in that, The air outlet of the bypass duct faces the rear area of ​​the first room.

6. The air duct structure as described in claim 1, characterized in that, The first heat exchange space has an air outlet at its air outlet end that communicates with the upper part of the first chamber, and a first air damper at the air outlet. The first heat exchange space has a return air outlet at its air return end that communicates with the lower part of the first chamber.

7. The air duct structure as described in claim 1, characterized in that, It also includes a return air duct, which connects the first room and the second room and is equipped with a return air damper.

8. A refrigeration appliance, characterized in that, include: The air duct structure as described in any one of claims 1 to 7.

9. The refrigeration appliance as described in claim 8, characterized in that, include: A first evaporator and a heater are disposed in the first heat exchange space, and a second evaporator is disposed in the second heat exchange space.

10. The refrigeration appliance as described in claim 8, characterized in that, The refrigeration appliance is a refrigerator.

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