Refrigeration and freezing device

Abstract

A refrigeration and freezing device (10), comprising a housing (20), a storage compartment and an air mixing fan (31). When the storage compartment requires mixed air refrigeration, the air mixing fan (31) draws in air from both a first air inlet and a second air inlet, and thoroughly mixes cold air in an air supply duct (21) with air inside the storage compartment and then blows same back into the storage compartment, such that the temperature of the airflow entering the storage compartment is moderated, achieving gradual cooling of food ingredients inside the storage compartment.

Description

Refrigeration and freezing equipment

[0001] This application is based on the Chinese patent application with application number 202311029757.9 and application date of August 15, 2023, and claims the priority of the Chinese patent application. The entire content of the above patent application is hereby introduced into this application as a reference. Technical Field

[0002] The present application relates to the field of household appliances, and in particular to a refrigeration and freezing device. Background Art

[0003] With the development of technology and the improvement of living standards, users' requirements for refrigerators are no longer simply to store food, but further require refrigerators to be able to store food better and reduce the loss of food freshness as much as possible.

[0004] Traditional refrigerators are typically direct-cooling refrigerators, which suffer from significant uneven cooling, particularly in the freezer compartment. Air-cooled refrigerators largely overcome this problem compared to direct-cooling refrigerators. However, because existing air-cooled refrigerators control compartment temperature by opening and closing air ducts, the problem of newly added food losing freshness during the cooling process due to the large temperature difference between the inside and outside of the compartment still exists. In other words, existing refrigerators have a single cooling mode and cannot provide a smooth cooling environment for food.

[0005] The reference to any prior art in the specification is not an acknowledgement or suggestion that the prior art forms part of the common general knowledge in any jurisdiction, or that it could reasonably be expected that the person skilled in the art would understand, consider relevant and / or combine with other prior art. Summary of the Invention

[0006] The purpose of this application is to provide a refrigeration and freezing device with multiple working modes and capable of gradually cooling down.

[0007] A further object of the present invention is to improve the structural layout of the storage cavity.

[0008] Another further object of the present invention is to further improve the gentle cooling effect of the refrigeration and freezing device.

[0009] To achieve one of the aforementioned objectives, one embodiment of the present invention provides a refrigerator-freezer comprising a cabinet, a storage cavity, and a mixed air blower. The cabinet is formed with a supply air duct for providing cooling; the storage cavity is disposed within the cabinet and defines a storage compartment; the mixed air blower is disposed within a wall of the storage cavity; the mixed air blower has a first air inlet and a second air inlet, wherein the first air inlet communicates with the storage compartment and the second air inlet communicates with the supply air duct. The mixed air blower is configured to draw air from the first air inlet and / or the second air inlet and induce an airflow toward the storage compartment.

[0010] As a further improvement of the embodiment of the present application, the air supply duct is formed on the rear side of the box body; the air mixing fan is arranged inside the top wall of the storage cavity and is located near the rear side of the storage compartment.

[0011] As a further improvement of the embodiment of the present application, the air mixing fan is a double-suction centrifugal fan, and its rotating shaft is arranged perpendicular to the lower surface of the top wall of the storage cavity.

[0012] As a further improvement of the implementation mode of the present application, the first air inlet is located on the lower side of the mixing fan and is abutted against the lower surface of the top wall of the storage cavity; and a through hole is provided on the lower surface of the top wall of the storage cavity, which is positioned opposite the first air inlet; the second air inlet is located on the upper side of the mixing fan; and a connecting air duct is formed above the second air inlet, extending backward and connecting to the air supply duct.

[0013] As a further improvement to the embodiment of the present application, a mixing air duct is formed inside the top wall of the storage cavity, and the mixing air duct connects the air outlet of the mixing air fan and the storage compartment; and the refrigeration and freezing device also includes: a drawer, which is arranged in the storage cavity; the side walls of the drawer divide the storage compartment into an inner circulation space located inside the drawer and an outer circulation space located outside the drawer; the first air inlet is connected to the inner circulation space; and an inner circulation air outlet and an outer circulation air outlet are provided on the top wall of the storage cavity to connect the mixing air duct to the storage compartment, wherein the inner circulation air outlet is connected to the inner circulation space, and the outer circulation air outlet is connected to the outer circulation space.

[0014] As a further improvement to the embodiment of the present application, the storage cavity further includes a door. The door is disposed at the front end of the storage cavity and is used to open and close the storage compartment. Gaps are respectively formed between the rear side wall and the two lateral walls of the drawer and the corresponding side walls of the storage cavity, and between the front side wall of the drawer and the door. The gaps are connected along the lateral periphery of the drawer to form an external circulation space.

[0015] As a further improvement of the embodiment of the present application, a return air outlet is also provided on the rear side of the storage cavity for circulating and discharging the air in the storage room; and the external circulation air outlet is located above the gap between the front side wall of the drawer and the door body.

[0016] As a further improvement to the embodiment of the present application, the refrigerator-freezer further includes a first temperature sensor, a second temperature sensor, and a heating device. The first temperature sensor is disposed within the bottom wall of the storage cavity and in contact with the bottom wall of the drawer to obtain a first detection temperature; the second temperature sensor is disposed within the mixing duct and near the internal circulation air outlet to obtain a second detection temperature; and the heating device is disposed in front of the air outlet of the mixing fan to heat the airflow blown out by the mixing fan.

[0017] As a further improvement of the embodiment of the present application, the heating device is configured to: start when the difference between the first detected temperature and the second detected temperature is greater than a first threshold value; turn off when the difference between the first detected temperature and the second detected temperature is less than a second threshold value; the first threshold value is greater than the second threshold value.

[0018] As a further improvement to the embodiment of the present application, the heating device is further configured such that the heating power decreases as the difference between the first detected temperature and the second detected temperature decreases.

[0019] Compared to the prior art, the present invention has the following advantages: the refrigeration and freezing device of the present invention disposes a mixed air fan within the wall of the storage cavity, connects the first air inlet of the mixed air fan to the storage compartment, and connects the second air inlet to the supply air duct. When the storage compartment requires mixed air cooling, the mixed air fan simultaneously draws air from the first and second air inlets, fully mixes the cold air in the supply air duct with the air in the storage compartment, and then blows it back into the storage compartment. This moderates the temperature of the airflow entering the storage compartment and achieves a gentle cooling of the food in the storage compartment. Furthermore, the mixed air fan can draw air only from the second air inlet and directly blow the cold air in the supply air duct into the storage compartment. Alternatively, the mixed air fan can draw air only from the first air inlet and blow it back into the storage compartment, thereby circulating the air inside the storage compartment.

[0020] The present invention also reduces the space occupied by the air mixing fan and its matching structure by rationally arranging the storage cavity, making the structural layout more reasonable.

[0021] The present invention also utilizes drawers to form a specific air path, and combines a temperature sensor and a heating device to accurately control the temperature of the mixed airflow, thereby further improving the smooth cooling effect of the refrigeration and freezing device.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention.

[0023] As used herein, the term "comprise" and variations of the term, such as "comprises," "comprised," "comprising," "including," and "containing" do not exclude other features, components, elements, or steps unless the context clearly requires otherwise. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of a refrigeration and freezing device according to a specific embodiment of the present application;

[0025] FIG2 is a schematic partial cross-sectional view of a refrigerator-freezer according to a specific embodiment of the present application;

[0026] FIG3 is a schematic partial perspective view of a refrigerator-freezer according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0028] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art may adjust them as needed to suit specific applications.

[0029] Secondly, it should be noted that in the description of this application, terms such as "inside", "outside", "up", "down", "front", and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0030] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example disclosed herein. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0031] FIG1 is a schematic diagram of a refrigerator-freezer 10 according to one embodiment of the present invention; FIG2 is a schematic partial cross-sectional view of the refrigerator-freezer 10 according to one embodiment of the present invention. FIG2 shows a schematic longitudinal cross-sectional view of a housing 20 along the front-to-back direction, and solid arrows indicate a portion of the airflow direction. FIG2 also illustrates the front-to-back direction of the housing 20. It will be understood that, generally, the opening direction of the storage compartment within the housing 20 faces the front side of the housing 20. For refrigerator-freezer 10 equipped with a drawer 40, the front side of the housing 20 is also the front side of the drawer 40 in the direction of withdrawal.

[0032] 2 , the refrigerator-freezer 10 of the present invention generally includes a housing 20, a storage cavity 30, and an air mixing fan 31. An air supply duct 21 for providing cooling is formed within the housing 20. The storage cavity 30 is disposed within the housing 20 and defines a storage compartment. The air mixing fan 31 is disposed within the wall of the storage cavity 30. The air mixing fan 31 has a first air inlet and a second air inlet, wherein the first air inlet communicates with the storage compartment and the second air inlet communicates with the air supply duct 21. The air mixing fan 31 is configured to draw air from the first air inlet and / or the second air inlet and form an air flow toward the storage compartment.

[0033] As can be seen from the refrigerator-freezer 10 shown in FIG1 , the housing 20 can include multiple independent storage cavities 30, and multiple storage cavities 30 can be arranged horizontally within the housing 20. It is understood that the refrigerator-freezer 10 of the present invention can have any compartment layout, which is not limited herein.

[0034] In the embodiment shown in FIG2 , a drawer 40 is provided within the storage cavity 30, and the air mixing fan 31 is disposed within the top wall of the storage cavity 30, such that the first air inlet faces the interior of the drawer 40. It will be appreciated that in some alternative embodiments, the drawer 40 may not be provided within the storage cavity 30, and the air mixing fan 31 may be disposed within other walls of the storage cavity 30, such as the rear sidewall. In embodiments where the air mixing fan 31 is disposed within the rear sidewall, the top wall of the storage cavity 30 can be made relatively thinner.

[0035] By adjusting the opening and closing of the air inlet of the air mixing fan 31, the refrigerator-freezer 10 can have at least three operating modes.

[0036] Referring to the airflow direction indicated by solid arrows in Figure 2 , in the first operating mode, the mixing fan 31 simultaneously draws air from the storage compartment and the supply duct 21 through the first and second air inlets. This mixes the cold air, carrying a large amount of cooling capacity, with the warmer air within the compartment before blowing it into the storage compartment. The temperature of the mixed air entering the storage compartment is between the temperature of the air within the compartment and the temperature of the cold air drawn in from the supply duct 21. This moderates the temperature of the air entering the storage compartment and prevents direct blowing of cold air, which is too cold relative to the food, into the storage compartment. A return air vent 39 is generally provided on the storage cavity 30 and communicates with the return air duct 22 within the cabinet 20, allowing some of the relatively warm air within the storage compartment to be discharged. The air within the storage compartment continuously circulates. As cooling continues, the temperature of the mixed air and the air within the storage compartment gradually decreases and approaches the preset compartment temperature, thereby achieving a gentle cooling function.

[0037] Since the user inevitably loses cooling energy within the storage compartment when the storage compartment is opened and the refrigerator-freezer 10 begins cooling, the temperature inside the storage compartment will clearly be higher than the compartment's preset temperature, while the temperature of the food will be even higher. If the food is directly blown by cold air, which is much lower than its own temperature, while its surface may be evenly cooled, the cold energy will not be able to be transferred to the food's interior in a timely manner, resulting in uneven cooling of the food inside and outside. The refrigerator-freezer 10 of the present invention mixes the air inside the storage compartment with the cold air before blowing it into the storage compartment. This ensures that the temperature of the mixed air entering the storage compartment is between the temperature of the cold air and the temperature of the storage compartment, allowing the food sufficient time to transfer the cold energy to the interior while cooling the food. As the temperature of the food and the storage compartment gradually decreases, the temperature of the mixed air also gradually decreases and approaches the preset temperature of the compartment, thereby preserving the freshness of the food as much as possible in a gentle cooling environment.

[0038] In addition to the first working mode in which the air mixing fan 31 simultaneously draws air from the first air inlet and the second air inlet, the refrigerator-freezer 10 can also control the air mixing fan 31 to draw air only from the first air inlet or the second air inlet.

[0039] In the second operating mode, in which the mixing fan 31 draws air only from the second air inlet, the mixing fan 31 blows the cold air in the air supply duct 21 directly into the storage compartment. The second operating mode can generally be used in a conventional cooling mode after the temperature of the storage compartment drops to a predetermined temperature of the compartment, or in other operating modes such as a quick freezing mode.

[0040] In the third working mode in which the air mixing fan 31 only draws air from the first air inlet, the air mixing fan 31 draws air into the storage room and blows it back into the storage room. The air in the storage room will only circulate internally without introducing cold air into the air supply duct 21, thereby making the air temperature and humidity in the storage room uniform.

[0041] The above functions can be achieved by setting air dampers at the first air inlet and the second air inlet, and the specific setting method of the air dampers will not be repeated here.

[0042] In some optional embodiments, the air supply duct 21 is formed on the rear side of the box body 20; the air mixing fan 31 is arranged inside the top wall of the storage cavity 30 and is located near the rear side of the storage compartment.

[0043] In most embodiments of the present invention, a flat-shaped mixed air fan 31 that takes in air from two opposite sides is usually selected. For example, in some preferred embodiments, the mixed air fan 31 is a double-suction centrifugal fan, and its rotating shaft is arranged perpendicular to the lower surface of the top wall of the storage cavity. In order to reduce the impact of the mixed air fan 31 on the air duct, thermal insulation structure, etc. of the box body 20, it is usually preferred to arrange the mixed air fan 31 inside the top wall of the storage cavity 30 and at a position close to the rear side of the storage compartment. When the air supply duct 21 is formed at the rear side of the box body 20, the connecting duct 24 between the mixed air fan 31 and the air supply duct 21 located near the rear side of the storage compartment can be arranged shorter. In some other optional embodiments, the air supply duct 21 may be located on one or both lateral sides of the box body 20 instead of the rear side, and the mixed air fan 31 can be arranged close to one side of the air supply duct 21 according to actual needs.

[0044] Although the positions of the first air inlet and the second air inlet are not clearly marked in Figure 2, it can be seen from the setting position of the mixing fan 31 that, in the embodiment shown in Figure 2, the first air inlet is located on the lower side of the mixing fan 31, and the second air inlet is located on the upper side of the mixing fan 31.

[0045] In some optional embodiments, the first air inlet is located on the lower side of the mixing fan 31 and is abutted against the lower surface of the top wall of the storage cavity 30; and a through hole is provided on the lower surface of the top wall of the storage cavity 30, which is positioned opposite the first air inlet; the second air inlet is located on the upper side of the mixing fan 31; and a connecting air duct 24 is formed above the second air inlet, extending backward and connecting to the air supply duct 21.

[0046] As shown in reference Figure 2, the first air inlet of the mixing fan 31 is directly opposite to and close to the opening on the lower surface of the top wall of the storage cavity 30, which can minimize the thickness occupied by the mixing fan 31 in the top wall of the storage cavity 30. At the same time, the connecting air duct 24 above the second air inlet extends backward in a flat shape instead of extending upward, which further reduces the thickness occupied by the connecting air duct 24 and the mixing fan 31 in the top wall of the storage cavity 30, thereby making the internal layout of the top wall of the storage cavity 30 more reasonable.

[0047] Figure 3 is a schematic partial perspective view of a refrigerator-freezer 10 according to an embodiment of the present invention. Figure 3 specifically shows the mixing air duct 32 inside the top plate of the storage cavity 30, and indicates the position of the side wall of the drawer 40 with a dotted frame. At the same time, the airflow direction in the mixing air duct 32 is indicated by solid arrows and solid lines, and the airflow direction in the external circulation space 45 is indicated by solid arrows and dotted lines (indicating that the external circulation space 45 is on the lower side of the top wall of the storage cavity 30).

[0048] In some optional embodiments, a mixing air duct 32 is formed inside the top wall of the storage cavity 30, and the mixing air duct 32 connects the air outlet of the mixing air fan 31 and the storage compartment; and the refrigerator-freezer 10 also includes: a drawer 40, which is arranged in the storage cavity 30; the side wall of the drawer 40 divides the storage compartment into an inner circulation space 44 located on the inner side of the drawer 40 and an outer circulation space 45 located on the outer side of the drawer 40; the first air inlet is connected to the inner circulation space 44; and an inner circulation air outlet 34 and an outer circulation air outlet 35 are provided on the top wall of the storage cavity 30 to connect the mixing air duct 32 to the storage compartment, wherein the inner circulation air outlet 34 is connected to the inner circulation space 44, and the outer circulation air outlet 35 is connected to the outer circulation space 45.

[0049] As can be seen in Figure 3, the internal circulation air outlet 34 is located above the internal circulation space 44 inside the drawer 40, while the external circulation air outlet 35 is located above the external circulation space 45 between the drawer 40 and the storage cavity 30. Part of the airflow blown out by the air mixing fan 31 is blown into the internal circulation space 44 through the internal circulation air outlet 34, and part of the airflow is blown into the external circulation space 45 through the external circulation air outlet 35. The top of the side wall of the drawer 40 is close to the top wall of the storage cavity 30, thereby reducing or even isolating the airflow exchange between the internal circulation space 44 and the external circulation space 45.

[0050] The first air inlet of the air mixing fan 31 is connected to the internal circulation space 44, thereby forming an airflow loop in the internal circulation space 44. The air mixing fan 31 continuously draws air from the internal circulation space 44. At the same time, part of the mixed airflow is blown into the internal circulation space 44 in the drawer 40 through the internal circulation air outlet 34 to replenish the air, thereby lowering the temperature of the internal circulation space 44 and providing cooling for the food. The other part of the mixed airflow is blown into the external circulation space 45 between the drawer 40 and the storage cavity 30 through the external circulation air outlet 35, providing cooling to the drawer 40 from the outside, and is discharged through the return air outlet 39 of the storage cavity 30.

[0051] The internal circulation air outlet 34 and the first air inlet are usually set at a large distance from each other. For example, in some optional embodiments, the first air inlet is close to the back side of the drawer 40, and the internal circulation air outlet 34 is close to the front side of the drawer 40. The mixed air flow blown into the internal circulation space 44 circulates from front to back.

[0052] In some optional embodiments, the storage cavity 30 further includes a door 33. The door 33 is disposed at the front end of the storage cavity 30 and is used to open and close the storage compartment. A gap is formed between the rear side wall and the two lateral side walls of the drawer 40 and the corresponding side walls of the storage cavity 30, and a gap is formed between the front side wall of the drawer 40 and the door 33. The gap is connected to the lateral side of the drawer 40 to form an external circulation space 45.

[0053] The lateral periphery of the drawer 40 refers to the periphery corresponding to the four side walls of the drawer 40. In the above-described embodiment, the upper front portion of the external circulation space 45 is connected to the mixed air duct 32 via the external circulation air outlet 35, and the lower rear portion is connected to the return air duct 22 via the return air outlet 39, thereby allowing the mixed airflow to provide cooling to the interior of the drawer 40 as it flows through the side walls of the drawer 40. In particular, in some optional embodiments, a gap is also provided between the bottom wall of the drawer 40 and the bottom wall of the storage cavity 30, and is connected to the gap in the side wall, so that the mixed airflow can also flow through the bottom wall of the drawer 40 and provide cooling to the interior of the drawer 40. The gap in the bottom wall of the drawer 40 is typically connected to other gaps in the front-to-back direction, so that the mixed airflow flows from front to back through the bottom wall of the drawer 40.

[0054] Depending on the type of refrigerator-freezer 10, the door body 33 of the storage cavity 30 may include a variety of different settings, such as being pivotally arranged on the storage cavity 30 and rotating to open and close, or being fixedly connected to the drawer 40 and opening and closing synchronously with the pulling or pushing back of the drawer 40, etc., which are not limited here. Each of the above-mentioned door bodies 33 can form a gap between the front side wall of the drawer 40.

[0055] In a preferred embodiment of the present invention, a return air vent 39 is further provided on the rear side of the storage cavity 30 for circulating and exhausting air from the storage compartment. Furthermore, an external circulation air outlet 35 is located above the gap between the front sidewall of the drawer and the door 33. To ensure uniform airflow on both sides of the drawer 40 within the external circulation space 45, it is generally preferred to position the return air vent 39 and the external circulation air outlet 35 apart from each other. Specifically, the return air vent 39 is located on the rear side of the storage cavity 30, while the external circulation air outlet 35 is positioned closer to the door 33.

[0056] In some optional embodiments, the internal circulation air outlet 34 includes a plurality of internal circulation ventilation holes evenly distributed in the width direction of the mixing air duct 32; and / or the external circulation air outlet 35 includes a plurality of external circulation ventilation holes evenly distributed in the width direction of the mixing air duct 32.

[0057] As shown in FIG3 , the mixing air duct 32 formed within the top wall of the storage cavity 30 is generally shaped to gradually widen from the air outlet end of the mixing air fan 31. The internal circulation air outlet 34 and the external circulation air outlet 35 are also arranged along the width of the mixing air duct 32. As shown in the embodiment of FIG3 , the internal circulation air outlet 34 and the external circulation air outlet 35 can be arranged to include a plurality of internal circulation vents and external circulation vents, and evenly arranged along the width of the mixing air duct 32. In some other optional embodiments, the internal circulation air outlet 34 and the external circulation air outlet 35 can also be arranged in a strip shape and extend along the width of the mixing air duct 32.

[0058] In some optional embodiments, the refrigerator-freezer 10 further includes a first temperature sensor 37, a second temperature sensor 38, and a heating device 36. The first temperature sensor 37 is disposed within the bottom wall of the storage cavity 30 and abuts against the bottom wall of the drawer 40 to obtain a first detection temperature. The second temperature sensor 38 is disposed within the mixing duct 32 and near the internal circulation air outlet 34 to obtain a second detection temperature. The heating device 36 is disposed in front of the air outlet of the mixing fan 31 to heat the airflow blown out by the mixing fan 31.

[0059] The first detected temperature generally reflects the temperature of the food stored in the drawer 40 or the temperature within the inner circulation space 44, while the second detected temperature directly reflects the temperature of the airflow blown into the inner circulation space 44 and the outer circulation space 45. Based on the detected temperatures, the airflow temperature can be further adjusted by the heating device 36 to prevent it from being too cold relative to the food.

[0060] In particular, in some optional embodiments, the first temperature sensor 37 is arranged near the rear side wall of the drawer 40, or is located at the projection of the first air inlet of the mixing fan 31 on the horizontal plane where the bottom wall of the storage cavity 30 is located, so that the first temperature sensor 37 can reflect the air temperature at the rear of the internal circulation space 44 or the intake air temperature of the first air inlet.

[0061] On this basis, the heating device 36 is configured to: start when the difference between the first detected temperature and the second detected temperature is greater than the first threshold; shut down when the difference between the first detected temperature and the second detected temperature is less than the second threshold; the first threshold is greater than the second threshold.

[0062] Considering that food is typically close to room temperature when first stored in a storage compartment, even when mixed with the air from the storage compartment, there is still a significant temperature difference between the food and the food stored in a freezer compartment or even in a colder, deep freezer compartment. Direct cooling may not evenly reduce the temperature of the food inside and outside. Therefore, in the above embodiment, when the difference between the first and second detected temperatures exceeds a first threshold, the heating device 36 is activated to heat the mixed airflow and reduce the temperature difference. Once the temperature difference falls below a second predetermined threshold, the heating device 36 is turned off and normal cooling is resumed.

[0063] The first threshold is usually a larger value, generally between 15°C and 30°C, while the second threshold is usually between 5°C and 15°C. Depending on the preset temperature of the storage compartment, the first threshold and the second threshold can be flexibly adjusted accordingly and are not limited to the above ranges.

[0064] In some optional embodiments, the heating device 36 is further configured to reduce its heating power as the difference between the first detected temperature and the second detected temperature decreases. Obviously, when the temperature difference is lower than the second preset value, the heating power of the heating device 36 is zero, which is equivalent to being turned off.

[0065] By using the refrigeration and freezing device 10 in the above embodiment, even if the user directly puts food at room temperature into the deep freezing chamber with an extremely low temperature, the refrigeration and freezing device 10 can cool the food relatively smoothly, thereby greatly preserving the freshness of the food.

[0066] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A refrigeration and freezing device, comprising: A box body, wherein an air supply duct for providing cooling is formed in the box body; A storage cavity is disposed in the box body and defines a storage compartment; as well as The air mixing fan is arranged in the wall of the storage cavity; the air mixing fan has a first air inlet and a second air inlet, wherein The first air inlet is connected to the storage compartment, the second air inlet is connected to the air supply duct, and the air mixing fan is configured to inhale air from the first air inlet and / or the second air inlet and promote the formation of an airflow blowing toward the storage compartment.

2. The refrigerator-freezer according to claim 1, wherein: The air supply duct is formed on the rear side of the box body; The air mixing fan is arranged inside the top wall of the storage cavity and is located near the rear side of the storage compartment.

3. The refrigerator-freezer according to claim 2, wherein: The air mixing fan is a double-suction centrifugal fan, and its rotating shaft is arranged perpendicular to the lower surface of the top wall of the storage cavity.

4. The refrigerator-freezer according to claim 3, wherein: The first air inlet is located at the lower side of the air mixing fan and is close to the lower surface of the top wall of the storage cavity; and a through hole is formed on the lower surface of the top wall of the storage cavity and is directly opposite to the first air inlet; The second air inlet is located at the upper side of the air mixing fan; and a connecting air duct extending backward and connected to the air supply duct is formed above the second air inlet.

5. The refrigerator-freezer according to claim 2, wherein: A mixing air duct is formed inside the top wall of the storage cavity, and the mixing air duct communicates with the air outlet of the mixing air fan and the storage compartment; and The refrigeration and freezing device also includes: A drawer is arranged in the storage cavity; the side wall of the drawer divides the storage compartment into an inner circulation space located inside the drawer and an outer circulation space located outside the drawer; The first air inlet is in communication with the inner circulation space; and The top wall of the storage cavity is provided with an inner circulation air outlet and an outer circulation air outlet for connecting the mixing air duct to the storage compartment. The inner circulation air outlet is communicated with the inner circulation space, and the outer circulation air outlet is communicated with the outer circulation space.

6. The refrigerator-freezer according to claim 5, wherein: The storage cavity further comprises: A door body, arranged at the front end of the storage cavity, for opening and closing the storage compartment; There are gaps between the rear side wall and the two lateral side walls of the drawer and the corresponding side walls of the storage cavity, and between the front side wall of the drawer and the door body, and the gaps are connected at the lateral circumference of the drawer to form the external circulation space.

7. The refrigerator-freezer according to claim 6, wherein: The storage cavity is also provided with an air return port at the rear side for circulating and discharging the air in the storage room; and The external circulation air outlet is located above the gap between the front side wall of the drawer and the door body.

8. The refrigerator-freezer according to claim 5, further comprising: A first temperature sensor is disposed in the bottom wall of the storage cavity and is attached to the bottom wall of the drawer to obtain a first detection temperature; A second temperature sensor is disposed in the mixing air duct and close to the inner circulation air outlet to obtain a second detection temperature; as well as The heating device is arranged at the front side of the air outlet of the air mixing fan and is used for heating the air flow blown out by the air mixing fan.

9. The refrigerator-freezer according to claim 8, wherein: The heating device is configured as follows: Start when the difference between the first detected temperature and the second detected temperature is greater than a first threshold; When the difference between the first detected temperature and the second detected temperature is less than a second threshold value, the device is turned off; The first threshold is greater than the second threshold.

10. The refrigerator-freezer according to claim 9, wherein: The heating device is also configured to: The heating power decreases as the difference between the first detected temperature and the second detected temperature decreases.

Images