Refrigerating and freezing device

Abstract

The invention provides a refrigerating and freezing device. The refrigerating and freezing device comprises a box body, a storage cavity and an air mixing fan. An air supply duct for providing cooling capacity is formed in the box body; the storage cavity is arranged in the box body, and a storage chamber is defined by the storage cavity; the air mixing fan is arranged in the wall surface of the storage cavity; the air mixing fan is provided with a first air inlet and a second air inlet, the first air inlet is communicated with the storage chamber, the second air inlet is communicated with the air supply duct, and the air mixing fan is configured to suck air from the first air inlet and / or the second air inlet and promote formation of airflow blown to the storage chamber. When air mixing refrigeration is needed in the storage chamber, the air mixing fan sucks air from the first air inlet and the second air inlet at the same time, cold air in the air supply duct and air in the storage chamber are fully mixed and then blown back into the storage chamber, the temperature of airflow entering the storage chamber is relieved, and gentle cooling of food materials in the storage chamber is achieved.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and in particular to a refrigeration and freezing device. Background Art

[0002] 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.

[0003] Traditional refrigerators are usually direct cooling refrigerators, which have obvious refrigeration unevenness problems, and the freshness loss of food stored in the freezer is particularly serious. Compared with direct cooling refrigerators, air-cooled refrigerators have largely overcome the problem of uneven refrigeration, but because existing air-cooled refrigerators control the compartment temperature by opening and closing the air path, there is still a problem that the newly placed food will lose its freshness seriously during the refrigeration process due to the large temperature difference between the inside and outside of the food. In other words, the existing refrigerator refrigeration mode is too single and cannot provide a refrigeration environment for the food to cool down smoothly. Summary of the invention

[0004] Based on the above background, an object of the present invention is to provide a refrigeration and freezing device with multiple working modes and capable of smoothly cooling down.

[0005] A further object of the present invention is to improve the structural layout of the storage cavity.

[0006] Another further object of the present invention is to further improve the gentle cooling effect of the refrigeration and freezing device.

[0007] In particular, the present invention provides a refrigeration and freezing device, comprising a box, a storage cavity and an air mixing fan. An air supply duct for providing cold air is formed in the box; the storage cavity is arranged in the box and defines a storage compartment; the air mixing fan is arranged in a wall surface 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, and 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 air flow blown toward the storage compartment.

[0008] Optionally, 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.

[0009] Optionally, 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.

[0010] Optionally, the first air inlet is located on the lower side of the mixing fan and is close to 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 directly opposite to 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, which extends backward and connects to the air supply duct.

[0011] Optionally, 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 wall of the drawer divides the storage compartment into an inner circulation space located on the inner side of the drawer and an outer circulation space located on the outer side of 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, which 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.

[0012] Optionally, the storage cavity further comprises a door body. The door body is arranged at the front end of the storage cavity and is used to open and close 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 an external circulation space.

[0013] Optionally, 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.

[0014] Optionally, the refrigerator-freezer further comprises a first temperature sensor, a second temperature sensor and a heating device. The first temperature sensor is arranged in the bottom wall of the storage cavity and is in contact with the bottom wall of the drawer to obtain a first detection temperature; the second temperature sensor is arranged in the mixed air duct and is arranged close to the inner circulation air outlet to obtain a second detection temperature; the heating device is arranged in front of the air outlet of the mixed air fan to heat the air flow blown out by the mixed air fan.

[0015] Optionally, 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; shut down when the difference between the first detected temperature and the second detected temperature is less than a second threshold; the first threshold is greater than the second threshold.

[0016] Optionally, 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.

[0017] The refrigeration and freezing device of the present invention sets a mixed air fan in the wall surface of the storage cavity, and makes the first air inlet of the mixed air fan communicate with the storage room, and the second air inlet communicates with the air supply duct. When the storage room needs mixed air cooling, the mixed air fan sucks air from the first air inlet and the second air inlet at the same time, and blows it back into the storage room after fully mixing the cold air in the air supply duct with the air in the storage room, so that the temperature of the air flow entering the storage room is moderated, and the food in the storage room is smoothly cooled. In addition, the mixed air fan can only suck air from the second air inlet, and directly blow the cold air in the air supply duct into the storage room. The mixed air fan can also only suck air from the first air inlet and blow it back to the storage room, so that the air inside the storage room circulates.

[0018] The present invention also reduces the space occupied by the air mixing fan and its matching structure by reasonably arranging the storage cavity, making the structural layout more reasonable.

[0019] 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 gentle cooling effect of the refrigeration and freezing device.

[0020] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0022] Figure 1 is a schematic diagram of a refrigeration and freezing device according to an embodiment of the present invention;

[0023] Figure 2 is a schematic partial cross-sectional view of a refrigeration and freezing device according to an embodiment of the present invention;

[0024] Figure 3 is a schematic partial perspective view of a refrigerator-freezer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] 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.

[0026] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0027] Secondly, it should be noted that in the description of the present 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 should not be understood as a limitation on the present application.

[0028] In the description of this specification, the description with reference to the terms "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 in the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0029] Figure 1 is a schematic diagram of a refrigeration and freezing device 10 according to an embodiment of the present invention; Figure 2 is a schematic partial cross-sectional view of a refrigerator-freezer 10 according to an embodiment of the present invention, Figure 2 2 shows a schematic diagram of a longitudinal section of the box body 20 along the front-to-back direction, and a solid arrow indicates a part of the airflow direction. Figure 2 The front and rear directions of the cabinet 20 are also indicated. It can be understood that, usually, the opening direction of the storage compartment in the cabinet 20 is facing the front side of the cabinet 20. For the refrigerator-freezer 10 provided with a drawer 40, the front side of the cabinet 20 is also the front side of the drawer 40 in the pulling direction.

[0030] refer to Figure 2 As shown, the refrigerator-freezer 10 of the present invention generally includes a box body 20, a storage cavity 30 and an air mixing fan 31. An air supply duct 21 for providing cold air is formed in the box body 20; the storage cavity 30 is arranged in the box body 20 and defines a storage compartment; the air mixing fan 31 is arranged in the wall surface 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 is connected to the storage compartment, and the second air inlet is connected to the air supply duct 21, and the air mixing fan 31 is configured to inhale air from the first air inlet and / or the second air inlet, and promote the formation of an air flow blown toward the storage compartment.

[0031] from Figure 1 As can be seen from the refrigerator-freezer 10 shown, the box 20 may include a plurality of independent storage cavities 30, and a plurality of storage cavities 30 may be arranged transversely in the box 20. It is understood that the refrigerator-freezer 10 of the present invention may be a refrigerator-freezer 10 with any compartment layout, which is not limited here.

[0032] exist Figure 2 In the illustrated embodiment, a drawer 40 is provided in the storage cavity 30, and the air mixing fan 31 is disposed in the top wall of the storage cavity 30, so that the first air inlet faces the inside of the drawer 40. It is understood that in some other optional embodiments, the drawer 40 may not be provided in the storage cavity 30, and the air mixing fan 31 may also be disposed in other wall surfaces of the storage cavity 30, such as the rear side wall. In the embodiment in which the air mixing fan 31 is disposed in the rear side wall, the thickness of the top wall of the storage cavity 30 can be set relatively thinner.

[0033] By adjusting the opening and closing of the air inlet of the air mixing fan 31, the refrigeration and freezing device 10 can have at least three working modes.

[0034] refer to Figure 2 The direction of airflow is indicated by solid arrows. In the first working mode, the air mixing fan 31 simultaneously inhales air from the storage room and the air supply duct 21 through the first air inlet and the second air inlet, so that the cold air carrying a large amount of coldness is mixed with the air with a higher temperature in the room and then blown into the storage room. The temperature of the mixed air flow blown into the storage room is between the air temperature in the storage room and the temperature of the cold air inhaled from the air supply duct 21, so that the temperature of the air flow entering the storage room is moderated, and the cold air with a temperature too low relative to the food is avoided from being directly blown into the storage room. The storage cavity 30 is generally provided with a return air port 39, which is connected to the return air duct 22 in the box 20, so that a part of the relatively high temperature air in the storage room is discharged. The air in the storage room will circulate continuously. As the cooling continues, the temperature of the mixed air flow and the air temperature in the storage room will gradually decrease and approach the preset temperature of the room, thereby realizing a gentle cooling function.

[0035] Since the cold loss in the storage room is inevitable when the user opens the storage room and stores the food, when the storage room is closed again and the refrigeration and freezing device 10 starts to refrigerate, the temperature in the storage room will obviously be higher than the preset temperature of the room, and the temperature of the food is higher than the temperature in the storage room. If the food is directly blown by cold air that is much lower than its own temperature, although its surface may be evenly cooled, the cold is difficult to be transferred to the inside of the food in time, which will also cause uneven cooling inside and outside the food. The refrigeration and freezing device 10 of the present invention makes the temperature of the mixed air flow blown into the storage room between the cold air temperature and the storage room temperature by mixing the air in the storage room with the cold air and then blowing it into the storage room, so that the food has sufficient time to transfer the cold to the inside while refrigerating. As the temperature of the food and the temperature of the storage room gradually decrease, the temperature of the mixed air flow will also gradually decrease and approach the preset temperature of the room, so that the food can retain its freshness as much as possible in a gentle cooling environment.

[0036] 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 refrigeration and freezing device 10 can also control the air mixing fan 31 to draw air only from the first air inlet or the second air inlet.

[0037] In the second working mode in which the air mixing fan 31 only sucks air from the second air inlet, the air mixing fan 31 directly blows the cold air in the air supply duct 21 into the storage room. The second working mode can generally be used in a conventional cooling mode after the temperature of the storage room drops to near the preset temperature of the room, or in other working modes such as a quick freezing mode.

[0038] In the third working mode in which the mixing fan 31 only draws air from the first air inlet, the 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.

[0039] The above functions can be achieved by setting air doors at the first air inlet and the second air inlet, and the specific setting method of the air doors will not be repeated here.

[0040] 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.

[0041] In most embodiments of the present invention, a flat-shaped mixing fan 31 that takes in air from opposite sides is usually selected. For example, in some preferred embodiments, the mixing 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 influence of the mixing fan 31 on the air duct, heat insulation structure, etc. of the box 20, the mixing fan 31 is usually preferably arranged inside the top wall of the storage cavity 30 and located near the rear side of the storage compartment. When the air supply duct 21 is formed on the rear side of the box 20, the connecting duct 24 between the mixing fan 31 and the air supply duct 21 located near the rear side of the storage compartment can be set shorter. In some other optional embodiments, the air supply duct 21 may be located on one or both sides of the lateral side of the box 20 instead of the rear side, and the mixing fan 31 can be arranged close to one side of the air supply duct 21 according to actual needs.

[0042] Although Figure 2 The positions of the first air inlet and the second air inlet are not clearly marked, but it can be seen from the setting position of the air mixing fan 31 that Figure 2 In the illustrated embodiment, the first air inlet is located at the lower side of the air mixing fan 31 , and the second air inlet is located at the upper side of the air mixing fan 31 .

[0043] 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 to 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.

[0044] refer to Figure 2 As shown, 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.

[0045] Figure 3 is a schematic partial perspective view of a refrigerator-freezer 10 according to one embodiment of the present invention, Figure 3 The mixing air duct 32 inside the top plate of the storage cavity 30 is specifically shown, and the position of the side wall of the drawer 40 is indicated by a dotted line frame. 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).

[0046] 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 refrigeration and freezing device 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, which 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.

[0047] from Figure 3 It can be seen that the inner circulation air outlet 34 is located above the inner circulation space 44 inside the drawer 40, and the outer circulation air outlet 35 is located above the outer circulation space 45 between the drawer 40 and the storage cavity 30. A part of the airflow blown out from the air mixing fan 31 is blown into the inner circulation space 44 through the inner circulation air outlet 34, and a part of the airflow is blown into the outer circulation space 45 through the outer 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 inner circulation space 44 and the outer circulation space 45.

[0048] The first air inlet of the air mixing fan 31 is connected to the inner circulation space 44, so that an air flow loop is formed in the inner circulation space 44. The air mixing fan 31 continuously absorbs the air flow in the inner circulation space 44, and at the same time, part of the mixed air flow is blown into the inner circulation space 44 in the drawer 40 through the inner circulation air outlet 34 for replenishment, and is used to reduce the temperature of the inner circulation space 44 and provide cold air for the food. The other part of the mixed air flow is blown into the outer circulation space 45 between the drawer 40 and the storage cavity 30 through the outer circulation air outlet 35, providing cold air to the drawer 40 from the outside, and is discharged from the return air outlet 39 of the storage cavity 30.

[0049] The internal circulation air outlet 34 and the first air inlet are usually arranged far apart. For example, in some optional embodiments, the first air inlet is close to the rear 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.

[0050] 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; there is a gap 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 there is a gap between the front side wall of the drawer 40 and the door 33, and the gap is connected at the lateral peripheral side of the drawer 40 to form an external circulation space. 45.

[0051] The lateral circumference of the drawer 40 refers to the circumference corresponding to the four side walls of the drawer 40. The upper front end of the external circulation space 45 in the above-mentioned embodiment is connected to the mixed air duct 32 via the external circulation air outlet 35, and the lower rear end is connected to the return air duct 22 via the return air outlet 39, so that the mixed airflow provides cooling to the inside of the drawer 40 during the process of flowing through the side walls of the drawer 40. In particular, in some optional embodiments, there is also a gap between the bottom wall of the drawer 40 and the bottom wall of the storage cavity 30, and it is connected to the gap at the side wall, so that the mixed airflow can also flow through the bottom wall of the drawer 40 and provide cooling to the inside of the drawer 40. The gap in the bottom wall of the drawer 40 is usually connected to other gaps in the front-to-back direction, so that the mixed airflow flows through the bottom wall of the drawer 40 from front to back.

[0052] Depending on the refrigeration and freezing device 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 drawer 40 being pulled out or pushed back, etc., without limitation here, and each of the above-mentioned door bodies 33 can form a gap between the front side wall of the drawer 40.

[0053] In a preferred embodiment of the present invention, a return air vent 39 is further provided at the rear side of the storage cavity 30 for circulating and discharging the air in the storage compartment; and the external circulation air outlet 35 is located above the gap between the front side wall of the drawer and the door body 33. In order to ensure uniform airflow on both sides of the drawer 40 in the external circulation space 45, it is usually preferred to set the return air vent 39 and the external circulation air outlet 35 away from each other, that is, the return air vent 39 is opened at the rear side of the storage cavity 30, and the external circulation air outlet 35 is set close to the door body 33.

[0054] 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.

[0055] refer to Figure 3 As shown in FIG. 1 , the mixing air duct 32 formed inside the top wall of the storage cavity 30 is generally formed in a shape that gradually widens from the air outlet end of the mixing air fan 31, and the inner circulation air outlet 34 and the outer circulation air outlet 35 are also arranged along the width direction of the mixing air duct 32. The inner circulation air outlet 34 and the outer circulation air outlet 35 can be as shown in FIG. Figure 3 The embodiment shown is configured to include multiple internal circulation ventilation holes and external circulation ventilation holes and are evenly arranged along the width direction 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 strips and extend along the width direction of the mixing air duct 32.

[0056] 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 in the bottom wall of the storage cavity 30 and is attached to the bottom wall of the drawer 40 to obtain a first detection temperature; the second temperature sensor 38 is disposed in the mixing air duct 32 and is disposed close to 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 air fan 31 to heat the air flow blown out by the mixing air fan 31.

[0057] The first detected temperature can usually reflect the temperature of the food stored in the drawer 40 or the temperature in the inner circulation space 44, and the second detected temperature can directly reflect the temperature of the air flow blown into the inner circulation space 44 and the outer circulation space 45. According to the detected temperature, the air flow temperature can be further adjusted by the heating device 36 so that it is not too cold relative to the food.

[0058] In particular, in some optional embodiments, the first temperature sensor 37 is arranged close to 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.

[0059] 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.

[0060] Considering that the temperature of food is usually close to room temperature when it is just stored in the storage room, for food stored in the freezer or even in the deep freezer where the temperature is lower, even if the mixed airflow is mixed with the air in the storage room, there is still a huge temperature difference with the food, and direct refrigeration may not be able to evenly reduce the temperature inside and outside the food. Therefore, in the above embodiment, when the difference between the first detected temperature and the second detected temperature is greater than the first threshold, the heating device 36 will be activated to heat the mixed airflow and reduce the temperature difference. When the temperature difference is lower than the second preset value, the heating device 36 will be turned off and refrigeration will be performed normally.

[0061] The first threshold is usually a larger value, generally between 15°C and 30°C, and 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.

[0062] 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.

[0063] 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.

[0064] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in 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 recognized as covering all these 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.

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