Fans and freezers

Abstract

The application relates to the technical field of refrigeration equipment, and discloses a fan, which comprises a volute tongue assembly and a wind wheel arranged in the volute tongue assembly. The volute tongue assembly comprises a first volute and a first volute tongue and a second volute and a second volute tongue. The first volute and the first volute tongue enclose a first fan air outlet. The second volute and the second volute tongue enclose a second fan air outlet. The center of the wind wheel and the first volute tongue form a first auxiliary connecting line, the center of the wind wheel and the second volute tongue form a second auxiliary connecting line, the included angle between the first auxiliary connecting line and the second auxiliary connecting line is greater than 90 degrees and smaller than 180 degrees. By setting the included angle between the first auxiliary connecting line and the second auxiliary connecting line to be greater than 90 degrees and smaller than 180 degrees, the precise control of the air supply amount of the internal space of the refrigerator is realized in cooperation with the air supply air duct of the refrigerator, so that the temperature difference of different positions in the refrigerator is reduced, the temperature uniformity of the refrigerator is improved, and the air cooling effect of the refrigerator is improved. The application further discloses a refrigerator.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, such as a fan and a freezer. Background Technology

[0002] Currently, refrigeration equipment is widely used due to its ability to store items at low temperatures; examples include refrigerators and freezers. Based on refrigeration principles, freezers are generally divided into direct-cooling freezers and air-cooling freezers. For direct-cooling freezers, factors such as the glass door and poor air circulation within the cabinet result in a higher temperature at the top. For air-cooling freezers, the temperature inside the cabinet is greatly affected by the air circulation due to the placement of the air vents; the temperature near the vents is lower, while the temperature further away is higher.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] In related technologies, the temperature difference between different parts of the freezer is large, resulting in poor temperature uniformity within the freezer, which affects the refrigeration efficiency and leads to high energy consumption. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a fan and a freezer to reduce the temperature difference between different locations inside the freezer, improve the temperature uniformity of the freezer, enhance the air-cooling effect of the freezer, and reduce energy consumption.

[0007] In some embodiments, the fan includes a volute and volute tongue assembly and a rotor disposed within the volute and volute tongue assembly. The volute and volute tongue assembly includes a first volute and a first volute tongue, and a second volute and a second volute tongue. The first volute and the first volute tongue form a first fan outlet. The second volute and the second volute tongue form a second fan outlet. The center of the rotor and the first volute tongue form a first auxiliary line, and the center of the rotor and the second volute tongue form a second auxiliary line. The angle between the first auxiliary line and the second auxiliary line is greater than 90° and less than 180°.

[0008] Optionally, the angle between the first auxiliary line and the second auxiliary line is greater than 100° and less than or equal to 140°. Alternatively, the angle between the first auxiliary line and the second auxiliary line is greater than 130° and less than or equal to 140°. Alternatively, the angle between the first auxiliary line and the second auxiliary line is greater than 170° and less than 180°.

[0009] In some embodiments, the freezer includes an inner liner and a fan. The inner liner encloses an internal space and includes a first sidewall, on which a first air supply duct and a second air supply duct are provided. The fan includes a first fan outlet connected to the first air supply duct and a second fan outlet connected to the second air supply duct. The fan is the aforementioned type.

[0010] Optionally, the first air supply duct is disposed on the upper part of the first sidewall, and the second air supply duct is disposed on the lower part of the first sidewall. The angle between the second auxiliary line formed by the center of the impeller and the second volute tongue and a vertical line is greater than or equal to 20° and less than or equal to 60°. Alternatively, the angle between the second auxiliary line formed by the center of the impeller and the second volute tongue and a vertical line is greater than or equal to 20° and less than or equal to 40°.

[0011] Optionally, the first air supply duct includes a first diffuser section duct directly connected to the outlet of the first fan, and a first pressure stabilizing section duct connected to the first diffuser section duct. The second air supply duct includes a second diffuser section duct directly connected to the outlet of the second fan, and a second pressure stabilizing section duct connected to the second diffuser section duct. The total area of ​​the air outlets in the first pressure stabilizing section duct is larger than the area of ​​the air outlets in the second pressure stabilizing section duct.

[0012] Optionally, the first air supply duct includes a first end air outlet located away from the fan, the second air supply duct includes a second end air outlet located away from the fan, and the inner liner includes an end sidewall located near the first and second end air outlets. The horizontal distance between the first end air outlet and the end sidewall is called the first end spacing, the horizontal distance between the second end air outlet and the end sidewall is called the second end spacing, and the first end spacing is less than the second end spacing.

[0013] Optionally, the difference between the first end spacing and the second end spacing is greater than or equal to the length of one air outlet of the first air supply duct. Alternatively, the difference between the first end spacing and the second end spacing is greater than or equal to the length of one air outlet of the second air supply duct.

[0014] Optionally, the freezer also includes a return air cover, an evaporator, and a compressor. The return air cover is located within the internal space and divides the internal space into a storage chamber and an evaporator chamber. The outlet of the evaporator chamber is connected to the inlets of the first and second air supply ducts. The return air cover has a return air inlet, allowing airflow from the storage chamber to flow into the evaporator chamber. The evaporator is located within the evaporator chamber. The compressor is located at the lower part of the evaporator chamber.

[0015] Optionally, the freezer also includes a compressor chamber step. The compressor chamber step protrudes upward from the bottom wall of the inner liner and is located below the return air cover. The compressor chamber step and the bottom wall of the inner liner together form a compressor chamber for housing the compressor.

[0016] Optionally, the relationship between the total volume V of the evaporator and the total area S of the return air vent is: yS=V, where y is greater than or equal to 50 and less than or equal to 1000.

[0017] The fan and freezer provided in this disclosure can achieve the following technical effects:

[0018] The refrigerator provided in this embodiment includes an inner liner and a fan. The inner liner encloses an internal space, and a first air supply duct and a second air supply duct are provided on the first side wall of the inner liner to provide cooling airflow to the internal space enclosed by the inner liner, thereby reducing the temperature of the internal space. The fan includes a volute and volute tongue assembly and a fan wheel disposed within the volute and volute tongue assembly. The first volute and the first volute tongue in the volute and volute tongue assembly form a first fan outlet, and the second volute and the second volute tongue form a second fan outlet. Furthermore, the first air supply duct and the second air supply duct on the first side wall of the inner liner are respectively connected to the first fan outlet and the second fan outlet of the fan. Driven by the fan, the cooling airflow enters the internal space enclosed by the inner liner through the first air supply duct and the second air supply duct, thereby reducing the temperature of the internal space. The center of the fan wheel forms a first auxiliary connection line with the first volute tongue, and the center of the fan wheel forms a second auxiliary connection line with the second volute tongue. By setting the angle between the first auxiliary connection and the second auxiliary connection to be greater than 90° and less than 180°, the fan can precisely control the air volume of different air ducts. This, in conjunction with the first and second air ducts, enables precise control of the air volume of the internal space, thereby reducing the temperature difference between different locations inside the freezer, improving the temperature uniformity of the freezer, enhancing the cooling effect of the freezer, and reducing energy consumption.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0021] Figure 1 This is a schematic diagram of the structure of a freezer provided in an embodiment of this disclosure;

[0022] Figure 2 This is a schematic diagram of the structure of an inner liner and a return air cover provided in an embodiment of this disclosure;

[0023] Figure 3 This is a schematic diagram of the structure of an inner liner and an evaporator assembly provided in an embodiment of this disclosure;

[0024] Figure 4 This is a cross-sectional structural diagram of an inner liner and evaporator assembly provided in an embodiment of this disclosure;

[0025] Figure 5 This is a schematic diagram of the structure of a return air cover and an evaporator assembly provided in an embodiment of this disclosure;

[0026] Figure 6 This is a schematic diagram of another structure provided in this disclosure for the cooperation between the return air cover and the evaporator assembly;

[0027] Figure 7 This is a structural schematic diagram showing the positional relationship between the two evaporators provided in an embodiment of this disclosure;

[0028] Figure 8 This is a schematic diagram of the structure of two evaporators working together according to an embodiment of this disclosure;

[0029] Figure 9 This is a schematic diagram of another structure provided in this disclosure for the cooperation between the return air cover and the evaporator assembly;

[0030] Figure 10 This is a schematic diagram of the structure of a fan and an air supply duct provided in an embodiment of this disclosure;

[0031] Figure 11 This is a schematic diagram of the structure of a fan provided in an embodiment of this disclosure;

[0032] Figure 12 This is a schematic diagram of another fan provided in an embodiment of this disclosure.

[0033] Figure label:

[0034] 1: Inner liner; 11: First side wall; 111: First air supply duct; 1111: First diffuser section duct; 1112: First pressure stabilizing section duct; 1113: First duct air outlet; 112: Second air supply duct; 1121: Second diffuser section duct; 1122: Second pressure stabilizing section duct; 1123: Second duct air outlet; 12: Second side wall; 13: Bottom wall; 14: Compressor chamber step; 15: Air outlet;

[0035] 2: Return air cover; 21: First cover section; 211: First return air inlet; 2111: First return air section; 2112: Return air guide plate; 22: Second cover section; 221: Second return air inlet;

[0036] 3: Evaporator assembly; 31: First evaporator; 311: First edge; 312: Second edge; 313: Third edge; 314: First heat exchange tube assembly; 315: First heating tube assembly; 316: First heat-conducting fin assembly; 32: Second evaporator; 321: Second heat exchange tube assembly; 322: Second heating tube assembly; 323: Second heat-conducting fin assembly; 33: Connecting pipe; 331: First bent pipe section; 332: Second bent pipe section;

[0037] 4: Compressor;

[0038] 5: Fan; 51: Fan wheel; 511: Fan wheel center; 52: Volute and volute tongue assembly; 521: First volute; 522: First volute tongue; 523: Second volute; 524: Second volute tongue; 53: First fan outlet; 54: Second fan outlet;

[0039] 6: Box shell;

[0040] 7: Door body;

[0041] a: Length of the first edge; c: Length of the second edge;

[0042] L: The distance between the first evaporator and the second evaporator;

[0043] m: horizontal insulation spacing; n: vertical insulation spacing;

[0044] g: Depth of the fan casing; h: Distance between the outer side of the fan casing and the evaporator;

[0045] S1: Area of ​​the first return air inlet; S2: Area of ​​the second return air inlet;

[0046] S: Total area of ​​all return air vents; V: Total volume of all evaporator units;

[0047] l1: First auxiliary line; l2: First auxiliary line; l3: Perpendicular line;

[0048] d1: First end spacing; d2: Second end spacing. Detailed Implementation

[0049] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0050] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0051] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0052] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0053] Unless otherwise stated, the term "multiple" means two or more.

[0054] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0056] like Figure 1-9 As shown, this disclosure provides a freezer, particularly a wind-cooled freezer, specifically a wind-cooled horizontal freezer. The freezer includes a cabinet and a door 7, with the door 7 movably located above the cabinet. The cabinet includes a shell 6, an inner liner 1, and insulation material. The inner liner 1 is located inside the shell 6, and the insulation material is located between the shell 6 and the inner liner 1.

[0057] The inner liner 1 includes a bottom wall 13 and side walls. The side walls include a front side wall, a rear side wall, a left side wall, and a right side wall. The front and rear side walls are positioned opposite each other and located at the front and rear ends of the bottom wall 13, respectively, and both extend upwards. The left and right side walls are positioned opposite each other and located at the left and right ends of the bottom wall 13, respectively, and extend upwards. The bottom wall 13, front side walls, rear side walls, left side walls, and right side walls together enclose an internal space. The internal space has an opening that faces upwards, and a door 7 is movably mounted above the opening.

[0058] For ease of description, this application defines the front-back direction as the width direction and the left-right direction as the length direction.

[0059] This disclosure provides a refrigerator with an inner liner 1 including a first sidewall 11 and a second sidewall 12. The first sidewall 11 and the second sidewall 12 are arranged along the width direction of the inner liner 1, and both the first sidewall 11 and the second sidewall 12 define an air supply duct with an air outlet 15. Here, the first sidewall 11 and the second sidewall 12 are arranged along the width direction of the inner liner 1, that is, the first sidewall 11 can be a rear sidewall or a front sidewall, and correspondingly, the second sidewall 12 can be a front sidewall or a rear sidewall. It can be understood that both the front sidewall and the rear sidewall define an air supply duct with an air outlet 15. This enables air to be discharged from the internal space, thereby achieving air cooling.

[0060] The freezer also includes a return air cover 2, located within the internal space and dividing it into a storage chamber and an evaporator chamber. The outlet of the evaporator chamber is connected to the inlet of the air supply duct. The return air cover 2 has a return air vent, allowing airflow from the storage chamber to enter the evaporator chamber. The storage chamber is used to hold items that need to be frozen, such as meat, seafood, or tea. The evaporator chamber generates cooling airflow, which flows from the evaporator chamber to the air supply duct, then into the storage chamber through the air supply vent 15. After exchanging heat with the items in the storage chamber, the cooling airflow returns to the evaporator chamber for recooling. The cooled airflow then flows back into the air supply duct for recirculation. This achieves air circulation in the freezer, enabling air-cooled refrigeration.

[0061] It should be noted that the return air cover 2 can be of various shapes, such as L-shaped or inclined. The evaporator cavity can also be of various shapes and located in different positions within the internal space. For example, the evaporator cavity can be located at the left, middle, or right end of the internal space. In practical applications, the layout of the evaporator cavity and storage cavity can be determined according to the structure of the internal space of the freezer.

[0062] The freezer also includes an evaporator and a fan 5, with the evaporator located inside the evaporator cavity. Optionally, the fan 5 and the air supply duct are located on the same side wall and are connected. The fan 5 drives airflow through the evaporator cavity, the air supply duct, and the storage cavity, before returning to the evaporator cavity via the return air vent, thus forming a circulating airflow path. Here, the evaporator exchanges heat with the airflow within the evaporator cavity to create a cooling airflow. The fan 5 provides power for the airflow. Since the fan 5 and the air supply duct are both located on the same side wall, the airflow from the fan 5 can flow to the air supply duct without passing through a right-angle corner, reducing airflow loss, improving the freezer's cooling effect, and reducing energy consumption.

[0063] In some embodiments, the freezer includes an inner liner 1, a return air cover 2, and an evaporator. The inner liner 1 encloses an internal space and defines an air supply duct with an air outlet 15. The return air cover 2 is located within the internal space and divides the internal space into a storage cavity and an evaporator cavity. The outlet of the evaporator cavity is connected to the inlet of the air supply duct. The return air cover 2 has a return air inlet, through which airflow in the storage cavity can flow into the evaporator cavity. The evaporator is located within the evaporator cavity. The relationship between the total volume V of the evaporator and the total area S of the return air inlet is: yS = V, where y is greater than or equal to 50.

[0064] Combination Figure 9 As shown, taking two evaporators and two return air inlets as an example, the total volume of the two evaporators is V, the area of ​​the first return air inlet 211 is S1, and the area of ​​the second return air inlet 221 is S2. Then the total area S of the return air inlets is the sum of the areas of the first return air inlet 211 and the second return air inlet 221.

[0065] Optionally, y is less than or equal to 1000.

[0066] With this setup, based on the actual cooling temperature requirements, the relationship between the total volume V of the evaporator and the total area S of the return air vent can be satisfied by ensuring that yS=V, where y is greater than or equal to 50, and that y is less than or equal to 1000, thus meeting the actual cooling needs of the user's freezer.

[0067] The return air cover 2 is equipped with a return air inlet. When the freezer is running, the airflow in the evaporator cavity, after its temperature decreases as it passes through the evaporator, flows into the air supply duct under the drive of the fan 5, and then flows into the storage cavity through the air supply inlet 15 to cool the items in the storage cavity. After cooling, the airflow returns to the evaporator cavity through the return air inlet, thus forming the freezer's circulating air path. During the air circulation process, when the air pressure is constant and the width of the air supply duct and the area of ​​the air supply inlet 15 are sufficiently large, the size or area of ​​the return air inlet becomes one of the main factors affecting the air volume during the air circulation process. In this embodiment, 50≤y≤1000, which increases the air volume delivered by the air supply inlet 15 in the freezer's circulating air path.

[0068] It is understandable that the unit of the total volume V of the evaporator is mm. 3 That is, cubic millimeters, the total area S of the return air vent is in mm. 2 That is, square millimeters, in which the value of y is calculated. y can be a unitless constant.

[0069] Optionally, y is greater than or equal to 55 and less than or equal to 700.

[0070] In this embodiment, 55≤y≤700, which improves both the cooling speed and the depth of refrigeration of the freezer. The following explanation uses a single evaporator within the evaporator cavity as an example.

[0071] Table 1

[0072]

[0073] As shown in Table 1 above, when the length, width, and height of the evaporator are 196mm, 180mm, and 100mm respectively, the calculated volume of the evaporator is 3528000mm². 3 Based on the formula yS = V, different y values ​​were obtained by calculating the total area of ​​different return air vents.

[0074] In Table 1, the y-value for Example 1 is 50, for Example 2 it is 56, for Example 3 it is 216, for Example 4 it is 266, for Example 5 it is 574, and for Example 6 it is 985. Examples 3 and 4 have an energy efficiency rating of Level 1, and Examples 2 and 5 have an energy efficiency rating of Level 2, significantly higher than the Level 3 energy efficiency ratings of Examples 1 and 6. That is, when 55 ≤ y ≤ 700, the freezer can achieve a good energy efficiency rating. Optionally, 100 ≤ y ≤ 500.

[0075] Regarding the cooling rate, the cooling rates of Examples 1, 2, 3, and 4 are 97 minutes, 83 minutes, 90 minutes, and 121 minutes, respectively, significantly faster than those of Examples 5 and 6. Furthermore, regarding the cooling depth, the cooling depths of Examples 3 and 4 are -29°C and -27.6°C, respectively, significantly lower than those of Examples 1, 2, 5, and 6. Here, cooling rate refers to the time it takes for the freezer to drop from ambient temperature to -18°C, and cooling depth refers to the lowest temperature the freezer can reach. Furthermore, regarding power consumption, Examples 3 and 4 consume 1.03 kW·h / 24h and 1.14 kW·h / 24h, respectively, significantly less than those of Examples 1, 2, 5, and 6. Optionally, 100 ≤ y ≤ 500.

[0076] Considering the three test parameters of cooling rate, cooling depth, and power consumption, when the y values ​​of Examples 3 and 4 are 216 and 266 respectively, the freezers achieve a lower cooling depth and lower power consumption while maintaining a certain cooling rate, thus qualifying as Level 1 energy efficiency. This is significantly better than Examples 1, 2, 5, and 6.

[0077] It is understandable that when the value of y is greater than or equal to 100 and less than or equal to 500, the freezer can also achieve the same level 1 energy efficiency as in Example 3 or Example 4.

[0078] Optionally, the return air cover 2 includes a first cover portion 21 and a second cover portion 22. The first cover portion 21 is arranged in a horizontal direction. The second cover portion 22 is arranged in a vertical direction and is connected to the first cover portion 21. At least one of the first cover portion 21 and the second cover portion 22 is provided with a return air vent.

[0079] Combination Figure 2 and Figure 5 As shown, the return air cover 2 includes a first cover portion 21 arranged horizontally and a second cover portion 22 arranged vertically, and the first cover portion 21 and the second cover portion 22 are connected. Here, the first cover portion 21 and the second cover portion 22 can be detachably connected or non-detachably connected. Furthermore, at least one of the first cover portion 21 and the second cover portion 22 is provided with a return air vent, so that the airflow inside the freezer can circulate during operation.

[0080] It is understood that the return air cover 2 is provided with one or more return air vents. For example, when there is only one return air vent, it is located in the first cover portion 21, or it is located in the second cover portion 22. When there are multiple return air vents, they may be located only in the first cover portion 21 or the second cover portion 22, or they may be located partly in the first cover portion 21 and partly in the second cover portion 22.

[0081] Optionally, the freezer also includes a compressor chamber step 14. The compressor chamber step 14 protrudes upwards from the bottom wall 13 of the inner liner 1 and includes a vertical step plate and a horizontal step plate. The compressor chamber step 14 and the bottom wall 13 of the inner liner 1 together form a compressor chamber for housing the compressor 4. The vertical step plate is connected to the second cover portion 22 of the return air cover 2, and at least one connection point of the vertical step plate to the second cover portion 22 is provided with a return air inlet communicating with the evaporator chamber. The total area S of the return air inlets is the sum of the areas of all return air inlets.

[0082] The freezer needs to house components such as the compressor 4 and the condenser. Therefore, the compressor chamber step 14, which protrudes upward from the bottom wall 13 of the inner liner 1, includes a vertical step plate and a horizontal step plate, forming a compressor chamber together with the bottom wall 13 of the inner liner 1 to house the compressor 4. Furthermore, a return air vent connected to the evaporator chamber is provided at the connection between the vertical step plate and the second cover plate 22, which can be used for air circulation within the freezer.

[0083] Optionally, the return air cover 2 is located on the upper part of the compressor chamber step 14.

[0084] Understandably, the return air cover 2 is positioned above the compressor chamber step 14. This allows the return air cover 2, the compressor chamber step 14, and the side wall of the inner liner 1 to enclose the evaporator chamber for housing the evaporator. With the evaporator located above the compressor chamber step 14, the evaporator does not excessively occupy the internal space of the inner liner 1, ensuring the storage capacity of the storage compartment and making the evaporator chamber more compact, thus reducing the bulkiness of the freezer interior.

[0085] Optionally, the evaporator includes a first evaporator 31 and a second evaporator 32. The first evaporator 31 is disposed at one end of the evaporator cavity, and the angle between the first evaporator 31 and the horizontal direction is less than or equal to a first angle. The second evaporator 32 is disposed at the other end of the evaporator cavity, and the angle between the second evaporator 32 and the horizontal direction is less than or equal to the first angle. The total volume V of the evaporator is the sum of the volumes of the first evaporator 31 and the second evaporator 32.

[0086] By configuring a first evaporator 31 and a second evaporator 32, with the first evaporator 31 located at one end of the evaporator cavity and the second evaporator 32 located at the other end, the refrigeration efficiency inside the freezer can be improved. Furthermore, the angles between the first evaporator 31 and the horizontal direction are both less than or equal to a first angle, allowing the first evaporator 31 and the second evaporator 32 to be in an inclined state, facilitating the drainage of defrost water. Specifically, the first angle can be 10°, 15°, 20°, 25°, or 30°. Both the first evaporator 31 and the second evaporator 32 are provided with drain outlets, and both are inclined towards the drain outlets so that the defrost water generated by the first evaporator 31 and the second evaporator 32 flows out of the freezer through the drain outlets.

[0087] Optionally, the evaporator cavity includes a return air cavity located between the first evaporator 31 and the second evaporator 32. The first cover plate portion 21 is provided with a first return air inlet 211 located at the top of the return air cavity, and the second cover plate portion 22 is provided with a second return air inlet 221 located on the side of the return air cavity. The area of ​​the first return air inlet 211 is greater than or equal to the area of ​​the second return air inlet 221.

[0088] With this configuration, a return air chamber is provided between the first evaporator 31 and the second evaporator 32. This ensures that the airflow inside the freezer, after entering the return air chamber through the return air inlet, flows to the first evaporator 31 and the second evaporator 32 on either side, thus preventing interference between the airflows flowing to the two evaporators. Furthermore, a first return air inlet 211 located at the top of the return air chamber and a second return air inlet 221 located on the side of the return air chamber are respectively provided on the first cover plate 21 and the second cover plate 22, which can further improve the return air efficiency and thus enhance the airflow circulation efficiency inside the freezer.

[0089] Optionally, the first return air vent 211 includes a plurality of first return air sections 2111 arranged side by side. The width of the first return air section 2111 is less than or equal to a first width threshold, and / or the length of the first return air section 2111 is greater than or equal to a first length threshold.

[0090] This configuration, with multiple first return air sections 2111 arranged side-by-side in the first return air inlet 211, allows airflow to enter the return air cavity more effectively through the first return air inlet 211, improving the return air efficiency. Furthermore, the width of the first return air section 2111 can be set to be less than or equal to a first width threshold, or the length of the first return air section 2111 can be set to be greater than or equal to a first length threshold. Alternatively, the width of the first return air section 2111 can be set to be less than or equal to the first width threshold, while the length of the first return air section 2111 can be set to be greater than or equal to the first length threshold. This ensures that the first return air section 2111 maintains a certain return air area, thereby guaranteeing the overall return air efficiency of the first return air inlet 211.

[0091] Optionally, a return air guide plate 2112 is provided on the upper part of the first return air inlet 211.

[0092] like Figure 5 As shown, by setting a return air guide plate 2112 above the first return air inlet 211, the airflow can flow directly into the return air cavity through the guiding effect of the return air guide plate 2112, and then flow to the evaporator, reducing airflow turbulence.

[0093] Optionally, the inner liner 1 includes a first sidewall 11, which defines an air supply duct with an air outlet 15. A fan 5 is installed inside the air supply duct.

[0094] With this configuration, an air supply duct with an air outlet 15 is defined on the first side wall 11 of the inner liner 1, and a fan 5 is installed within the air supply duct. When the freezer is running, the airflow in the evaporator cavity, after its temperature decreases as it passes through the evaporator, flows into the air supply duct under the drive of the fan 5, and then flows through the air outlet 15 into the storage cavity to cool the items inside. Finally, the airflow returns to the evaporator cavity through the return air vent. This allows the temperature inside the freezer to be lowered to the set temperature to meet the user's actual cooling needs.

[0095] In some embodiments, the freezer includes an inner liner 1, a return air cover 2, and an evaporator assembly 3. The inner liner 1 encloses an internal space and defines an air supply duct with an air outlet 15. The return air cover 2 is located within the internal space and divides the internal space into a storage cavity and an evaporator cavity containing the evaporators. The outlet of the evaporator cavity is connected to the inlet of the air supply duct. The return air cover 2 has a return air inlet, through which airflow in the storage cavity can flow into the evaporator cavity. The evaporator assembly 3 includes a first evaporator 31 and a second evaporator 32 disposed within the evaporator cavity. The evaporator cavity includes a return air cavity located between the first evaporator 31 and the second evaporator 32. The distance L between the first evaporator 31 and the second evaporator 32 satisfies: L≥S / (a'+c'). Wherein, S is the total area of ​​the return air inlet, a' and c' are the lengths of the return air cavity or two different locations of the first evaporator 31, and at least one of the two different locations is close to the return air inlet.

[0096] Combination Figure 3 and Figure 7 As shown, the evaporator group 3 includes a first evaporator 31 and a second evaporator 32 disposed within the evaporator cavity, and the evaporator cavity includes a return air cavity located between the first evaporator 31 and the second evaporator 32. In this way, the airflow inside the freezer flows into the return air cavity through the return air inlet and then flows to the first evaporator 31 and the second evaporator 32 on both sides respectively, thus avoiding mutual interference between the airflows flowing to the two evaporators. The distance L between the first evaporator 31 and the second evaporator 32 is set such that: L≥S / (a'+c'). Where S is the total area of ​​the return air inlet, a' and c' are the lengths of two different locations in the return air cavity or the first evaporator 31, and at least one of the two different locations is close to the return air inlet. This allows for a more reasonable spacing between the multiple evaporators, enabling the freezer to effectively cool and meet actual cooling requirements.

[0097] As mentioned above, yS=V. When the length, width, and height of the first evaporator and the second evaporator are a, b, and c respectively, and their volumes are both V, L≥2V / y(a'+c'), or L≥2abc / y(a'+c').

[0098] Optionally, the return air cover 2 includes a first cover portion 21 arranged in a horizontal direction, and the first cover portion 21 is provided with a first return air inlet 211 located at the top of the return air cavity. Wherein, a' is the length of a position in the return air cavity near the first return air inlet 211, and a' is greater than or equal to the length of the first return air inlet 211, and less than or equal to the total length of the first cover portion 21 along the length direction of the first return air inlet 211.

[0099] This configuration, with a first return air inlet 211 located at the top of the return air cavity on the first cover plate 21, allows for more efficient airflow into the return air cavity through the first return air inlet 211, thus improving the airflow circulation efficiency within the freezer. The length of a position within the return air cavity near the first return air inlet 211 is defined as a', which is greater than or equal to the length of the first return air inlet 211 and less than or equal to the total length of the first cover plate 21 along the length direction of the first return air inlet 211. This allows for a larger contact area between the airflow entering the return air cavity from the first return air inlet 211 and the evaporator, thereby increasing the heat exchange efficiency of the evaporator.

[0100] Optionally, the first evaporator 31 includes a first edge 311 near the first return air inlet 211 and having a first length a. The length of a' is equal to the first length a of the first edge 311.

[0101] With this configuration, the first evaporator 31 is located near the first return air inlet 211 and has a first edge 311 with a first length a, which is one side of the windward side of the first evaporator 31. Setting the length value of a' equal to the first length a of the first edge 311 can increase the contact area between the windward side of the first evaporator 31 and the return air cavity, thereby increasing the heat exchange efficiency of the evaporator.

[0102] Optionally, the return air cover 2 further includes a second cover portion 22 arranged vertically, the second cover portion 22 having a second return air inlet 221 located on the side of the return air cavity. Here, c' is the length of a position within the return air cavity near the second return air inlet 221, and c' is greater than or equal to the length of the second return air inlet 221, and less than or equal to the total length of the second cover portion 22 along the length direction of the second return air inlet 221.

[0103] This configuration, with a second return air inlet 221 located on the side of the return air cavity in the second cover portion 22, allows for more efficient airflow into the return air cavity through the second return air inlet 221, thereby increasing the airflow circulation efficiency within the freezer. The length of a position within the return air cavity near the second return air inlet 221 is defined as c', where c' is greater than or equal to the length of the second return air inlet 221, and less than or equal to the total length of the second cover portion 22 along the length direction of the second return air inlet 221. This allows for a larger contact area between the airflow entering the return air cavity from the second return air inlet 221 and the evaporator, thus increasing the heat exchange efficiency of the evaporator.

[0104] Optionally, the first evaporator 31 includes a second edge 312 near the second return air inlet 221 and having a second length c. The length of c' is equal to the second length c of the second edge 312. That is, L≥2V / y(a+c), or L≥2abc / y(a+c).

[0105] With this configuration, the second edge 312 of the first evaporator 31, which is close to the second return air inlet 221 and has a second length c, is the other side of the windward side of the first evaporator 31. Setting the length value of c' equal to the second length c of the second edge 312 can increase the contact area between the windward side of the first evaporator 31 and the return air cavity, thereby increasing the heat exchange efficiency of the evaporator.

[0106] In some embodiments, the freezer includes an inner liner 1, a return air cover 2, an evaporator, and a compressor 4. The inner liner 1 encloses an internal space and defines an air duct with an air outlet 15. The return air cover 2 is located within the internal space and divides the internal space into a storage cavity and an evaporator cavity in which the evaporator is located. The outlet of the evaporator cavity is connected to the inlet of the air duct. The return air cover 2 has a return air inlet, through which airflow in the storage cavity can flow into the evaporator cavity. The compressor 4 is located at the lower part of the evaporator. The return air cover 2 includes a side cover portion, and a horizontal thermal insulation distance m is provided between the evaporator and the side cover portion.

[0107] Combination Figure 6 As shown, the freezer includes an inner liner 1, a return air cover 2, an evaporator, and a compressor 4. The return air cover 2 includes a side cover section. A horizontal thermal insulation gap m is set between the evaporator and the side cover section to insulate the evaporator, prevent the loss of cold air from the evaporator, and thus ensure the heat exchange effect between the airflow inside the freezer and the evaporator, thereby improving the cooling effect of the freezer.

[0108] Optionally, the horizontal thermal insulation spacing m is greater than or equal to 2 mm. And / or, the horizontal thermal insulation spacing m is less than or equal to 50 mm.

[0109] By setting the horizontal insulation spacing *m* to be greater than or equal to 2 mm, the insulation requirements for the evaporator cavity can be met, thus ensuring the cooling effect of the freezer. Furthermore, setting the horizontal insulation spacing *m* to be less than or equal to 50 mm allows for space saving while still meeting the insulation requirements for the evaporator cavity. It also saves on filler material. Setting the horizontal insulation spacing *m* to less than 2 mm results in poor insulation of the evaporator cavity. Setting it to greater than 50 mm, however, occupies more space and wastes more filler material.

[0110] Optionally, the return air cover 2 includes a first cover portion 21 arranged in a horizontal direction. A vertical thermal insulation distance n is provided between the evaporator and the first cover portion 21.

[0111] A vertical thermal insulation gap n is set between the evaporator and the first cover plate 21 to insulate the evaporator, prevent the loss of cold energy from the evaporator, and thus ensure the heat exchange effect between the airflow in the freezer and the evaporator, thereby improving the cooling effect of the freezer.

[0112] Optionally, the vertical thermal insulation spacing n is greater than or equal to 2 mm. And / or, the vertical thermal insulation spacing n is less than or equal to 50 mm.

[0113] By setting the vertical insulation spacing *n* to be greater than or equal to 2 mm, the insulation requirements for the evaporator cavity temperature can be met, thus ensuring the cooling effect of the freezer. Furthermore, setting the vertical insulation spacing *n* to be less than or equal to 50 mm allows for space saving while still meeting the insulation requirements for the evaporator cavity temperature. It also saves on filling material. If the vertical insulation spacing *n* is less than 2 mm, the insulation effect for the evaporator cavity temperature is poor. Conversely, setting the vertical insulation spacing *n* to be greater than 50 mm would occupy more space and waste more filling material.

[0114] Optionally, the horizontal insulation spacing m is filled with insulation material. And / or, the vertical insulation spacing n is filled with insulation material.

[0115] Insulating material, such as foam, is filled at certain horizontal insulation gaps (m) or vertical insulation gaps (n). Since the temperature inside the evaporator cavity is low, this foam of a certain thickness effectively inhibits heat exchange between the evaporator cavity and the air inside the outer cabinet, thus maintaining the temperature inside the evaporator cavity and ensuring the heat exchange effect between the airflow and the evaporator within the freezer. Simultaneously, the foam of a certain thickness also provides support for the side cover or the first cover 21. Furthermore, insulation material can be filled at both the horizontal insulation gap (m) and the vertical insulation gap (n), further enhancing the insulation effect on the temperature inside the evaporator cavity.

[0116] Optionally, the volute depth g of the fan 5 is greater than or equal to 50 mm. And / or, the volute depth g of the fan 5 is less than or equal to 150 mm.

[0117] Combination Figure 4As shown, by setting the volute depth g of the fan 5 to be greater than or equal to 50mm, the operation of the fan 5 can be guaranteed to be undisturbed, ensuring effective airflow circulation within the freezer. Furthermore, setting the volute depth g of the fan 5 to be less than or equal to 150mm saves more space while still ensuring undisturbed operation. Setting the volute depth g of the fan 5 to less than 50mm might affect its normal operation. Setting the volute depth g of the fan 5 to greater than 150mm would occupy more space.

[0118] Optionally, the distance h between the outer side of the volute of the fan 5 and the evaporator is greater than or equal to 10 mm. And / or, the distance h between the outer side of the volute of the fan 5 and the evaporator is less than or equal to 200 mm.

[0119] Combination Figure 6 As shown, by setting the distance h between the outer side of the fan 5's volute and the evaporator to be greater than or equal to 10mm, sufficient distance is ensured that the return airflow, after heat exchange with the evaporator, has enough space to be re-rectified and re-enter the fan 5's volute duct for effective airflow circulation. Furthermore, setting the distance h between the outer side of the fan 5's volute and the evaporator to be less than or equal to 200mm saves space within the evaporator cavity while still ensuring sufficient distance for effective airflow circulation within the fan 5's volute duct after heat exchange with the evaporator. If the distance h between the outer side of the fan 5's volute and the evaporator is less than 10mm, the efficiency of the return airflow re-entering the fan 5's volute duct after heat exchange with the evaporator will be affected, thus impacting the effective airflow circulation within the freezer. Conversely, setting the distance h between the outer side of the fan 5's volute and the evaporator to be greater than 200mm would waste space within the evaporator cavity.

[0120] Optionally, the freezer also includes a compressor chamber step 14. The compressor chamber step 14 protrudes upward from the bottom wall 13 of the inner liner 1 and is located at the lower part of the return air cover 2. The compressor chamber step 14 and the bottom wall 13 of the inner liner 1 together form a compressor chamber for housing the compressor 4.

[0121] With this configuration, the freezer needs to house components such as the compressor 4 and condenser. Therefore, the compressor chamber step 14, which protrudes upward from the bottom wall 13 of the inner liner 1, together with the bottom wall 13 of the inner liner 1, forms a compressor chamber that can house the compressor 4. It is understandable that by placing the compressor chamber step 14 below the return air cover 2, the return air cover 2, the compressor chamber step 14, and the side wall of the inner liner 1 can enclose an evaporator chamber for housing the evaporator. With the evaporator located above the compressor chamber step 14, the evaporator does not excessively occupy the internal space of the inner liner 1, ensuring the storage capacity of the storage compartment and making the evaporator chamber more compact, reducing the bulkiness of the freezer's interior.

[0122] In some embodiments, the freezer includes an inner liner 1, a return air cover 2, and an evaporator assembly 3. The inner liner 1 encloses an internal space and defines an air duct with an air outlet 15. The return air cover 2 is located within the internal space and divides the internal space into a storage cavity and an evaporator cavity. The outlet of the evaporator cavity is connected to the inlet of the air duct. The return air cover 2 has a return air inlet, through which airflow in the storage cavity can flow into the evaporator cavity. The evaporator assembly 3 includes a first evaporator 31 and a second evaporator 32 disposed in the evaporator cavity, and a connecting pipe 33 connecting the first evaporator 31 and the second evaporator 32. A foamed layer is disposed within the evaporator cavity, and at least a portion of the connecting pipe 33 is disposed within the foamed layer.

[0123] The freezer includes an inner liner 1, a return air cover 2, and an evaporator assembly 3. The inner liner 1 defines an air duct with an air outlet 15, providing cooling airflow to the internal space enclosed by the inner liner 1 to lower the internal temperature. The return air cover 2 has a return air inlet. When the freezer is running, the airflow in the evaporator cavity, after its temperature decreases as it passes through the evaporator, flows into the air duct under the drive of the fan 5, and then flows through the air outlet 15 into the storage cavity to cool the items inside. The air then flows back into the evaporator cavity through the return air inlet. The evaporator assembly 3 includes a first evaporator 31 and a second evaporator 32 disposed within the evaporator cavity, and a connecting pipe 33 connecting the first evaporator 31 and the second evaporator 32. This arrangement of two connected evaporators improves the freezer's cooling efficiency. By placing at least a portion of the connecting pipe 33 within the foam layer inside the evaporator cavity, frost buildup on the connecting pipe 33 is prevented from affecting the heat exchange efficiency of the connected evaporators, thereby improving the freezer's cooling effect.

[0124] Optionally, the foaming layer includes at least a bottom foaming layer disposed at the bottom of the evaporator assembly 3. At least a portion of the connecting pipe 33 is disposed within the bottom foaming layer.

[0125] This configuration, with at least a portion of the connecting pipe 33 positioned within the bottom foaming layer of the evaporator assembly 3, prevents the entire connecting pipe 33 from frosting over, thus avoiding impact on the heat exchange efficiency of the evaporator. Simultaneously, it reduces the uncertainty of the connecting pipe 33 being suspended in the air and subjected to pulling, preventing damage to the connecting pipe 33.

[0126] Optionally, the first evaporator 31 and the second evaporator 32 are connected in series or in parallel.

[0127] With this configuration, when the first evaporator 31 and the second evaporator 32 are connected in series, their temperatures can be uniformly controlled, ensuring that the airflow temperatures exiting the air ducts of both evaporators are similar or identical. When the first evaporator 31 and the second evaporator 32 are connected in parallel, each evaporator can be controlled independently, thereby allowing for independent control of the airflow outlet temperatures of both evaporators and preventing mutual interference between them.

[0128] Optionally, the inner liner 1 includes a first sidewall 11 defining a first air supply duct 111 with an air outlet 15, wherein a first fan 5 is disposed within the first air supply duct 111, and the first inlet and first outlet of the first evaporator 31 are disposed on the side near the first fan 5. And / or, the inner liner 1 includes a second sidewall 12 defining a second air supply duct 112 with an air outlet 15, wherein a second fan 5 is disposed within the second air supply duct 112, and the second inlet and second outlet of the second evaporator 32 are disposed on the side near the second fan 5.

[0129] This configuration defines a first air duct 111 with an air outlet 15 and a first fan 5 inside the first side wall 11 of the inner liner 1. The first inlet and first outlet of the first evaporator 31 are positioned near the first fan 5. This allows airflow from the freezer to exit through the first side wall 11, pass through the return air inlet of the return air cover 2, and circulate through the first evaporator 31. Similarly, a second air duct 112 with an air outlet 15 and a second fan 5 inside the second side wall 12 of the inner liner 1 is defined. The second inlet and second outlet of the second evaporator 32 are positioned near the second fan 5. This allows airflow from the freezer to exit through the second side wall 12, pass through the return air inlet of the return air cover 2, and circulate through the second evaporator 32. Thus, the airflow from the freezer exits through the first side wall 11 and the second side wall 12 and returns through the return air inlet of the return air cover 2, shortening the airflow distance, reducing obstruction by other components, and improving the freezer's cooling efficiency.

[0130] Optionally, the connecting pipe 33 is disposed below the first inlet and the first outlet of the first evaporator 31. And / or, the connecting pipe 33 is disposed below the second inlet and the second outlet of the second evaporator 32.

[0131] With this configuration, the connecting pipe 33 is positioned below the first inlet and first outlet of the first evaporator 31, or below the second inlet and second outlet of the second evaporator 32. This facilitates the flow of refrigerant between the first evaporator 31 and the second evaporator 32. Furthermore, the connecting pipe 33 can be positioned close to the bottom of the evaporator cavity, reducing bends and length, and making installation easier.

[0132] Optionally, the first evaporator 31 includes a first heat exchange tube assembly 314 and a first heating tube assembly 315 at least partially disposed below the first heat exchange tube assembly 314. And / or, the second evaporator 32 includes a second heat exchange tube assembly 321 and a second heating tube assembly 322 at least partially disposed below the second heat exchange tube assembly 321.

[0133] In this configuration, at least a portion of the first heating tube group 315 of the first evaporator 31 is positioned below the first heat exchange tube group 314 for defrosting the first evaporator 31. Alternatively, at least a portion of the second heating tube group 322 of the second evaporator 32 is positioned below the second heat exchange tube group 321 for defrosting the second evaporator 32. Furthermore, at least a portion of the first heating tube group 315 of the first evaporator 31 and at least a portion of the second heating tube group 322 of the second evaporator 32 can be simultaneously positioned below the first heat exchange tube group 314 and the second heat exchange tube group 321, respectively, for defrosting the first evaporator 31 and the second evaporator 32, thus not affecting the heat exchange efficiency of the first evaporator 31 and the second evaporator 32.

[0134] In some embodiments, the freezer includes an inner liner 1, a return air cover 2, and an evaporator assembly 3. The inner liner 1 encloses an internal space and defines an air duct with an air outlet 15. The return air cover 2 is located within the internal space and divides the internal space into a storage cavity and an evaporator cavity. The outlet of the evaporator cavity is connected to the inlet of the air duct. The return air cover 2 has a return air inlet, through which airflow in the storage cavity can flow into the evaporator cavity. The evaporator assembly 3 includes a first evaporator 31 and a second evaporator 32 disposed in the evaporator cavity, and a connecting pipe 33 connecting the first evaporator 31 and the second evaporator 32. The evaporator assembly 3 includes a heat-conducting fin assembly and a heat exchange tube assembly penetrating the heat-conducting fin assembly. At least a portion of the connecting pipe 33 is less than or equal to the heat transfer distance between the heat-conducting fin assembly and the connecting pipe 33.

[0135] Combination Figure 8 As shown, the freezer includes an inner liner 1, a return air cover 2, and an evaporator assembly 3. The inner liner 1 defines an air supply duct with an air outlet 15, which provides cooling airflow to the internal space enclosed by the inner liner 1 to lower the temperature of the internal space. The return air cover 2 has a return air inlet. When the freezer is running, the airflow in the evaporator cavity is cooled down by the evaporator and then, driven by the fan 5, flows into the air supply duct, then through the air outlet 15 into the storage cavity to cool the items in the storage cavity, before flowing back into the evaporator cavity through the return air inlet. The evaporator assembly 3 includes a first evaporator 31 and a second evaporator 32 disposed in the evaporator cavity, and a connecting pipe 33 connecting the first evaporator 31 and the second evaporator 32. This arrangement of two connected evaporators improves the cooling efficiency of the freezer. By setting the distance between at least a portion of the connecting pipe 33 and the heat-conducting fin assembly to be less than or equal to the heat transfer distance, it is possible to prevent the connecting pipe 33 from being completely frosted or to allow the connecting pipe 33 to defrost as soon as possible after frosting, thereby ensuring the heat exchange efficiency of the evaporator and improving the cooling effect of the freezer.

[0136] Optionally, the heat transfer distance is less than or equal to 10 mm.

[0137] This setting, with the heat transfer distance less than or equal to 10mm, ensures that the connecting pipe 33 is protected from frost or that defrosting is accelerated, thereby guaranteeing the heat exchange efficiency of the evaporator. If the heat transfer distance is set greater than 10mm, it will affect the heat transfer from the heat-conducting fins to the connecting pipe, thus affecting the defrosting efficiency of the connecting pipe 33 after frost formation.

[0138] Optionally, the evaporator cavity includes a return air cavity located between the first evaporator 31 and the second evaporator 32. At least a portion of the connecting pipe 33 is disposed in the return air cavity.

[0139] With this configuration, a return air chamber is provided between the first evaporator 31 and the second evaporator 32. This ensures that the airflow inside the freezer, after entering the return air chamber through the return air inlet, flows to the first evaporator 31 and the second evaporator 32 respectively, preventing interference between the airflows flowing to the two evaporators. At least a portion of the connecting pipe 33 is located within the return air chamber, allowing the airflow entering through the return air inlet to pass through the connecting pipe 33. This brings it closer to the freezer's defrosting device, facilitating better defrosting of the connecting pipe 33.

[0140] Optionally, the first evaporator 31 includes a first heat-conducting fin group 316, and the connecting pipe 33 includes a first bent pipe section 331 at a distance from the first heat-conducting fin group 316 that is less than or equal to the heat transfer distance. And / or, the second evaporator 32 includes a second heat-conducting fin group 323, and the connecting pipe 33 includes a second bent pipe section 332 at a distance from the second heat-conducting fin group 323 that is less than or equal to the heat transfer distance.

[0141] By setting the distance between the first bend in the connecting pipe 331 and the first heat-conducting fin to be less than or equal to the heat transfer distance, it is ensured that the first heat-conducting fin effectively conducts heat to the first bend in the connecting pipe 331, thereby preventing the connecting pipe 33 from completely frosting or ensuring that the connecting pipe 33 defrosts quickly after frosting. Similarly, by setting the distance between the second bend in the connecting pipe 332 and the second heat-conducting fin to be less than or equal to the heat transfer distance, it is ensured that the second heat-conducting fin effectively conducts heat to the second bend in the connecting pipe 332, thereby preventing the connecting pipe 33 from completely frosting or ensuring that the connecting pipe 33 defrosts quickly after frosting.

[0142] Optionally, the first inlet and first outlet of the first evaporator 31 are disposed on one side facing the return air cavity. And / or, the second inlet and second outlet of the second evaporator 32 are disposed on one side facing the return air cavity.

[0143] This configuration, with the first inlet and first outlet of the first evaporator 31 facing the return air cavity, facilitates the flow of refrigerant from the first evaporator 31 to the second evaporator 32. Similarly, the second inlet and second outlet of the second evaporator 32 are positioned facing the return air cavity, facilitating the flow of refrigerant from the second evaporator 32 to the first evaporator 31. Furthermore, the fact that both the first inlet and first outlet of the first evaporator 31, and the second inlet and second outlet of the second evaporator 32, face the return air cavity further enhances the flow of refrigerant between the two evaporators, thereby improving the cooling effect of the freezer.

[0144] Optionally, the freezer also includes a compressor 4. The compressor 4 is located at the lower part of the evaporator assembly 3.

[0145] Optionally, the freezer also includes a compressor chamber step 14. The compressor chamber step 14 protrudes upward from the bottom wall 13 of the inner liner 1 and is located at the lower part of the return air cover 2. The compressor chamber step 14 and the bottom wall 13 of the inner liner 1 together form a compressor chamber for housing the compressor 4.

[0146] With this configuration, the freezer needs to house components such as the compressor 4 and condenser. Therefore, the compressor chamber step 14, which protrudes upward from the bottom wall 13 of the inner liner 1, together with the bottom wall 13 of the inner liner 1, forms a compressor chamber that can house the compressor 4. It is understandable that by placing the compressor chamber step 14 below the return air cover 2, the return air cover 2, the compressor chamber step 14, and the side wall of the inner liner 1 can enclose an evaporator chamber for housing the evaporator. With the evaporator located above the compressor chamber step 14, the evaporator does not excessively occupy the internal space of the inner liner 1, ensuring the storage capacity of the storage compartment and making the evaporator chamber more compact, thus increasing the usable space of the freezer.

[0147] In some embodiments, the fan 5 includes a volute and volute tongue assembly 52 and a rotor 51 disposed within the volute and volute tongue assembly 52. ​​The volute and volute tongue assembly 52 includes a first volute 521, a first volute tongue 522, a second volute 523, and a second volute tongue 524. The first volute 521 and the first volute tongue 522 form a first fan outlet 53. The second volute 523 and the second volute tongue 524 form a second fan outlet 54. The rotor center 511 and the first volute tongue 522 form a first auxiliary connection line, and the rotor center 511 and the second volute tongue 524 form a second auxiliary connection line. The angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°.

[0148] Combination Figure 11 As shown, the fan 5 includes a volute and volute tongue assembly 52 and an impeller 51 disposed within the volute and volute tongue assembly 52. ​​The first volute 521 and the first volute tongue 522 in the volute and volute tongue assembly 52 form a first fan outlet 53, and the second volute 523 and the second volute tongue 524 form a second fan outlet 54. The impeller center 511 forms a first auxiliary connection line l1 and a second auxiliary connection line l2 with the first volute tongue 522 and the second volute tongue 524, respectively. By setting the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 to be greater than 90° and less than 180°, the fan 5 can precisely control the airflow to different air ducts, thereby achieving precise control of the airflow to the internal space, improving the temperature uniformity of the freezer, enhancing the freezer's cooling effect, and reducing energy consumption.

[0149] In some embodiments, the first volute tongue 522 in the volute tongue assembly 52 of the fan 5 is arc-shaped, such as... Figure 12 As shown. The impeller center 511 forms a first auxiliary connection line l1 with the first volute tongue 522 and the second volute tongue 524, respectively. In this case, the first auxiliary connection line l1 is the line connecting the impeller center 511 and the arc end of the first volute tongue 522 near the first fan outlet 53.

[0150] Specifically, the included angle between the first auxiliary connection l1 and the second auxiliary connection l2 can be set to 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or 175°, and can be selected and set according to different air supply velocity ratio requirements of the first air supply duct 111 and the second air supply duct 112.

[0151] In some embodiments, the freezer includes an inner liner 1 and a fan 5. The inner liner 1 encloses an internal space and includes a first sidewall 11. The first sidewall 11 is provided with a first air supply duct 111 and a second air supply duct 112. The fan 5 includes a first fan outlet 53 connected to the first air supply duct 111 and a second fan outlet 54 connected to the second air supply duct 112. The fan 5 is the aforementioned fan 5.

[0152] The refrigerator provided in this embodiment includes an inner liner 1 and a fan 5. The inner liner 1 encloses an internal space. A first air supply duct 111 and a second air supply duct 112 are provided on the first side wall 11 of the inner liner 1, which can provide cooling airflow to the internal space enclosed by the inner liner 1 to reduce the temperature of the internal space. The fan 5 includes a volute assembly 52 and a fan wheel 51 disposed within the volute assembly 52. ​​The first volute 521 and the first volute 522 of the volute assembly 52 form a first fan outlet 53, and the second volute 523 and the second volute 524 form a second fan outlet 54. Furthermore, the first air supply duct 111 and the second air supply duct 112 on the first side wall 11 of the inner liner 1 are respectively connected to the first fan outlet 53 and the second fan outlet 54 of the fan 5. Driven by the fan 5, the cooling airflow enters the inner liner 1 through the first air supply duct 111 and the second air supply duct 112, enclosing the internal space and reducing the temperature of the internal space. The impeller center 511 and the first volute tongue 522 form a first auxiliary connection line l1, and the impeller center 511 and the second volute tongue 524 form a second auxiliary connection line l2. By setting the angle between the first and second auxiliary connection lines to be greater than 90° and less than 180°, the fan 5 can precisely control the airflow volume of different ducts, thereby achieving precise control of the airflow volume within the internal space. This improves the temperature uniformity of the freezer, enhances its cooling effect, and reduces energy consumption.

[0153] Optionally, the first air supply duct 111 is disposed on the upper part of the first sidewall 11, and the second air supply duct 112 is disposed on the lower part of the first sidewall 11. The angle between the second auxiliary line l2 formed by the impeller center 511 and the second volute tongue 524 and a vertical line l3 is greater than or equal to 20° and less than or equal to 60°. Alternatively, the angle between the second auxiliary line l2 formed by the impeller center 511 and the second volute tongue 524 and a vertical line l3 is greater than or equal to 20° and less than or equal to 40°.

[0154] In this way, the setting position of the second volute tongue can be determined by the angle between the second auxiliary line l2 and the vertical line l3. Furthermore, the setting position of the first volute tongue can be determined by the angle between the first auxiliary line l1 and the second auxiliary line l2. That is, the fan 5 can further achieve precise air delivery to the first air supply duct 111 and the second air supply duct 112.

[0155] Optionally, the angle between the first auxiliary line l1 and the second auxiliary line l2 is greater than 100° and less than or equal to 140°. Alternatively, the angle between the first auxiliary line l1 and the second auxiliary line l2 is greater than 130° and less than or equal to 140°. Alternatively, the angle between the first auxiliary line l1 and the second auxiliary line l3 is greater than 170° and less than 180°.

[0156] Combination Figure 10 and Figure 11 As shown, the upper and lower parts of the first sidewall 11 of the inner liner 1 are respectively provided with a first air supply duct 111 and a second air supply duct 112. The first air supply duct 111 is provided with a first air outlet 1113, and the second air supply duct 112 is provided with a second air outlet 1123. When the freezer is running, during the air circulation process, the fan 5 uses the first air supply duct 111 and the second air supply duct 112 to deliver cooling airflow into the internal space enclosed by the inner liner 1 through the first air outlet and the second air outlet. When the air pressure is constant, due to the natural sinking of cold air, the ratio between the air supply volume of the first air supply duct 111 and the second air supply duct 112 becomes one of the main factors affecting the temperature uniformity inside the freezer. In this embodiment, the impeller center 511 forms a first auxiliary connection line l1 and a second auxiliary connection line l2 with the first volute tongue 522 and the second volute tongue 524 respectively. The included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is set to be greater than 90° and less than 180°, so that the fan 5 can accurately control the air volume of the first air supply duct 111 and the second air supply duct 112 through the first fan outlet 53 and the second fan outlet 54 respectively, thereby achieving precise control of the air volume of the internal space, thereby improving the temperature uniformity of the freezer, improving the air cooling effect of the freezer, and reducing energy consumption.

[0157] In this embodiment of the disclosure, the included angle between the first auxiliary line l1 and the second auxiliary line l2 is set to be greater than 130° and less than or equal to 140°, and the included angle between the second auxiliary line l2 formed by the wind turbine center 511 and the second volute tongue 524 and a vertical line l3 is set to be greater than or equal to 20° and less than or equal to 40°.

[0158] Below, taking a 200L freezer as an example, assuming natural settling of cold air, and with an angle of 135° between the first auxiliary line l1 and the second auxiliary line l2, and an angle of 32° between the second auxiliary line formed by the impeller center 511 and the second volute tongue 524 and a vertical line l3, and in conjunction with the first air duct outlet 1113 set in the first air duct 111 and the second air duct outlet 1123 set in the second air duct 112, the temperature difference inside the freezer is reduced, improving the temperature uniformity, enhancing the cooling effect, and reducing energy consumption. See Tables 2 and 3 for details.

[0159] Table 2

[0160]

[0161] Table 3

[0162]

[0163] As can be seen from Table 2 above, when the angle between the first auxiliary line and the second auxiliary line is set to 135°, and the angle between the second auxiliary line formed by the impeller center 511 and the second volute tongue 524 and a vertical line is set to 32°, two tests were conducted under the same conditions, and the test results are shown in Examples 1 and 2, respectively. In Example 1, the wind speed ratios of the first air supply duct 111 and the second air supply duct 112 are 64.00% and 36.00%, respectively, and the final air supply volume is 1047.56 L / min. In Example 2, the wind speed ratios of the first air supply duct 111 and the second air supply duct 112 are 63.76% and 36.24%, respectively, and the final air supply volume is 1040.57 L / min. From the results of Examples 1 and 2, it can be seen that, considering the natural settling of cold air, the air supply velocity of the fan differs for the first air supply duct 111 and the second air supply duct 112. Furthermore, referring to Table 3, it can be seen that in Example 1, the lowest temperature inside the freezer liner 1 is -20.6℃ at the center of the bottom wall 13 of the liner 1, and the highest temperature is -19.3℃ at the top left front of the liner 1. Thus, the temperature difference between the highest and lowest temperatures inside the freezer liner 1 is 1.3℃. This data indicates that the temperature difference between different locations within the freezer liner 1 is very small. In other words, in this embodiment, by using different airflow velocities in the first air duct 111 and the second air duct 112, the temperature difference between different locations within the freezer is reduced, thus improving the temperature uniformity of the freezer.

[0164] It is understandable that when the angle between the first auxiliary line and the second auxiliary line is set to be greater than 90° and less than 180°, and the angle between the second auxiliary line formed by the impeller center 511 and the second volute tongue 524 and a vertical line is greater than or equal to 20° and less than or equal to 60°, the freezer can also obtain the same test results as in Embodiment 1 in terms of air volume and temperature difference, and thus achieve the same beneficial effect.

[0165] Optionally, the first air supply duct 111 includes a first diffuser section duct 1111 directly connected to the air outlet 53 of the first fan, and a first pressure stabilizing section duct 1112 connected to the first diffuser section duct 1111. The second air supply duct 112 includes a second diffuser section duct 1121 directly connected to the air outlet 54 of the second fan, and a second pressure stabilizing section duct 1122 connected to the second diffuser section duct 1121. The total area of ​​the air outlets 15 of the first pressure stabilizing section duct 1112 is larger than the area of ​​the air outlets 15 of the second pressure stabilizing section duct 1122.

[0166] By configuring the first air supply duct 111 as a first diffuser section duct 1111 directly connected to the first fan outlet 53 and a first pressure stabilizing section duct 1112 connected to the first diffuser section duct 1111, the airflow of refrigerant gas entering the internal space from the first air supply duct 111 can be made more stable. Similarly, configuring the second air supply duct 112 as a second diffuser section duct 1121 directly connected to the second fan outlet 54 and a second pressure stabilizing section duct 1122 connected to the second diffuser section duct 1121, the airflow of refrigerant gas entering the internal space from the second air supply duct 112 can be made more stable. Furthermore, since the first air supply duct 111 distributes a larger total amount of refrigerant gas, the total area of ​​the air outlets 15 of the first pressure stabilizing section duct 1112 is set to be larger than the area of ​​the air outlets 15 of the second pressure stabilizing section duct 1122, allowing the air outlets 15 of the first air supply duct 111 to enter the internal space more effectively.

[0167] Optionally, the first air supply duct 111 includes a first end air outlet 15 away from the fan 5, the second air supply duct 112 includes a second end air outlet 15 away from the fan 5, and the inner liner 1 includes an end sidewall close to the first and second end air outlets 15. The horizontal distance between the first end air outlet 15 and the end sidewall is the first end spacing, the horizontal distance between the second end air outlet 15 and the end sidewall is the second end spacing, and the first end spacing is less than the second end spacing.

[0168] By setting the first end spacing to be smaller than the second end spacing, that is, the horizontal distance between the first end air outlet 15 and the end side wall is smaller than the horizontal distance between the second end air outlet 15 and the end side wall, the air volume distribution of the second air outlet 15 of the second air duct 112 can be more uniform, thereby reducing the temperature difference at different locations within the internal space enclosed by the inner liner 1, and improving the temperature uniformity of the freezer.

[0169] Optionally, the difference between the first end spacing and the second end spacing is greater than or equal to the length of one air outlet 15 of the first air supply duct 111. Alternatively, the difference between the first end spacing and the second end spacing is greater than or equal to the length of one air outlet 15 of the second air supply duct 112.

[0170] With this configuration, the difference between the first end spacing and the second end spacing is set to be greater than or equal to the length of one air outlet 15 of the first air supply duct 111. Alternatively, the difference between the first end spacing and the second end spacing is set to be greater than or equal to the length of one air outlet 15 of the second air supply duct 112. This allows the second air supply duct 112 to shorten the length of one air outlet 15 of the first air supply duct 111 or the length of one air outlet 15 of the second air supply duct 112 relative to the first air supply duct 111, thereby making the air volume distribution of the second air outlet 15 of the second air supply duct 112 more uniform, thus reducing the temperature difference at different locations within the internal space enclosed by the inner liner 1, and improving the temperature uniformity of the freezer.

[0171] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A refrigerator characterized by, Comprise: a liner enclosing an interior space, the liner comprising a first side wall provided with a first air supply duct and a second air supply duct, the first air supply duct being provided at an upper portion of the first side wall, and the second air supply duct being provided at a lower portion of the first side wall; and a fan comprising a first fan air outlet in communication with the first air supply duct, and a second fan air outlet in communication with the second air supply duct, wherein the fan comprises a volute tongue assembly and a fan wheel disposed within the volute tongue assembly, wherein the volute tongue assembly comprises: a first volute and a first volute tongue enclosing a first fan air outlet; a second volute and a second volute tongue enclosing a second fan air outlet, a first auxiliary line formed between the center of the fan wheel and the first volute tongue, and a second auxiliary line formed between the center of the fan wheel and the second volute tongue, an included angle between the first auxiliary line and the second auxiliary line being greater than 100° and less than or equal to 140°, and an included angle between the second auxiliary line and a perpendicular line being greater than or equal to 20° and less than or equal to 60°.

2. The refrigerator according to claim 1, wherein the included angle between the second auxiliary line and the perpendicular line is less than or equal to 40°.

3. The refrigerator according to claim 1, wherein the included angle between the first auxiliary line and the second auxiliary line is greater than 130°.

4. The refrigerator according to claim 1, wherein the first air supply duct comprises a first pressure expansion section duct in direct communication with the first fan air outlet, and a first pressure stabilization section duct in communication with the first pressure expansion section duct; and the second air supply duct comprises a second pressure expansion section duct in direct communication with the second fan air outlet, and a second pressure stabilization section duct in communication with the second pressure expansion section duct, wherein a total area of air supply outlets of the first pressure stabilization section duct is greater than an area of air supply outlets of the second pressure stabilization section duct.

5. The refrigerator according to claim 1, wherein the first air supply duct comprises a first end air supply outlet away from the fan, the second air supply duct comprises a second end air supply outlet away from the fan, and the liner comprises an end side wall close to the first end air supply outlet and the second end air supply outlet, wherein a horizontal distance between the first end air supply outlet and the end side wall is a first end distance, a horizontal distance between the second end air supply outlet and the end side wall is a second end distance, and the first end distance is less than the second end distance.

6. The refrigerator according to claim 5, wherein a difference between the first end distance and the second end distance is greater than or equal to a length of one air supply outlet of the first air supply duct; or a difference between the first end distance and the second end distance is greater than or equal to a length of one air supply outlet of the second air supply duct.

7. The refrigerator according to any one of claims 1 to 6, characterized in that Further comprise: A return air cover is arranged in the inner space and divides the inner space into a storage cavity and an evaporator cavity. The evaporator cavity is connected to the inlet of the first and second air supply air ducts. The return air cover is provided with a return air opening. Air in the storage cavity can flow into the evaporator cavity through the return air opening. An evaporator is arranged in the evaporator cavity. And, A compressor is arranged in the lower part of the evaporator cavity.

8. The refrigerator according to claim 7, characterized in that Further comprising: A compressor cavity step is arranged upwardly from the bottom wall of the inner container and arranged in the lower part of the return air cover. The compressor cavity step and the bottom wall of the inner container together enclose a compressor cavity for placing the compressor.

9. The refrigerator according to claim 7, wherein The relationship between the total volume V of the evaporator and the total area S of the return air opening is: yS = V, wherein y is greater than or equal to 50 and less than or equal to 1000.

10. The refrigerator according to claim 9, wherein y is greater than or equal to 55 and less than or equal to 700.

Images