Freezer

Abstract

The present application relates to the technical field of refrigeration apparatuses, and discloses a freezer. The freezer comprises a liner, an air return cover plate and an evaporator. An inner space is defined by the liner, and an air supply channel having an air supply port is defined by the liner. The air return cover plate is located in the inner space and divides the inner space into a storage cavity and an evaporator cavity, an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return port, and airflow in the storage cavity can flow into the evaporator cavity through the air return port. The evaporator is located in the evaporator cavity. The relationship between the total volume V of the evaporator and the total area S of the air return port is yS=V, wherein y is greater than or equal to 50. Refrigeration requirements for the freezer can be met by setting the relationship between the total volume V of the evaporator and the total area S of the air return port to satisfy yS=V, wherein y is greater than or equal to 50. In this way, the air return port of the freezer can be configured more reasonably, such that the freezer can conduct effective refrigeration, and the actual refrigeration requirements are met.

Description

[0001] This application claims priority to Chinese Patent Application No. 202310197964.9, filed on March 3, 2023, Chinese Patent Application No. 202320380409.5, filed on March 3, 2023, Chinese Patent Application No. 202320391413.1, filed on March 3, 2023, Chinese Patent Application No. 202310203157.3, filed on March 3, 2023, Chinese Patent Application No. 202320385124.0, filed on March 3, 2023, and Chinese Patent Application No. 202310199918.2, filed on March 3, 2023. The contents of which are incorporated herein by reference in their entirety.TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of refrigeration, and more particularly to a freezer.BACKGROUND

[0003] At present, refrigeration devices are widely applied for storing goods at a low temperature, for example, refrigerators, freezers, and the like. According to the refrigeration principle, the freezer is generally divided into a direct-cooled freezer and an air-cooled freezer. The direct-cooled freezer is easy to frost inside the cabinet, while the air-cooled freezer is favored by users for the advantage of being frost-free.SUMMARY

[0004] A brief summary is given below to give a basic understanding of some aspects of the disclosed embodiments. The summary is not intended to be a general comment to identify crucial / essential constituent elements or to describe the protection scope of these embodiments, but rather to serve as a preface to the detailed description that follows.

[0005] The embodiment of the present disclosure provides a freezer, the air return inlet of the freezer is designed more reasonably, and the refrigeration of the freezer is effective, meeting the actual refrigeration requirements.

[0006] In some embodiments, a freezer comprises a liner, an air return cover plate, and an evaporator. The liner encloses an interior space, and the liner defines an air supply channel having an air supply outlet. The air return cover plate is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and an outlet of the evaporator cavity is communicated with an inlet of the air supply channel. The air return cover plate is provided with an air return inlet, and airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. The evaporator is located in the evaporator cavity. A relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as yS=V, where y is greater than or equal to 50. Optionally, y is less than or equal to 1000. Optionally, y is greater than or equal to 55 and less than or equal to 700.

[0007] Optionally, the air return cover plate comprises a first cover plate portion and a second cover plate portion. The first cover plate portion is disposed along a horizontal direction. The second cover plate portion is disposed along a vertical direction and connected to the first cover plate portion. At least one of the first cover plate portion and the second cover plate portion is provided with the air return inlet.

[0008] Optionally, the freezer further comprises a compressor cavity step. The compressor cavity step is protruded upward from a bottom wall of the liner, comprising a vertical step plate disposed along a vertical direction and a horizontal step plate disposed along a horizontal direction, where the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor. The vertical step plate is connected to the second cover plate portion of the air return cover plate, and an air return inlet connecting to the evaporator cavity is disposed on at least part of the vertical step plate connected to the second cover plate portion. The total area S of the air return inlets is a sum of the areas of all air return inlets.

[0009] Optionally, the air return cover plate is disposed at the upper portion of the compressor cavity step.

[0010] Optionally, the evaporator comprises a first evaporator and a second evaporator. The first evaporator is disposed at one end of the evaporator cavity, and an included angle between the first evaporator and the horizontal direction is less than or equal to a first angle. The second evaporator is disposed at the other end of the evaporator cavity, and an included angle between the second evaporator and the horizontal direction is less than or equal to the first angle. The total volume V of the evaporators is a sum of the volumes of the first evaporator and the second evaporator.

[0011] Optionally, the evaporator cavity comprises an air return cavity between the first evaporator and the second evaporator, the first cover plate portion is provided with a first air return inlet at a top of the air return cavity, and the second cover plate portion is provided with a second air return inlet at the side of the air return cavity. An area of the first air return inlet is greater than or equal to an area of the second air return inlet.

[0012] Optionally, the first air return inlet comprises a plurality of first air return portions disposed side by side. A width of the first air return portion is less than or equal to a first width threshold, and / or, a length of the first air return portion is greater than or equal to a first length threshold.

[0013] Optionally, the liner comprises a first sidewall, and the first sidewall defines an air supply channel with the air supply outlet. The air supply channel is internally provided with a fan.

[0014] The embodiment of the present disclosure provides a freezer, at least part of the communicating pipe is disposed in a foaming layer of the evaporator cavity, avoiding the whole communicating pipe from frost affecting the heat exchange of the communicating evaporator, and improving the refrigeration effect of the freezer.

[0015] In some embodiments, the freezer comprises a liner, an air return cover plate, and an evaporator group. The liner encloses an interior space, and the liner defines an air supply channel with an air supply outlet. The air return cover plate is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and an outlet of the evaporator cavity is communicated with an inlet of the air supply channel. The air return cover plate is provided with an air return inlet, and airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. An evaporator group comprises a first evaporator, a second evaporator, and a communicating pipe communicating with the first evaporator and the second evaporator. A foaming layer is disposed at an inner side of the evaporator cavity, and at least part of the communicating pipe is disposed in the foaming layer.

[0016] Optionally, the foaming layer at least comprises a bottom foaming layer disposed at a bottom of the evaporator group. At least part of the communicating pipe is disposed in the bottom foaming layer.

[0017] Optionally, the first evaporator and the second evaporator are communicated in series or parallel.

[0018] Optionally, the liner comprises a first sidewall, the first sidewall defines a first sidewall air supply channel with the air supply outlet, where the first sidewall air supply channel is internally provided with a first fan, a first inlet, and a first outlet of the first evaporator are disposed at a side close to the first fan. And / or, the liner comprises a second sidewall, the second sidewall defines a second sidewall air supply channel with the air supply outlet, where the second sidewall air supply channel is internally provided with a second fan, a second inlet, and a second outlet of the first evaporator are disposed at a side close to the second fan.

[0019] Optionally, the communicating pipe is disposed below the first inlet and the first outlet of the first evaporator. And / or, the communicating pipe is disposed below the second inlet and the second outlet of the second evaporator.

[0020] Optionally, the first evaporator comprises a first heat exchanger pipe group and a first heating pipe group, and at least part of the first heating pipe group is disposed below the first heat exchanger pipe group. And / or, the second evaporator comprises a second heat exchanger pipe group and a second heating pipe group, and at least part of the second heating pipe group is disposed below the second heat exchanger pipe group.

[0021] Optionally, the freezer further comprises a compressor cavity step. The compressor cavity step is protruded upward from a bottom wall of the liner, disposed at a low portion of the air return cover plate, and the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor.

[0022] Optionally, a relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as yS=V, where y is greater than or equal to 50. Optionally, y is less than or equal to 1000. Optionally, y is greater than or equal to 55 and less than or equal to 700.

[0023] The embodiment of the present disclosure provided with a freezer, the distance between at least the portion of the communicating pipe and the heat conducting fin group is less than or equal to the heat conducting distance, so as to avoid the whole communicating pipe from frosting or to defrost the communicating pipe as soon as possible after frosting, improving the heat exchange efficiency of the evaporator, and improving the refrigeration effect of the freezer.

[0024] In some embodiments, the freezer comprises a liner, an air return cover plate, and an evaporator group. The liner encloses an interior space, and the liner defines an air supply channel with an air supply outlet. The air return cover plate is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate is provided with an air return inlet, and airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. An evaporator group, comprising a first evaporator, a second evaporator, and a communicating pipe communicating with the first evaporator and the second evaporator. the evaporator group comprises a heat conducting fin group and a heat exchanger pipe group through the heat conducting fin group, and a distance between at least part of the communicating pipe and the heat conducting fin group is less than or equal to a heat conducting distance.

[0025] Optionally, the heat conducting distance is less than or equal to 10 mm.

[0026] Optionally, the evaporator cavity comprises an air return cavity located between the first evaporator and the second evaporator. At least part of the communicating pipe is disposed in the air return cavity.

[0027] Optionally, the first evaporator group comprises a first heat conducting fin group, the communicating pipe comprises a first bend pipe section, a distance between the first bend pipe section and the first heat conducting fin group is less than or equal to the heat conducting distance. And / or, the second evaporator group comprises a second heat conducting fin group, the communicating pipe comprises a second bend pipe section, a distance between the second bend pipe section and the second heat conducting fin group is less than or equal to the heat conducting distance.

[0028] Optionally, a first inlet and a first outlet of the first evaporator are disposed facing a side of the air return cavity. And / or, a second inlet and a second outlet of the first evaporator are disposed facing a side of the air return cavity.

[0029] Optionally, the freezer further comprises a compressor. The compressor is disposed at a lower portion of the evaporator group.

[0030] The embodiment of the present disclosure provides a freezer, the distance between the evaporators is more reasonable, and the refrigeration of the freezer is effective, meeting the actual refrigeration requirement.

[0031] In some embodiments, the freezer comprises a liner, an air return cover plate, and an evaporator group. The liner encloses an interior space, and the liner defines the air supply channel with the air supply outlet. The air return cover plate, located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate is provided with an air return inlet, and airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. The evaporator group comprises a first evaporator and a second evaporator disposed inside the evaporator cavity, where the evaporator cavity comprises an air return cavity disposed between the first evaporator and the second evaporator, and a distance L between the first evaporator and the second evaporator satisfies the relationship of L≥S / (a'+c'), where S is the total area of the air return inlet, a' and c' are lengths of two different positions of the air return cavity or the first evaporator, respectively, and at least one of the two different positions is close to the air return inlet.

[0032] Optionally, the air return cover plate comprises a first cover plate portion disposed along a horizontal direction, and the first cover plate portion is provided with a first air return inlet at a top of the air return cavity, where a' is a length of a position close to the first air return inlet in the air return cavity, a' is greater than or equal to the length of the first air return inlet, and less than or equal to a total length of the first cover plate portion along a length direction of the first air return inlet.

[0033] Optionally, the first evaporator comprises a first edge, the first edge is close to the first air return inlet and has a first length a. The length of a' is equal to the first length a of the first edge.

[0034] Optionally, the air return cover plate further comprises a second cover plate disposed along a vertical direction, and the second cover plate portion is provided with a second air return inlet at the side of the air return cavity. c' is a length of a position close to the second air return inlet in the air return cavity, c' is greater than or equal to the length of the second air return inlet, and less than or equal to a total length of the second cover plate portion along a length direction of the second air return inlet.

[0035] Optionally, the first evaporator comprises a second edge, the second edge is close to the second air return inlet, and has a second length c. A length of c' is equal to the second length c of the second edge.

[0036] Optionally, an included angle between the first evaporator and the horizontal direction is less than or equal to a first angle. And / or, an included angle between the second evaporator and the horizontal direction is less than or equal to the first angle.

[0037] Optionally, a relationship between a total volume V of the evaporator group and a total area S of the air return inlet is defined as yS=V, where y is greater than or equal to 50. Optionally, y is less than or equal to 1000.

[0038] The embodiment of the present disclosure provides a freezer, and a horizontal thermal insulation spacing distance is provided between the evaporator and the side cover plate portion for evaporator insulation, avoiding the loss of refrigeration capacity from the evaporator, ensuring the heat exchange effect between the airflow of the freezer and the evaporator, and improving the refrigeration effect.

[0039] In some embodiments, a freezer comprises a liner, an air return cover plate, an evaporator, and a compressor. The liner encloses the interior space, and the liner defines the air supply channel with the air supply outlet. The air return cover plate is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity provided with the evaporator, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate is provided with the air return inlet, and the airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. The compressor is disposed at a lower portion of the evaporator. The air return cover plate comprises a side cover plate portion, and a horizontal thermal insulation spacing distance m is provided between the evaporator and the side cover plate portion.

[0040] Optionally, the horizontal thermal insulation spacing distance m is greater than or equal to 2 mm, and / or, the horizontal thermal insulation spacing distance m is less than or equal to 50 mm.

[0041] Optionally, the air return cover plate comprises the first cover plate portion disposed along the horizontal direction. A vertical thermal insulation spacing distance n is provided between the evaporator and the first cover plate portion.

[0042] Optionally, the vertical thermal insulation spacing distance n is greater than or equal to 2 mm, and / or, the vertical thermal insulation spacing distance n is less than or equal to 50 mm.

[0043] Optionally, an insulation material is filled at the horizontal thermal insulation spacing distance m. And / or, an insulation material is filled in the vertical thermal insulation.

[0044] Optionally, the liner comprises a first sidewall, and the first sidewall defines an air supply channel with the air supply outlet. The air supply channel is internally provided with a fan.

[0045] Optionally, a volute casing depth g of the fan is larger than or equal to 50 mm. And / or, the volute casing depth g of the fan is less than or equal to 150 mm.

[0046] Optionally, a distance h between an outer side of the volute casing of the fan and the evaporator is greater than or equal to 10 mm. And / or, the distance h between the outer side of the volute casing of the fan and the evaporator is less than or equal to 200 mm.

[0047] Optionally, the freezer further comprises a compressor cavity step. The compressor cavity step is protruded upward from the bottom wall of the liner, and is disposed at the lower portion of the air return cover plate, where the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor.

[0048] The embodiment of the present disclosure provides a fan and a freezer to reduce the temperature difference between different positions, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption.

[0049] In some embodiments, the fan comprises a volute casing-volute tongue assembly, and a wind wheel disposed inside the volute casing-volute tongue assembly. the volute casing-volute tongue assembly comprises a first volute casing and a first volute tongue, and a second volute casing and a second volute tongue. The first volute casing and the first volute tongue enclose to form a first fan outlet. The second volute casing and the second volute tongue enclose to form a second fan outlet. a wind wheel center and the first volute tongue are formed a first auxiliary connection line, the wind wheel center and the second volute tongue are formed a second auxiliary connection line, and an included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°.

[0050] Optionally, the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 100° and less than or equal to 140°. Or, the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 130° and less than or equal to 140°. Or, the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 170° and less than or equal to 180°.

[0051] In some embodiments, a freezer comprises a liner and a fan. The liner encloses an interior space, the liner comprises a first sidewall, the first sidewall is provided with a first air supply channel and a second air supply channel, and a fan, comprising a first fan outlet communicating with the first air supply channel, and a second fan outlet communicating with the second air supply channel, where the fan is the above fan.

[0052] Optionally, the first air supply channel is disposed at an upper portion of the first sidewall, and the second air supply channel is disposed at a lower portion of the first sidewall. An included angle between the second auxiliary connection line and a perpendicular line is greater than or equal to 20° and less than or equal to 60°; or, the included angle between the second auxiliary connection line and the perpendicular line is greater than or equal to 20° and less than or equal to 40°, where the second auxiliary connection line is formed by the wind wheel center and the second volute tongue.

[0053] Optionally, the first air supply channel comprises a first pressure expanding section air channel directly communicating with the first fan outlet, and a first pressure stabilizing section air channel communicating with the first pressure expanding section air channel. The second air supply channel comprises a second pressure expanding section air channel directly communicating with the second fan outlet, and a second pressure stabilizing section air channel communicating with the second pressure expanding section air channel. a total area of the air supply outlet of the first pressure stabilizing section air channel is greater than a total area of the air supply outlet of the second pressure stabilizing section air channel.

[0054] Optionally, the first air supply channel comprises a first end air supply outlet away from the fan, the second air supply channel comprises a second end air supply outlet away from the fan, and the liner comprises an end sidewall close to the first end air supply outlet and the second end air supply outlet. A first end spacing distance is a horizontal distance between the first end air supply outlet and the end sidewall, the second end spacing distance is a horizontal distance between the second end air supply outlet and the end sidewall, and the first end spacing distance is less than the second end spacing distance.

[0055] Optionally, the difference between the first end spacing distance and the second end spacing distance is greater than or equal to a length of an air supply outlet of the first air supply channel. Or, the difference between the first end spacing distance and the second end spacing distance is greater than or equal to a length of an air supply outlet of the second air supply channel.

[0056] Optionally, the freezer further comprises an air return cover plate, an evaporator, and a compressor. The air return cover plate is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlets of the first air supply channel and the second air supply channel. The air return cover plate is provided with an air return inlet, and airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet. An evaporator, disposed in the evaporator cavity. And, the compressor, disposed at a lower portion of the evaporator.

[0057] The freezer provided by the embodiment of the present disclosure can realize the following technical advantages:

[0058] The freezer provided by the embodiment of the present disclosure comprises the liner, the air return cover plate, and the evaporator. The liner defines the air supply channel with the air supply outlet, and refrigeration airflow is capable of being provided in the interior space enclosed by the liner to reduce the temperature of the interior space. The air return cover plate is provided with the air return inlet, when the freezer operates, after airflow inside the evaporator cavity flows through the evaporator and the temperature of the airflow reduced, under the driving of the fan, the airflow flows to air supply channel, then flows to the storage cavity through the air supply outlet, after refrigerating the goods inside the storage cavity, the airflow flows back to the evaporator cavity through the air return inlet. The relationship between the total volume V of the evaporator and the total area S of the air return inlet is defined as yS=V. In a case where y is greater than or equal to 50, the refrigeration requirement of the freezer can be met. Thus, the air return inlet of the freezer can be configured with more choices, and the refrigeration of the freezer is effective, meeting the actual refrigeration requirement.

[0059] The freezer provided by the embodiment of the present disclosure comprises the liner, the air return cover plate, and the evaporator group. The evaporator group comprises the first evaporator and the second evaporator, and the communicating pipe communicating with the first evaporator and the second evaporator, thus providing two communicating evaporators can improve the refrigeration efficiency of the freezer. At least part of the communicating pipe is disposed in the foaming layer of the evaporator cavity, avoiding the whole communicating pipe from frost affecting the heat exchange of the communicating evaporator, and improving the refrigeration effect of the freezer.

[0060] The freezer provided by the embodiment of the present disclosure comprises the liner, the air return cover plate, and the evaporator group. The evaporator group comprises the first evaporator and the second evaporator disposed in the evaporator cavity, and the communicating pipe communicating with the first evaporator and the second evaporator, thus providing two communicating evaporators can improve the refrigeration efficiency of the freezer. The distance between at least part of the communicating pipe and the heat conducting fin group is less than or equal to the heat conducting distance, so as to avoid the whole communicating pipe from frosting or to defrost the communicating pipe as soon as possible after frosting, improving the heat exchange efficiency of the evaporator, and improving the refrigeration effect of the freezer.

[0061] The freezer provided by the embodiment of the present disclosure comprises the liner, the air return cover plate, and the evaporator group. The evaporator group comprises the first evaporator and the second evaporator disposed inside the evaporator cavity, and the evaporator cavity comprises the air return cavity disposed between the first evaporator and the second evaporator. Airflow inside the freezer flows to the first evaporator and the second evaporator, respectively, after flows back to the air return cavity through the air return inlet, avoiding interference of the airflow flowing to the two evaporators. By providing the distance of the first evaporator and the second evaporator L is satisfied the relationship of L≥S / (a'+c'), where S is the total area of the air return inlet, a' and c' are lengths of two different positions of the air return cavity or the first evaporator, respectively, and at least one of the two different positions is close to the air return inlet. Thus, the distance between evaporators is more reasonable, and the refrigeration of the freezer is effective, meeting the actual refrigeration requirement.

[0062] The freezer provided by the embodiment of the present disclosure comprises the liner, the air return cover plate, the evaporator, and the compressor. The air return cover plate comprises the side cover plate portion, the horizontal thermal insulation spacing distance m is provided between the evaporator and the side cover plate portion for evaporator insulation, avoiding the loss of refrigeration capacity from the evaporator, and ensuring the heat exchange effect between the airflow of the freezer and the evaporator, and improving the refrigeration effect.

[0063] The freezer provided by the embodiment of the present disclosure comprises the liner and the fan. The liner encloses the interior space, the first sidewall of the liner is provided with the first air supply channel and the second air supply channel, and refrigeration airflow can be provided in the interior space enclosed by the liner to reduce the temperature of the interior space. The fan comprises the volute casing-volute tongue assembly, and the wind wheel disposed inside the volute casing-volute tongue assembly. In the volute casing-volute tongue assembly, the first volute casing and the first volute tongue enclose to form the first fan outlet, and the second volute casing and the second volute tongue enclose to form the second fan outlet. And, the first air supply channel and the second air supply channel of the first sidewall of the liner are communicated with the first fan outlet and the second fan outlet, respectively. Driven by the fan, refrigeration airflow flows into the interior space enclosed by the liner through the first air supply channel and the second air supply channel to reduce the temperature of the interior space. The wind wheel center and the first volute tongue form the first auxiliary connection line, and the wind wheel center and the second volute tongue form the second auxiliary connection line. The included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°, so that the air supply volume of different air channels can be accurately controlled by the fan, and cooperated with the first air supply channel and the second air supply channel, realizing accurately control of the air supply volume of the interior space, reducing the temperature difference between different positions, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption.

[0064] The above general description and the description below are exemplary and explanatory only and are not intended to limit the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0065] One or more embodiments are illustrated by means of the corresponding drawings, which do not constitute a limitation of the embodiments. The elements having the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a limitation of proportion, where: Fig. 1 is a schematic structure diagram of a freezer provided by the embodiment of the present disclosure; Fig. 2 is a schematic structure diagram of a liner cooperating with an air return cover plate provided by the embodiment of the present disclosure; Fig. 3 is a schematic structure diagram of the liner cooperating with an evaporator group provided by the embodiment of the present disclosure; Fig. 4 is a sectional schematic structure diagram of the liner cooperating with the evaporator group provided by the embodiment of the present disclosure; Fig. 5 is a schematic structure diagram of the air return cover plate cooperating with the evaporator group provided by the embodiment of the present disclosure; Fig. 6 is another schematic structure diagram of the air return cover plate cooperating with the evaporator group provided by the embodiment of the present disclosure; Fig. 7 is a schematic structure diagram of the position relationship of two evaporators provided by the embodiment of the present disclosure; Fig. 8 is a schematic structure diagram of two evaporators in cooperation provided by the embodiment of the present disclosure; Fig. 9 is another schematic structure diagram of the air return cover plate cooperating with the evaporator group provided by the embodiment of the present disclosure; Fig. 10 is a schematic structure diagram of a fan cooperating with an air supply channel provided by the embodiment of the present disclosure; Fig. 11 is a schematic structure diagram of the fan provided by the embodiment of the present disclosure; and Fig. 12 is another schematic structure diagram of the fan provided by the embodiment of the present disclosure. REFERENCES IN THE DRAWINGS:

[0066] 1: liner; 11: first sidewall; 111: first air supply channel; 1111: first pressure expanding section air channel; 1112: first pressure stabilizing section air channel; 1113: first air channel outlet; 112: second air supply channel; 1121: second pressure expanding section air channel; 1122: second pressure stabilizing section air channel; 1123: second air channel outlet; 12: second sidewall; 13: bottom wall; 14: compressor cavity step; 15: air supply outlet; 2: air return cover plate; 21: first cover plate portion; 211: first air return inlet; 2111: first air return portion; 2112: air return guiding plate; 22: second cover plate portion; 221: second air return inlet; 3: evaporator group; 31: first evaporator; 311: first edge; 312: second edge; 313: third edge; 314: first heat exchanger pipe group; 315: first heating pipe group; 316: first heat conducting fin group; 32: second evaporator; 321: second heat exchanger pipe group; 322: second heating pipe group; 323: second heat conducting fin group; 33: communicating pipe; 331: first bend pipe section; 332: second bend pipe section; 4: compressor; 5: fan; 51: wind wheel; 511: wind wheel center; 52: volute casing-volute tongue assembly; 521: first volute casing; 522: first volute tongue; 523: second volute casing; 524: second volute tongue; 53: first fan outlet; 54: second fan outlet; 6: cabinet shell; 7: door body; a: length of the first edge; c: length of the second edge; L: distance between the first evaporator and the second evaporator; m: horizontal thermal insulation spacing distance; n: vertical thermal insulation spacing distance; g: fan volute casing depth; h: distance between the outside of the fan volute casing and the evaporator; S1: area of the first air return inlet; S2: area of the second air return inlet; S: total area of the air return inlet; V: total volume of the evaporator group; l1: first auxiliary connection line; l2: first auxiliary connection line; l3: perpendicular line; d1: first end spacing distance; d2: second end spacing distance. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings, which are for illustration only and are not intended to limit the embodiments of the present disclosure. In the following technical description for the convenience of explanation, several details are provided for a full understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, the well-known structures and devices may simplify the disclosure in order to simplify the drawings.

[0068] The terms "first", "second", and the like in the specification and claims of embodiments of the present disclosure and the above drawings are used to distinguish similar elements and are not necessarily used to describe a particular order or priority. It should be understood that the data used in this way can be interchanged where appropriate for the present disclosure described herein. Furthermore, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion.

[0069] In embodiments of the present disclosure, directional or positional relationships indicated by terms such as "up", "down", "inside", "middle", "outside", "front", and "rear" are based on the directional or positional relationship shown in the figures. These terms are mainly intended to describe embodiments of the present disclosure, not to limit the described devices, elements, or components must having a specific orientation or must being configured and operated in a specific orientation. Furthermore, in addition to indicating the directional or positional relationship, the above partial terms might also be used to convey other meanings. For example, the term "on" might also be used to indicate a dependency relationship or a connectional relationship in some cases. Those having ordinary skills in the art may understand specific meanings of these terms in the embodiments of the present disclosure according to specific situations.

[0070] In addition, the terms "dispose", "connect", and "fix" should be understood in a broad sense. For example, "connect" may be a fixed connection, detachable connection, or integral connection, maybe a mechanical connection or electrical connection, maybe a direct connection, an indirect connection through an intermediate medium, or maybe internal communication between two devices, elements, or components. Those having ordinary skills in the art may understand specific meanings of the above terms in the embodiments of the present disclosure according to specific situations.

[0071] Unless otherwise illustrated, the term "a plurality of" means two or more.

[0072] The term "and / or" is an association relationship that describes elements, indicating that there can be three relationships. For example, A and / or B represent relationships: A or B, or A and B.

[0073] Embodiments of the present disclosure and features in the embodiments may be combined with one another without conflict.

[0074] As shown in Figs. 1 to 9, the embodiment of the present disclosure provides a freezer, particularly an air-cooled freezer, and specifically an air-cooled horizontal freezer. The freezer comprises a cabinet and a door body 7, and the door body 7 is movable and located on the cabinet. The cabinet comprises a cabinet shell 6, a liner 1, and insulation material. The liner 1 is located inside the cabinet shell 6, and the insulation material is located between the cabinet shell 6 and the liner 1.

[0075] The liner 1 comprises a bottom wall 13 and sidewalls, and the sidewalls comprise a front sidewall, a rear sidewall, a left sidewall, and a right sidewall. The front sidewall is disposed opposite to the rear sidewall. The front sidewall and the rear sidewall are located at the front end and the rear end of the bottom wall 13, respectively, and extend upward. The left sidewall is disposed opposite to the right sidewall. The left sidewall and the right sidewall are located at the left end and the right end of the bottom wall 13, respectively, and extend upward. The bottom wall 13, the front sidewall, the rear sidewall, the left sidewall, and the right sidewall enclose together to form an interior space. The interior space has an opening, the opening faces upward, and the door body 7 is movable and covered above the opening.

[0076] For convenience of description, the present disclosure defines a front-rear direction as a width direction and a left-right direction as a length direction.

[0077] The embodiment of the present disclosure provides the freezer, the liner 1 comprises a first sidewall 11 and a second sidewall 12, the first sidewall 11 and the second sidewall 12 are disposed along the width direction of the liner 1, and each of the first sidewall 11 and the second sidewall 12 defines an air supply channel with an air supply outlet 15. The first sidewall 11 and the second sidewall 12 are disposed along the width direction of the liner 1, that is, the first sidewall 11 can be the rear sidewall or the front sidewall; correspondingly, the second sidewall 12 can be the front sidewall or the rear sidewall. It should be understood that both the front sidewall and the rear sidewall define the air supply channel with the air supply outlet 15. Therefore, the air supply from the interior space is realized to provide the air-cooled.

[0078] The freezer further comprises an air return cover plate 2. The air return cover plate 2 is located in the interior space and divides the interior space into a storage cavity and an evaporator cavity, and an outlet of the evaporator cavity is communicated with an inlet of the air supply channel. The air return cover plate 2 is provided with an air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The storage cavity is for holding goods that need to be frozen, for example, meat, seafood, tea, or the like. The evaporator cavity is for generating refrigerating airflow. The refrigerating airflow can flow from the evaporator cavity to the air supply channel and flow into the storage cavity from the air supply outlet 15. After exchanging heat with the goods inside the storage cavity, the refrigerating airflow flows back to the evaporator cavity for recooling, and the cooled airflow flows to the air supply channel for circulation. Thus, the air circulation of the freezer is realized, and the air-cooled refrigeration of the freezer is realized.

[0079] It should be noted that the air return cover plate 2 can be a variety of shapes, for example, L-shaped, inclined shape, and the like. The evaporator cavity can also be a variety of shapes, and located at different positions in the interior space. For example, the evaporator cavity can be located at the left end, the middle, or the right end of the interior space. In actual application, the evaporator cavity and the storage cavity can be arranged according to the structure of the interior space of the freezer.

[0080] The freezer further comprises an evaporator and a fan 5. The evaporator is located in the evaporator cavity. Optionally, the fan 5 and the air supply channel are located inside the same sidewall, and the fan 5 and the air supply channel are in communication. The fan 5 can drive airflow to flow through the evaporator cavity, the air supply channel, and the storage cavity, then flow back into the evaporator cavity through the air return inlet, forming an air circulation path. The evaporator is for exchanging heat with airflow inside the evaporator cavity to form refrigerating airflow. The fan 5 provides power for the flow of the airflow. Both the fan 5 and the air supply channel are located on the same sidewall. Thus, airflow flows from the fan 5 into the air supply channel without passing through a right angle, reducing the loss of the airflow, improving the refrigeration effect of the freezer, and reducing energy consumption.

[0081] In some embodiments, the freezer comprises the liner 1, the air return cover plate 2, and the evaporator. The liner 1 encloses the interior space, and the liner 1 defines the air supply channel with the air supply outlet 15. The air return cover plate 2 is located in the interior space and divides the interior space into the storage cavity and the evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate 2 is provided with the air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The evaporator is located in the evaporator cavity. A relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as yS=V, where y is greater than or equal to 50.

[0082] As shown in Fig. 9, taking two air return inlets for example, a total volume of the two evaporators is defined as V, an area of the first air return inlet 211 is defined as S1, an area of the second air return inlet 221 is defined as S2, and the total area S of the two evaporators is defined as a sum of the area of the first air return inlet 211 and the area of the second air return inlet 221.

[0083] Optionally, y is less than or equal to 1000.

[0084] Thus, according to an actual refrigeration temperature requirement, under the premise that the relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as yS=V, where y is greater than or equal to 50, y is less than or equal to 1000 to meet the actual refrigeration requirement for user to utilize the freezer.

[0085] The air return cover plate 2 is provided with the air return inlet, when the freezer operates, after airflow inside the evaporator cavity flows through the evaporator and the temperature of the airflow reduced, under the driving of the fan 5, the airflow flows into air supply channel, then flows to the storage cavity through the air supply outlet 15, after refrigerating the goods inside the storage cavity, the airflow flows back to the evaporator cavity through the air return inlet, thus forming the air circulation path of the freezer. During the air circulation process, in a case where the air pressure is constant, and the width of the air supply channel and the area of the air supply outlet 15 are sufficiently large, the size or the area of the air return inlet is one of the main factors affecting the air supply volume in the process of the air circulation. In the embodiment of the present disclosure, 50≤y≤1000, improving the air supply volume of the air supply outlet 15 in the air circulation path of the freezer.

[0086] It should be understood that a unit of the total volume of the evaporator V is mm 3< , that is, cubic millimeters, and a unit of the total area of the air return inlet S is mm 2< , that is, square millimeters. In this measurement unit, the value of y is obtained by calculation, and y can be a constant without units.

[0087] Optionally, y is greater than or equal to 55 and less than or equal to 700.

[0088] In the embodiment of the present disclosure, 55≤y≤700, improving the cooling speed and refrigerating depth of the freezer. Taking one evaporator inside the evaporator cavity as an example to describe. Table 1Embodi mentEvaporator size - mm 3< Total area of air return inlet - mm 2< yCooling speed - minRefrigera tion depth - °CPower consumption - kW·h / 24hEnergy efficiency level1196×180×100707415097-24.91.48Level 32196×180×100626895683-25.41.35Level 23196×180×1001634821690-291.03Level 14196×180×10013257266121-27.61.14Level 15196×180×1006143574163-26.81.29Level 26196×180×1003580985201-23.11.53Level 3

[0089] As can be seen from Table 1 above, in a case where the length, width, and height of the evaporator are 196 mm, 180 mm, and 100 mm, respectively, and the volume of the evaporator is calculated to be 3528000 mm 3< . According to the formula yS=V, different values of y are obtained by calculating the total area of different air return inlets.

[0090] In Table 1, the value of y in Embodiment 1 is 50, the value of y in Embodiment 2 is 56, the value of y in Embodiment 3 is 216, the value of y in Embodiment 4 is 266, the value of y in Embodiment 5 is 574, and the value of y in Embodiment 6 is 985. The energy efficiency rate of Embodiment 3 and Embodiment 4 is level 1, and the energy efficiency rate of Embodiment 2 and Embodiment 5 is level 2, significantly higher than Embodiment 1 and Embodiment 6 in level 3. That is, in a case where 55≤y≤700, the freezer can in a better energy efficiency level. Optionally, 100≤y≤500.

[0091] According to the parameter of cooling speed, the cooling speed of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4 is 97 min, 83 min, 90 min, and 121 min, respectively, significantly faster than the cooling speed of Embodiment 5 and Embodiment 6. Furthermore, according to the parameter of refrigeration depth, the refrigeration depth of embodiment 3 and embodiment 4 is -29°C, -27.6°C, respectively, significantly lower than the refrigeration depth of embodiment 1, embodiment 2, embodiment 5, and embodiment 6. The cooling speed refers to the time from environmental temperature drops to -18°C inside the freezer, and the refrigeration depth refers to the lowest temperature that the freezer can reach. Furthermore, according to the parameter of power consumption, the power consumption of Embodiment 3 and Embodiment 4 is 1.03kW·h / 24h and 1.14kW·h / 24h, respectively, significantly lower than the power consumption of Embodiment 1, Embodiment 2, Embodiment 5, and Embodiment 6. Optionally, 100≤y≤500.

[0092] Considering three test parameters of cooling speed, refrigeration depth, and power consumption, the value of y in Embodiment 3 and Embodiment 4 is 216 and 266, respectively. The freezer is in a lower cooling depth and a less power consumption based on ensuring a certain cooling speed, and the energy efficiency rate belongs to level 1. Significantly better than Embodiment 1, Embodiment 2, Embodiment 5, and Embodiment 6.

[0093] It should be understood that in a case where the value of y is other values that are greater than or equal to 100 and less than or equal to 500, the freezer can also reach the same energy efficiency effect as Embodiment 3 or Embodiment 4.

[0094] Optionally, the air return cover plate 2 comprises a first cover plate portion 21 and a second cover plate portion 22. The first cover plate portion 21 is disposed along the horizontal direction. The second cover plate portion 22 is disposed along the vertical direction and connected to the first cover plate portion 21. At least one of the first cover plate portion 21 and the second cover plate portion 22 is provided with the air return inlet.

[0095] As shown in Figs. 2 and 5, the air return cover plate 2 comprises the first cover plate portion 21 disposed along the horizontal direction and the second cover plate portion 22 disposed along the vertical direction, and the first cover plate portion 21 and the second cover plate portion 22 are connected. The first cover plate portion 21 and the second cover plate portion 22 can be detachably connected or non-detachably connected. Furthermore, at least one of the first cover plate portion 21 and the second cover plate portion 22 is provided with the air return inlet, so that when the freezer operates, airflow in the freezer is circulated.

[0096] It should be understood that the air return cover plate 2 is provided with one or more air return inlets. For example, in a case where the number of the air return inlet is one, the air return inlet is disposed in the first cover plate portion 21, or the air return inlet is disposed in the second cover plate portion 22. In a case where a plurality of the air return inlets are provided, the air return inlets can be disposed only in the first cover plate portion 21 or only in the second cover plate portion 22, or a part of the air return inlets are disposed in the first cover plate portion 21 and the other part of the air return inlets are disposed in the second cover plate portion 22.

[0097] Optionally, the freezer further comprises a compressor cavity step 14. The compressor cavity step 14 is protruded upward from the bottom wall 13 of the liner 1, comprising a vertical step plate disposed along the vertical direction and a horizontal step plate disposed along the horizontal direction. The compressor cavity step 14 and the bottom wall 13 of the liner 1 enclose together to form a compressor cavity for placing the compressor 4. The vertical step plate is connected to the second cover plate portion 22 of the air return cover plate 2, and an air return inlet connecting to the evaporator cavity is disposed on at least part of the vertical step plate connected to the second cover plate portion 22. The total area S of the air return inlets is the sum of the areas of all air return inlets.

[0098] The freezer needs to place the compressor 4, a condenser, and other assemblies, therefore the compressor cavity step 14 protruded upward from the bottom wall 13 of the liner 1, and comprises the vertical step plate disposed along vertical direction and the horizontal step plate disposed along horizontal direction, enclosing with the bottom wall 13 of the liner 1 to form the compressor cavity for placing the compressor 4. Furthermore, an air return inlet connecting to the evaporator cavity is disposed on the vertical step plate connected to the second cover plate portion 22 is for airflow circulation in the freezer.

[0099] Optionally, the air return cover plate 2 is disposed at the upper portion of the compressor cavity step 14.

[0100] It should be understood that the air return cover plate 2 is disposed at the upper portion of the compressor cavity step 14, so that the air return cover plate 2, the compressor cavity step 14, and the sidewall of the liner 1 enclose together to form the evaporator cavity for placing the evaporator. The evaporator is located at the upper portion of the compressor cavity step 14, thus, the evaporator does not occupy too much interior space of the liner 1, ensuring the storage volume of the storage cavity, making the evaporator cavity more compact, and reducing the bulkiness of the interior of the freezer.

[0101] Optionally, the evaporator comprises a first evaporator 31 and a second evaporator 32. The first evaporator 31 is disposed at one end of the evaporator cavity, and an included 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 an included angle between the second evaporator 32 and the horizontal direction is less than or equal to the first angle. The total area of the evaporators V is a sum of the areas of the first evaporator 31 and the second evaporator 32.

[0102] By providing the first evaporator 31 and the second evaporator 32, the first evaporator 31 is located at one end of the evaporator cavity, and the second evaporator 32 is located at the other end of the evaporator cavity, improving the refrigeration efficiency inside the freezer. Furthermore, the included angle between the first evaporator 31 and the horizontal direction is less than or equal to the first angle, and the included angle between the second evaporator 32 and the horizontal direction is less than or equal to the first angle, thus the first evaporator 31 and the second evaporator 32 are in an inclined state, making the first evaporator 31 and the second evaporator 32 convenient to drain defrost water. Specifically, the first angle is selected from at least one of 10°, 15°, 20°, 25°, and 30°. Each of the first evaporator 31 and the second evaporator 32 is provided with a drain port, and each of the first evaporator 31 and the second evaporator 32 is inclined toward the drain port, so that the defrost water generated by the first evaporator 31 and the second evaporator 32 flows out from the freezer through the drain port.

[0103] Optionally, the evaporator cavity comprises an air return cavity between the first evaporator 31 and the second evaporator 32, the first cover plate portion 21 is provided with a first air return inlet 211 at the top of the air return cavity, and the second cover plate portion 22 is provided with a second air return inlet 221 at the side of the air return cavity. The area of the first air return inlet 211 is greater than or equal to the area of the second air return inlet 221.

[0104] The air return cavity is disposed between the first evaporator 31 and the second evaporator 32, so that airflow inside the freezer flows to the first evaporator 31 and the second evaporator 32, respectively, after flowing back to the air return cavity through the air return inlet, avoiding interference of the airflow flowing to the two evaporators. Furthermore, the first cover plate portion 21 and the second cover plate portion 22 are disposed at the first air return inlet 211 located at the top of the air return cavity and disposed at the second air return inlet 221 located at the side of the air return cavity, respectively, improving the air return efficiency, and improving airflow circulation efficiency inside the freezer.

[0105] Optionally, the first air return inlet 211 comprises a plurality of first air return portions 2111 disposed side by side. A width of the first air return portion 2111 is less than or equal to a first width threshold, and / or, a length of the first air return portion 2111 is greater than or equal to a first length threshold.

[0106] Thus, the first air return inlet 211 is provided with a plurality of first air return portions 2111 disposed side by side, making airflow flow through the first air return inlet 211 into the air return cavity more effectively and improving the air return efficiency. Furthermore, the width of the first air return portion 2111 is set to be less than or equal to the first width threshold, or the length of the first air return portion 2111 is set to be greater than or equal to the first length threshold, or the width of the first air return portion 2111 is less than or equal to the first width threshold and the length of the first air return portion 2111 is greater than or equal to the first length threshold simultaneously. Thus, the first air return portion 2111 maintains a certain air return area, ensuring the air return efficiency of the whole first air return inlet 211.

[0107] Optionally, the upper portion of the first air return inlet 211 is provided with an air return guiding plate 2112.

[0108] As shown in Fig. 5, the upper portion of the first air return inlet 211 is provided with the air return guiding plate 2112. Thus, airflow directly flows into the air return cavity by the guiding effect of the air return guiding plate 2112, and flows into the evaporator, reducing airflow disturbance.

[0109] Optionally, the liner 1 comprises a first sidewall 11, and the first sidewall 11 defines an air supply channel with the air supply outlet 15. The air supply channel is internally provided with the fan 5.

[0110] Thus, the first sidewall 11 of the liner 1 defines an air supply channel with the air supply outlet 15, and the air supply channel is internally provided with the fan 5. When the freezer operates, after airflow inside the evaporator cavity flows through the evaporator and the temperature of the airflow reduced, under the driving of the fan 5, the airflow flows into air supply channel, then flows to the storage cavity through the air supply outlet 15, after refrigerating the goods inside the storage cavity, the airflow flows back to the evaporator cavity through the air return inlet. Thus, the temperature of the interior space of the freezer can be reduced to a set temperature to meet users' actual refrigeration requirements.

[0111] In some embodiments, the freezer comprises the liner 1, the air return cover plate 2, and an evaporator group 3. The liner 1 encloses the interior space, and the liner 1 defines the air supply channel with the air supply outlet 15. The air return cover plate 2 is located in the interior space and divides the interior space into the storage cavity and the evaporator cavity provided with the evaporator, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate 2 is provided with the air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The evaporator group 3 comprises the first evaporator 31, the second evaporator 32 disposed inside the evaporator cavity, and the evaporator cavity comprises the air return cavity disposed between the first evaporator 31 and the second evaporator 32, and the distance between the first evaporator 31 and the second evaporator 32 L is satisfied the relationship of L≥S / (a'+c'), where S is the total area of the air return inlet, a' and c' are lengths of two different positions of the air return cavity and the first evaporator 31, respectively, and at least one of the two different positions is close to the air return inlet.

[0112] As shown in Figs. 3 and 7, the evaporator group 3 comprises the first evaporator 31 and the second evaporator 32 disposed inside the evaporator cavity, and the evaporator cavity comprises the air return cavity disposed between the first evaporator 31 and the second evaporator 32. Airflow inside the freezer flows to the first evaporator 31 and the second evaporator 32, respectively, after flowing back to the air return cavity through the air return inlet, avoiding interference of the airflow flowing to the two evaporators. By providing the distance of the first evaporator 31 and the second evaporator 32 L is satisfied the relationship of L≥S / (a'+c'), where S is the total area of the air return inlet, a' and c' is length of two different positions of the air return cavity or the first evaporator 31, respectively, and at least one of the two different positions is close to the air return inlet. Thus, the distances between a plurality of evaporators are more reasonable, and the refrigeration of the freezer is effective, meeting the actual refrigeration requirement.

[0113] As described above, the formula of yS=V, in a case where both of the length, width, and height of the first evaporator and the second evaporator are a, b, c, respectively, and the volume of each is V, the formula of L≥2V / y(a'+c') or L≥2abc / y(a'+c') is satisfied.

[0114] Optionally, the air return cover plate 2 comprises the first cover plate portion 21 disposed along the horizontal direction, and the first cover plate portion 21 is provided with a first air return inlet 211 at the top of the air return cavity. a' is a length of a position close to the first air return inlet 211 in the air return cavity, a' is greater than or equal to the length of the first air return inlet 211, and less than or equal to the total length of first cover plate portion 21 along the length direction of the first air return inlet 211.

[0115] Thus, the first cover plate portion 21 is disposed at the first air return inlet 211 located at the top of the air return cavity, improving the air return efficiency of airflow inside the freezer flowing into the air return cavity through the first air return inlet 211, and improving airflow circulation efficiency inside the freezer; a' is a length of a position close to the first air return inlet 211 in the air return cavity, a' is greater than or equal to the length of the first air return inlet 211, and less than or equal to the total length of first cover plate portion 21 along the length direction of the first air return inlet 211, so that the contact surface between airflow flowing into the air return cavity through the first air return inlet 211 and the evaporator can be greater, and the heat exchange efficiency of the evaporator can be higher.

[0116] Optionally, the first evaporator 31 comprises a first edge 311, the first edge 311 is close to the first air return inlet 211 and has a first length a. The length of a' is equal to the first length a of the first edge 311.

[0117] Thus, the first edge 311 of the first evaporator 31 is close to the first air return inlet 211 and has a first length a, that is, the first edge 311 is a windward side of the first evaporator 31. By setting the value of a' equal to the length a of the first length of the first edge 311, so that the contact area of the windward surface of the first evaporator 31 and the air return cavity is greater, and the heat exchange efficiency of the evaporator can be higher.

[0118] Optionally, the air return cover plate 2 further comprises the second cover plate portion 22 disposed along the vertical direction, and the second cover plate portion 22 is provided with a second air return inlet 221 at the side of the air return cavity. c' is a length a position close to the second air return inlet 221 in the air return cavity, c' is greater than or equal to the length of the second air return inlet 221, and less than or equal to the total length of second cover plate portion 22 along the length direction of the second air return inlet 221.

[0119] Thus, the second cover plate portion 22 is disposed at the second air return inlet 221 located at the side of the air return cavity, improving the air return efficiency of airflow inside the freezer flowing into the air return cavity through the second air return inlet 221, and improving airflow circulation efficiency inside the freezer. c' is a length of a position close to the second air return inlet 221 in the air return cavity, c' is greater than or equal to the length of the second air return inlet 221, and less than or equal to the total length of second cover plate portion 22 along the length direction of the second air return inlet 221, so that the contact surface between airflow flowing into the air return cavity through the second air return inlet 221 and the evaporator can be greater, and the heat exchange efficiency of the evaporator can be higher.

[0120] Optionally, the first evaporator 31 comprises a second edge 312, and the second edge 221 is close to the second air return inlet 221 and has a second length c. The value 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).

[0121] Thus, the second edge 312 of the first evaporator 31 is close to the second air return inlet 221 and has a second length c, that is, the second edge 312 is the other windward side of the first evaporator 31. By setting the value of a' equal to the length of the second length c of the first edge 312, so that the contact area of the windward surface of the first evaporator 31 and the air return cavity is greater, and the heat exchange efficiency of the evaporator can be higher.

[0122] In some embodiments, the freezer comprises the liner 1, the air return cover plate 2, the evaporator, and a compressor 4. The liner 1 encloses the interior space, and the liner 1 defines the air supply channel with the air supply outlet 15. The air return cover plate 2 is located in the interior space and divides the interior space into the storage cavity and the evaporator cavity provided with the evaporator, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate 2 is provided with the air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The compressor 4 is disposed at the lower portion of the evaporator. The air return cover plate 2 comprises a side cover plate portion, and a horizontal thermal insulation spacing distance m is provided between the evaporator and the side cover plate portion.

[0123] As shown in Fig. 6, the freezer comprises the liner 1, the air return cover plate 2, the evaporator, and the compressor 4. The air return cover plate 2 comprises the side cover plate portion, the horizontal thermal insulation spacing distance m is provided between the evaporator and the side cover plate portion for evaporator insulation, avoiding the loss of refrigeration capacity from the evaporator, and ensuring the heat exchange effect between the airflow of the freezer and the evaporator, and improving the refrigeration effect of the freezer.

[0124] Optionally, the horizontal thermal insulation spacing distance m is greater than or equal to 2 mm, and / or, the horizontal thermal insulation spacing distance m is less than or equal to 50 mm.

[0125] By setting the size of the horizontal thermal insulation spacing distance m greater than or equal to 2 mm, the insulation requirement for the temperature of the evaporator cavity is met, and ensures the refrigeration effect of the freezer. Furthermore, setting the size of the horizontal thermal insulation spacing distance m less than or equal to 50 mm, more spaces are saved while the horizontal thermal insulation spacing distance m meets the insulation requirement for the temperature of the evaporator cavity, and saves more filling materials. In a case where the size of the horizontal thermal insulation spacing distance m is less than 2 mm, the insulation effect for the temperature of the evaporator cavity is poor. In a case where the size of the horizontal thermal insulation spacing distance m is greater than 50 mm, more spaces are occupied and more filling materials are wasted.

[0126] Optionally, the air return cover plate 2 comprises the first cover plate portion 21 disposed along the horizontal direction. A vertical thermal insulation spacing distance n is provided between the evaporator and the first cover plate portion 21.

[0127] The vertical thermal insulation spacing distance n is provided between the evaporator and the first cover plate portion 21 for evaporator insulation, avoiding the loss of refrigeration capacity from the evaporator, ensuring the heat exchange effect between the airflow of the freezer and the evaporator, and improving the refrigeration effect.

[0128] Optionally, the horizontal thermal insulation spacing distance m is greater than or equal to 2 mm, and / or, the vertical thermal insulation spacing distance n is less than or equal to 50 mm.

[0129] By setting the size of the horizontal thermal insulation spacing distance m greater than or equal to 2 mm, the insulation requirement for the temperature of the evaporator cavity is met, and ensures the refrigeration effect of the freezer. Furthermore, setting the size of the vertical thermal insulation spacing distance n less than or equal to 50 mm, more spaces are saved while the vertical thermal insulation spacing distance n meets the insulation requirement for the temperature of the evaporator cavity, and saves more filling materials. In a case where the size of the vertical thermal insulation spacing distance n is less than 2 mm, the insulation effect for the temperature of the evaporator cavity is poor. In a case where the size of the horizontal thermal insulation spacing distance m is greater than 50 mm, more spaces are occupied, and more filling materials are wasted.

[0130] Optionally, insulation material is filled at the horizontal thermal insulation spacing distance m, and / or, insulation material is filled at the vertical thermal insulation spacing distance n.

[0131] Filling insulation material at a certain distance at the horizontal thermal insulation spacing distance m or vertical thermal insulation spacing distance n, for example, foam material. Due to a low temperature inside the evaporator cavity, a certain thickness of the foam can effectively inhibit heat exchange between the evaporator cavity and the air inside the external cabinet of the evaporator cavity wall, and insulate the temperature inside the evaporator cavity, in addition, ensuring the heat exchange effect between airflow inside the freezer and the evaporator. Furthermore, a certain thickness of foam can further provide a support effect for the side cover plate portion or the first cover plate portion 21. Furthermore, insulation material can be filled at the horizontal thermal insulation spacing distance m and the vertical thermal insulation spacing distance n, thus the insulation effect is better for the insulation material on the temperature inside the evaporator cavity.

[0132] Optionally, a volute casing depth g of the fan 5 is greater than or equal to 50 mm, and / or, a volute casing depth g of the fan 5 is greater than or equal to 150 mm.

[0133] As shown in Fig. 4, by setting the size of the volute casing depth g of fan 5 greater than or equal to 50 mm, it is ensured that the fan 5 operation is not disturbed, and satisfies the efficient circulation of the airflow inside the freezer. Furthermore, by setting the size of the volute casing depth g of fan 5 greater than or equal to 150 mm, it is possible to ensure that the normal operation of fan 5 is not disturbed, and save more space. In a case where the size of the volute casing depth g of the fan 5 is less than 50 mm, it is possible to affect the normal operation of the fan 5. In a case where the size of the volute casing depth g of the fan 5 is greater than 150 mm, more spaces are occupied.

[0134] Optionally, a distance h between the outer side of the volute casing of the fan 5 and the evaporator is greater than or equal to 10 mm. Optionally, a distance h between an outer side of the volute casing of the fan 5 and the evaporator is greater than or equal to 200 mm.

[0135] As shown in Fig. 6, by setting the distance h between the outer side of the volute casing of the fan 5 and the evaporator greater than or equal to 10 mm, ensuring the heat exchange between the air return airflow and the evaporator, and having a sufficient distance to re-straightened and flow into an air channel of volute casing of the fan 5 for effective airflow circulation. Furthermore, by setting the distance h between the outer side of the volute casing of the fan 5 and the evaporator less than or equal to 200 mm, ensuring the heat exchange between the air return airflow and the evaporator, and having a sufficient distance to re-straightened and flow into an air channel of volute casing of the fan 5 for effective airflow circulation, and saving space inside the evaporator cavity. In a case where the distance h between the outer side of the volute casing of the fan 5 and the evaporator is less than 10 mm, the efficiency of the heat exchange between the air return airflow and the evaporator and re-enter the air channel of the volute casing of the fan 5 is affected. In a case where the size of the distance h between the outer side of the volute casing of the fan 5 and the evaporator is greater than 200 mm, the space of the evaporator cavity is wasted.

[0136] Optionally, the freezer further comprises the compressor cavity step 14. The compressor cavity step 14 is protruded upward from the bottom wall 13 of the liner 1 and is disposed at the lower portion of the air return cover plate 2. The compressor cavity step 14 and the bottom wall 13 of the liner 1 enclose to form a compressor cavity for placing the compressor 4.

[0137] The freezer needs to place the compressor 4, the condenser, and other assemblies. Therefore, the compressor cavity step 14 protruded upward from the bottom wall 13 of the liner 1, and the bottom wall 13 of the liner 1 encloses together to form a compressor cavity for placing the compressor 4. It should be understood that the compressor cavity step 14 is disposed at the lower portion of the air return cover plate 2, so that the air return cover plate 2, the compressor cavity step 14, and the sidewall of the liner 1 can enclose the evaporator cavity to place the evaporator. The evaporator is located at the upper portion of the compressor cavity step 14. Thus, the evaporator does not occupy too much interior space of the liner 1, ensuring the storage volume of the storage cavity, making the evaporator cavity more compact, and reducing the bulkiness of the interior of the freezer.

[0138] In some embodiments, the freezer comprises the liner 1, the air return cover plate 2, and the evaporator group 3. The liner 1 encloses the interior space, and the liner 1 defines the air supply channel with the air supply outlet 15. The air return cover plate 2 is located in the interior space and divides the interior space into the storage cavity and the evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate 2 is provided with the air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The evaporator group 3 comprises the first evaporator 31, the second evaporator 32, and a communicating pipe 33 communicating with the first evaporator 31 and the second evaporator 32. A foaming layer is disposed at an inner side of the evaporator cavity, and at least part of the communicating pipe 33 is disposed in the foaming layer.

[0139] The freezer comprises the liner 1, the air return cover plate 2, and the evaporator group 3. The liner 1 defines the air supply channel with the air supply outlet 15, and refrigeration airflow can be provided in the interior space enclosed by the liner 1 to reduce the temperature of the interior space. The air return cover plate 2 is provided with the air return inlet, when the freezer operates, after the airflow inside the evaporator cavity flows through the evaporator and the temperature of the airflow reduced, under the driving of the fan 5, airflow flows into air supply channel, then flows to the storage cavity through the air supply outlet 15, after refrigerating the goods inside the storage cavity, the airflow flows back to the evaporator cavity. The evaporator group 3 comprises the first evaporator 31, the second evaporator 32, and the communicating pipe 33 communicates with the first evaporator 31 and the second evaporator 32, thus providing two communicating evaporators that can improve the refrigeration efficiency of the freezer. By setting at least part of the communicating pipe 33 in the foaming layer of the evaporator cavity, it avoids the whole communicating pipe 33 from frost, affects the heat exchange of the communicating evaporator, and improves the refrigeration effect of the freezer.

[0140] Optionally, the foaming layer at least comprises a bottom foaming layer disposed at the bottom of the evaporator group 3. At least part of the communicating pipe 33 is disposed in the bottom foaming layer.

[0141] Thus, at least part of the communicating pipe 33 in the bottom foaming layer of the bottom of the evaporator group 3, avoiding the whole communicating pipe 33 from frost and affects the heat exchange efficiency of the communicating evaporator. Furthermore, reducing the uncertainties of the communicating pipe 33 being suspended in the air and being pulled, and avoiding damage to the communicating pipe 33.

[0142] Optionally, the first evaporator 31 and the second evaporator 32 are communicated in series or parallel.

[0143] Thus, in a case where the first evaporator 31 and the second evaporator 32 are communicated in series, the temperature of the first evaporator 31 and the second evaporator 32 can be uniformly controlled, so that the temperature of the airflow flowing from the air supply channels of the first evaporator 31 and the second evaporator 32 are similar or consistent. In a case where the first evaporator 31 and the second evaporator 32 are communicated in parallel, each evaporator can be controlled independently, and the temperature of the airflow from the air supply channels of the first evaporator 31 and the second evaporator 32 can be controlled independently, avoiding mutual interference between the two evaporators.

[0144] Optionally, the liner 1 comprises the first sidewall 11, the first sidewall 11 defines a first air supply channel 111 with the air supply outlet 15, where the first air supply channel 111 is internally provided with a first fan 5, a first inlet and a first outlet of the first evaporator 31 are disposed at a side close to the first fan 5. And / or, the liner 1 comprises the second sidewall 12, the second sidewall 12 defines a second air supply channel 112 with the air supply outlet 15, where the second air supply channel 112 is internally provided with a second fan 5, a second inlet and a second outlet of the second evaporator 32 are disposed at a side close to the second fan 5.

[0145] Thus, the first sidewall 11 of the liner 1 defines the first air supply channel 111 with the air supply outlet 15 and internally provided with the first fan 5, the first inlet and the first outlet of the first evaporator 31 is disposed at the side close to the first fan 5, so that airflow of the freezer flows from the first sidewall 11 to the air return inlet of the air return cover plate 2 through the first evaporator 31 for airflow circulation. The second sidewall 12 of the liner 1 defines the second air supply channel 112 with the air supply outlet 15 and internally provided with the second fan 5, the second inlet and the second outlet of the second evaporator 32 is disposed at the side close to the second fan 5, so that airflow of the freezer flows from the second sidewall 12 to the air return inlet of the air return cover plate 2 through the second evaporator 32 for airflow circulation. Thus, airflow of the freezer flows from the first sidewall 11 and the second sidewall 12 into the air return inlet of the air return cover plate 2, reducing the flow distance of the airflow, reducing the obstruction of other components during the airflow flows, and improving the air-cooled refrigeration effect of the freezer.

[0146] Optionally, the communicating pipe 33 is disposed below the first inlet and the first outlet of the first evaporator 31. And / or, the communicating pipe 33 is disposed below the second inlet and the second outlet of the second evaporator 32.

[0147] Thus, the communicating pipe 33 is disposed below the first inlet and the second outlet of the first evaporator 31, or, the communicating pipe 33 is disposed below the second inlet and the second outlet of the second evaporator 32, convenient for the refrigeration to communicate inside the first evaporator 31 and the second evaporator 32. Furthermore, the communicating pipe 33 can be disposed close to the bottom of the evaporator cavity, reducing the bending of the communicating pipe 33, shortening the length of the communicating pipe 33, and convenient for installation of the communicating pipe 33.

[0148] Optionally, the first evaporator 31 comprises a first heat exchanger pipe group 314 and a first heating pipe group 315, and at least part of the first heating pipe group 315 is disposed below the first heat exchanger pipe group 314. And / or, the second evaporator 32 comprises a second heat exchanger pipe group 321 and a second heating pipe group 322, and at least part of the second heating pipe group 332 is disposed below the second heat exchanger pipe group 321.

[0149] Thus, at least part of the first heat exchanger pipe group 315 of the first evaporator 31 is disposed below the first heat exchanger pipe group 314, for heating the first evaporator 31 to defrost. Or, at least part of the second heating pipe group 322 of the second evaporator 32 is disposed below the second heat exchanger pipe group 321, for heating the second evaporator 32 to defrost. Furthermore, the first heat exchanger pipe group 315 of the first evaporator 31 and the second heating pipe group 322 of the second evaporator 32 are at least a portion of disposed below the first heat exchanger pipe group 314 and the second heat exchanger pipe group 321, respectively, for heating the first evaporator 31 and the second evaporator 32 to defrost, respectively, and not affect the heat exchange efficiency of the first evaporator 31 and the second evaporator 32.

[0150] In some embodiments, the freezer comprises the liner 1, the air return cover plate 2, and the evaporator group 3. The liner 1 encloses the interior space, and the liner 1 defines the air supply channel with the air supply outlet 15. The air return cover plate 2 is located in the interior space and divides the interior space into the storage cavity and the evaporator cavity, and the outlet of the evaporator cavity is communicated with the inlet of the air supply channel. The air return cover plate 2 is provided with the air return inlet, and airflow in the storage cavity can flow into the evaporator cavity through the air return inlet. The evaporator group 3 comprises the first evaporator 31, the second evaporator 32, and a communicating pipe 33 communicating with the first evaporator 31 and the second evaporator 32. The evaporator group 3 comprises a heat conducting fin group and a heat exchanger pipe group through the heat conducting fin group, and a distance between at least part of the communicating pipe 33 and the heat conducting fin group is less than or equal to a heat conducting distance.

[0151] As shown in Fig. 8, the freezer comprises the liner 1, the air return cover plate 2, and the evaporator group 3. The liner 1 defines the air supply channel with the air supply outlet 15, and refrigeration airflow can be provided in the interior space enclosed by the liner 1 to reduce the temperature of the interior space. The air return cover plate 2 is provided with the air return inlet, when the freezer operates, after airflow inside the evaporator cavity flows through the evaporator and the temperature of the airflow reduced, under the driving of the fan 5, the airflow flows into air supply channel, then flows to the storage cavity through the air supply outlet 15, after refrigerating the goods inside the storage cavity, the airflow flows back to the evaporator cavity through the air return inlet. The evaporator group 3 comprises the first evaporator 31, the second evaporator 32, and a communicating pipe 33 communicating with the first evaporator 31 and the second evaporator 32, thus providing two communicating evaporators that can improve the refrigeration efficiency of the freezer. By setting the distance between at least the portion of the communicating pipe 33 and the heat conducting fin group is less than or equal to the heat conducting distance, so as to avoid the whole communicating pipe 33 from frosting or to defrost the communicating pipe 33 as soon as possible after frosting, ensuring the heat exchange efficiency of the evaporator, and improving the refrigeration effect of the freezer.

[0152] Optionally, the heat conducting distance is less than or equal to 10 mm.

[0153] By setting the heat conducting distance less than or equal to 10 mm, so as to ensure the function for communicating pipe 33 to avoid frosting or accelerate defrosting, and ensuring the heat exchange efficiency of the evaporator. In a case where the heat conducting distance is greater than 10 mm, the heat conducting of the communicating pipe from the heat conducting pipe is affected, and the defrosting efficiency after frosting of the communicating pipe 33 is affected.

[0154] Optionally, the evaporator cavity comprises the air return cavity located between the first evaporator 31 and the second evaporator 32. At least part of the communicating pipe 33 is disposed in the air return cavity.

[0155] The air return cavity is disposed between the first evaporator 31 and the second evaporator 32, so that after flowing back to the air return cavity through the air return inlet, airflow inside the freezer flows to the first evaporator 31 and the second evaporator 32, respectively, avoiding interference of the airflow flowing to the two evaporators. At least part of the communicating pipe 33 is disposed in the air return cavity, the airflow flowing into the air return inlet flows through the communicating pipe 33, so as to close to the heating and defrosting device of the freezer, and the communicating pipe 33 can be better defrosted.

[0156] Optionally, the first evaporator 31 comprises a first heat conducting fin group 316, the communicating pipe 33 comprises a first bend pipe section 331, a distance between the first bend pipe section 331 and the first heat conducting fin group 316 is less than or equal to the heat conducting distance. And / or, the second evaporator 32 comprises a second heat conducting fin group 323, the communicating pipe 33 comprises a second bend pipe section 332, a distance between the first bend pipe section 332 and the second heat conducting fin group 323 is less than or equal to the heat conducting distance.

[0157] The distance between the first bend pipe section 331 of the communicating pipe and the first heat conducing fin is less than or equal to the heat conducting distance, so as to ensure the first heat conducing fin effectively conducts heat to the first bend pipe section 331 of the communicating pipe, and avoid the communicating pipe 33 frosting or accelerate defrosting after frosting. The distance between the second bend pipe section 332 of the communicating pipe and the second heat conducing fin is less than or equal to the heat conducting distance, so as to ensure the second heat conducing fin effectively conducts heat to the second bend pipe section 332 of the communicating pipe, and avoid the communicating pipe 33 frosting or accelerate defrosting after frosting.

[0158] Optionally, the first inlet and the first outlet of the first evaporator 31 are disposed facing a side of the air return cavity. And / or, the second inlet and the second outlet of the second evaporator 32 are disposed facing a side of the air return cavity.

[0159] The first inlet and the first outlet of the first evaporator 31 are disposed facing the side of the air return cavity, thus it is convenient for the refrigeration inside the first evaporator 31 to flow into the second evaporator 32. The second inlet and the second outlet of the second evaporator 32 are disposed facing the side of the air return cavity, thus it is convenient for the refrigeration inside the second evaporator 32 to flow to the first evaporator 31. The first inlet and the first outlet of the first evaporator 31, and, the second inlet and the second outlet of the second evaporator 32 are disposed facing the side of the air return cavity, thus it is more convenient for communicating of the refrigeration between the first evaporator 31 and the second evaporator 32, and improving the refrigeration effect of the freezer.

[0160] Optionally, the freezer further comprises the compressor 4. The compressor 4 is disposed at the lower portion of the evaporator group 3.

[0161] Optionally, the freezer further comprises the compressor cavity step 14. The compressor cavity step 14 is protruded upward from the bottom wall 13 of the liner 1, and is disposed at the lower portion of the air return cover plate 2. The compressor cavity step 14 and the bottom wall 13 of the liner 1 enclose together to form a compressor cavity for placing the compressor 4.

[0162] The freezer needs to place the compressor 4, a condenser, and other assemblies. Therefore, the compressor cavity step 14 (protruded upward from the bottom wall 13 of the liner 1) and the bottom wall 13 of the liner 1 enclose together to form a compressor cavity for placing the compressor 4. It should be understood that the compressor cavity step 14 is disposed at the lower portion of the air return cover plate 2, so that the air return cover plate 2, the compressor cavity step 14, and the sidewall of the liner 1 enclose the evaporator cavity to place the evaporator. The evaporator is located at the upper portion of the compressor cavity step 14, thus, the evaporator does not occupy too much interior space of the liner 1, ensuring the storage volume of the storage cavity, making the evaporator cavity more compact, and increasing practical space in the freezer.

[0163] In some embodiments, the fan 5 comprises a volute casing-volute tongue assembly 52, and a wind wheel 51 disposed inside the volute casing-volute tongue assembly 52. The volute casing-volute tongue assembly 52 comprises a first volute casing 521 and a first volute tongue 522, and a second volute casing 523 and a second volute tongue 524. The first volute casing 521 and the first volute tongue 522 enclose to form a first fan outlet 53. The second volute casing 523 and the second volute tongue 524 enclose to form a second fan outlet 54. The wind wheel center 511 and the first volute tongue 522 form a first auxiliary connection line, and the wind wheel center 511 and the second volute tongue 524 form a second auxiliary connection line. An included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°.

[0164] As shown in Fig. 11, the fan 5 comprises the volute casing-volute tongue assembly 52, and the wind wheel 51 disposed inside the volute casing-volute tongue assembly 52. In the volute casing-volute tongue assembly 52, the first volute casing 521 and the first volute tongue 522 enclose to form a first fan outlet 53, and the second volute casing 523 and the second volute tongue 524 enclose to form a second fan outlet 54. The wind wheel center 511 forms a first auxiliary connection line 11 and a second auxiliary connection line l2 with the first volute tongue 522 and the second volute tongue 524, respectively. An included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is greater than 90° and less than 180°, so that the air supply volume of different air channels can be accurately controlled by the fan 5, realizing accurately control of the air supply volume of the interior space, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption.

[0165] In some embodiments, the first volute tongue 522 of the volute casing-volute tongue assembly 52 of the fan 5 is in an arch shape, as shown in Fig. 12. The wind wheel 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 first auxiliary connection line l1 is a connection line between the wind wheel center 511 and the arc end of the first volute tongue 522 close to the first fan outlet 53.

[0166] Specifically, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 can be defined as 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, and 175°, and can be selected and defined according to the requirements for different air supply speed ratio of the first air supply channel 111 and the second air supply channel 112.

[0167] In some embodiments, the freezer comprises the liner 1 and a fan 5. The liner 1 encloses the interior space, the liner 1 comprises the first sidewall 11, and the first sidewall 11 defines the first air supply channel 111 and the second air supply channel 112. The fan 5 comprises the first fan outlet 53 communicating with the first air supply channel 111, and the second fan outlet 54 communicating with the second air supply channel 112. The fan 5 is the above fan 5.

[0168] In the embodiment of the present disclosure, the freezer comprises the liner 1 and the fan 5. The liner 1 encloses the interior space, the first sidewall 11 of the liner 1 is provided with the first air supply channel 111 and the second air supply channel 112, and the refrigeration airflow can be provided in the interior space enclosed by the liner 1 to reduce the temperature of the interior space. The fan 5 comprises the volute casing-volute tongue assembly 52, and the wind wheel 51 disposed inside the volute casing-volute tongue assembly 52. In the volute casing-volute tongue assembly 52, the first volute casing 521 and the first volute tongue 522 enclose to form a first fan outlet 53, and the second volute casing 523 and the second volute tongue 524 enclose to form a second fan outlet 54. And, the first air supply channel 111 and the second air supply channel 112 of the first sidewall 11 of the liner 1 are communicated with the first fan outlet 53 and the second fan outlet 54 of the fan 5, respectively. Driven by the fan 5, refrigeration airflow flows into the interior space enclosed by the liner 1 through the first air supply channel 111 and the second air supply channel 112 to reduce the temperature of the interior space. The wind wheel center 511 forms the first auxiliary connection line l1 and the 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 and the second auxiliary connection line is greater than 90° and less than 180°, so that the air supply volume of different air channels can be accurately controlled by the fan 5, realizing accurately control of the air supply volume of the interior space, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption.

[0169] Optionally, the first air supply channel 111 is disposed at the upper portion of the first sidewall 11, and the second air supply channel 112 is disposed at the lower portion of the first sidewall 11. An included angle between the second auxiliary connection line l2 (formed by the wind wheel center 511 and the second volute tongue 524) and a perpendicular line l3 is greater than or equal to 20° and less than or equal to 60°. Or, the included angle between the second auxiliary connection line l2 (formed by the wind wheel center 511 and the second volute tongue 524) and the perpendicular line l3 is greater than or equal to 20° and less than or equal to 40°.

[0170] Thus, the position of the second volute tongue can be determined by the included angle between the second auxiliary connection line l2 and the perpendicular line l3. Furthermore, the position of the first volute tongue can be determined by the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2, that is, further realizing accurate air supply to the first air supply channel 111 and the second air supply channel 112 by the fan 5.

[0171] Optionally, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is greater than 100° and less than or equal to 140°. Or, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is greater than 130° and less than or equal to 140°. Or, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l3 is greater than 170° and less than or equal to 180°.

[0172] As shown in Figs. 10 and 11, the upper portion and the lower portion of the first sidewall 11 of the liner 1 are provided with the first air supply channel 111 and the second air supply channel 112, respectively. The first air supply channel 111 is provided with a first air channel outlet 1113, and the second air supply channel 112 is provided with the second air channel outlet 1123. When the freezer operates, during the air circulation process, the fan 5 utilizes the first air supply channel 111 and the second air supply channel 112 to deliver refrigeration airflow into the interior space enclosed by the liner 1 through the first air channel outlet and the second air channel outlet. When the air pressure is constant, due to the cold air naturally sinking, the ratio of the air supply volume between the first air supply channel 111 and the second air supply channel 112 becomes one of the main factors affecting the temperature uniformity inside the cabinet. In the embodiment of the present disclosure, the wind wheel center 511 forms the first auxiliary connection line l1 and the 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 greater than 90° and less than 180°, the fan 5 can accurately control the air supply volume for the first air supply channel 111 and the second air supply channel 112 by the first fan outlet 53 and the second fan outlet 54, respectively, realizing accurately control of the air supply volume of the interior space, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption.

[0173] In the embodiment of the present disclosure, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is greater than130° and less than 140°, and the included angle between the second auxiliary connection line l2 (formed by the wind wheel center 511 and the second volute tongue 524) and the perpendicular line l3 is greater than or equal to 20° and less than or equal to 40°.

[0174] Taking a freezer with a volume of 200 L, based on the cold air naturally sinks, the included angle between the first auxiliary connection line l1 and the second auxiliary connection line l2 is 135°, and the included angle between the second auxiliary connection line l2 (formed by the wind wheel center 511 and the second volute tongue 524) and the perpendicular line l3 is 32° is as an example, cooperated with the first air supply channel 111 is provided with the first air channel outlet 1113 and the second air supply channel 112 is provided with the second air channel outlet 1123, the temperature difference inside the freezer is small, improving the temperature uniformity of the freezer, improving the air-cooled refrigeration effect of the freezer, and reducing energy consumption. Specifically, refer to Table 2 and Table 3. Table 2Emb odim entS1S2S3S4First air supply channel speedair chann el perce ntageS5S6Second air supply channel speedAir chann el perce ntageTotal wind spee dAir supply volum e11.1 5 m / s1.2 m / s1.2 m / s1.2 5 m / s4.8 m / s64.00 %1.3 5 m / s1.3 5 m / s2.7 m / s36.00 %7.5 m / s1047. 56 L / min21.1 5 m / s1.2 5 m / s1.2 m / s1.1 5 m / s4.75 m / s63.76 %1.3 5 m / s1.3 5 m / s2.7 m / s36.24 %7.45 m / s1040. 57 L / min Table 3 Embodi mentEnvironm ental temperat ureAbove the compressor cavity stepCenter of the bottom wall of the linerCenter of the top of the linerRight front of the top of the linerRight rear of the top of the linerLeft front of the top of the linerLeft rear of the top of the liner143.4°C-20.4°C-20.6°C-20.4°C-19.6°C-19.4°C-19.3°C-20.3°C

[0175] As can be seen from the above Table 2, in a case where the included angle between the first auxiliary connection line and the second auxiliary connection line is 135°, and the included angle between the second auxiliary connection line (formed by the wind wheel center 511 and the second volute tongue 524) and the perpendicular line is 32°, two tests was performed under the same conditions, and the test result is shown in Embodiment 1 and Embodiment 2. In Embodiment 1, the wind speed ratios of the first air supply channel 111 and the second air supply channel 112 are 64.00% and 36.00%, respectively, and the final air supply volume is 1047.56 L / min. In Embodiment 2, the wind speed ratio of the first air supply channel 111 and the second air supply channel 112 is 63.76% and 36.24%, respectively, and the final air supply volume is 1040.57 L / min. As can be seen from the result of Embodiment 1 and Embodiment 2, considering that the base of the cold air naturally sinks, the air supply speed for the first air supply channel 111 and the second air supply channel 112 of the fan is different. Furthermore, as can be seen from Table 3, in Embodiment 1, the lowest temperature in the interior space of the liner 1 of the freezer is -20.6°C at the center of the bottom wall 13 of the liner 1, and the highest temperature is -19.3°C at the left front of the top of the liner 1. Thus, the temperature difference between the highest temperature and the lowest temperature in the interior space of the liner 1 of the freezer is 1.3°C, showing the temperature difference between different positions in the interior space of the liner 1 of the freezer is very small. That is, in the embodiment of the present disclosure, by setting the different wind speeds of the first air supply channel 111 and the second air supply channel 112, reducing the temperature difference between different positions, and improving the temperature uniformity of the freezer.

[0176] It should be understood that, in a case where other value is selected in the range that the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°, and the included angle between the second auxiliary connection line (formed by the wind wheel center 511 and the second volute tongue 524) and the perpendicular line is greater than or equal to 20° and less than or equal to 60°, the freezer can achieve test results equivalent to those of Embodiment 1 in air supply volume and temperature difference, and achieving the same beneficial effects.

[0177] Optionally, the first air supply channel 111 comprises a first pressure expanding section air channel 1111 directly communicating with the first fan outlet 53, and a first pressure stabilizing section air channel 1112 communicating with the first pressure expanding section air channel 1111. The second air supply channel 112 comprises a second pressure expanding section air channel 1121 directly communicating with the second fan outlet 54, and a second pressure stabilizing section air channel 1122 communicating with the second pressure expanding section air channel 1121. A total area of the air supply outlet 15 of the first pressure stabilizing section air channel 1112 is greater than a total area of the air supply outlet 15 of the second pressure stabilizing section air channel 1122.

[0178] The first air supply channel 1111 is provided with the first pressure expanding section air channel 1111 directly communicating with the first fan outlet 53, and the first pressure stabilizing section air channel 1112 communicating with the first pressure expanding section air channel 1111, so as to make refrigeration airflow flows into the interior space from the first air supply channel 111 more stably. The second air supply channel 112 is provided with the second pressure expanding section air channel 1121 directly communicating with the second fan outlet 54, and, the second pressure stabilizing section air channel 1122 communicating with the second pressure expanding section air channel 1121, so as to make the refrigeration airflow flows into the interior space from the second air supply channel 112 more stably. Furthermore, due to the first air supply channel 111 is distributed more refrigeration airflow, the total area of the air supply outlet 15 of the first pressure stabilizing section air channel 1112 is greater than the total area of the air supply outlet 15 of the second pressure stabilizing section air channel 1122, thus refrigeration airflow more effectively flows into the interior space through the air supply outlet 15 of the first air supply channel 111.

[0179] Optionally, the first air supply channel 111 comprises a first end air supply outlet 15 away from the fan 5, the second air supply channel 112 comprises a second end air supply outlet 15 away from the fan 5, and the liner 1 comprises an end sidewall close to the first end air supply outlet 15 and the second end air supply outlet 15. A horizontal distance between the first end air supply outlet 15 and the end sidewall is a first end spacing distance, a horizontal distance between the second end air supply outlet 15 and the end sidewall is a second end spacing distance, and the first end spacing distance is less than the second end spacing distance.

[0180] The first end spacing distance is less than the second end spacing distance, that is, the horizontal distance between the first end air supply outlet 15 and the end sidewall is less than the horizontal distance between the second end air supply outlet 15 and the end sidewall, thus the air supply volume is more even to be distributed of the second air supply outlet 15 of the second air supply channel 112, reducing the temperature difference of the different positions in the interior space enclosed by the liner 1, and improving the temperature uniformity of the freezer.

[0181] Optionally, the difference between the first end spacing distance and the second end spacing distance is greater than or equal to the length of one air supply outlet 15 of the first air supply channel 111. Or, the difference between the first end spacing distance and the second end spacing distance is greater than or equal to the length of one air supply outlet 15 of the second air supply channel 112.

[0182] The difference between the first end spacing distance and the second end spacing distance is greater than or equal to the length of one air supply outlet 15 of the first air supply channel 111. Or, the difference between the first end spacing distance and the second end spacing distance is greater than or equal to the length of one air supply outlet 15 of the second air supply channel 112, thus the second air supply channel 112 relative to the first air supply channel 111 is shortened the length of one air supply outlet 15 of the first air supply channel 111 or the length of one air supply outlet 15 of the second air supply channel 112, furthermore the air supply volume is more even to be distributed of the second air supply outlet 15 of the second air supply channel 112, reducing the temperature difference of the different positions in the interior space enclosed by the liner 1, and improving the temperature uniformity of the freezer.

[0183] The above description and drawings sufficiently illustrate embodiments of the present disclosure to enable practice by those skilled in the art. Other embodiments may comprise structural and other modifications. Embodiments represent only possible variations. Unless explicitly required, individual parts and functions are optional, and the order of operation can vary. Portions and features of some embodiments may be included in or in place of portions and features of other embodiments. Embodiments of the present disclosure are not limited to the structures already described above and shown in the figures and are subject to various modifications and changes without departing from their scope. The scope of the present invention is defined by the attached claims.

Claims

1. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner defines an air supply channel with an air supply outlet; an air return cover plate, located in the interior space and dividing the interior space into a storage cavity and an evaporator cavity, wherein an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; and an evaporator, located in the evaporator cavity; wherein a relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as: yS=V, wherein y is greater than or equal to 50.

2. The freezer according to claim 1, wherein y is less than or equal to 1000.

3. The freezer according to claim 2, wherein y is greater than or equal to 55, and less than or equal to 700.

4. The freezer according to claim 1, wherein the air return cover plate comprises: a first cover plate portion, disposed along a horizontal direction; and a second cover plate portion, disposed along a vertical direction, and connected to the first cover plate portion; wherein at least one of the first cover plate portion and the second cover plate portion is provided with the air return inlet.

5. The freezer according to claim 4, further comprising: a compressor cavity step, protruded upward from a bottom wall of the liner, comprising a vertical step plate disposed along a vertical direction and a horizontal step plate disposed along the horizontal direction; wherein the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor; wherein the vertical step plate is connected to the second cover plate portion of the air return cover plate, and an air return inlet connecting to the evaporator cavity is disposed on at least part of the vertical step plate connected to the second cover plate portion, the total area S of the air return inlet is a sum of the areas of all air return inlet.

6. The freezer according to claim 5, wherein the air return cover plate is disposed at the upper portion of the compressor cavity step.

7. The freezer according to claim 4, wherein the evaporator comprises: a first evaporator, disposed at one end of the evaporator cavity, wherein an included angle between the first evaporator and the horizontal direction is less than or equal to a first angle; and a second evaporator, disposed at the other end of the evaporator cavity, wherein an included angle between the second evaporator and the horizontal direction is less than or equal to the first angle; wherein the total volume V of the evaporator is a sum of the volumes of the first evaporator and the second evaporator.

8. The freezer according to claim 7, wherein the evaporator cavity comprises an air return cavity between the first evaporator and the second evaporator, the first cover plate portion is provided with a first air return inlet at the top of the air return cavity, and the second cover plate portion is provided with a second air return inlet at the side of the air return cavity; wherein an area of the first air return inlet is greater than or equal to an area of the second air return inlet.

9. The freezer according to claim 8, wherein the first air return inlet comprises a plurality of first air return portions disposed side by side; and wherein a width of the first air return portion is less than or equal to a first width threshold, and / or, a length of the first air return portion is greater than or equal to a first length threshold.

10. The freezer according to any one of claims 1 to 9, wherein the liner comprises a first sidewall, and the first sidewall defines an air supply channel with the air supply outlet; wherein the air supply channel is internally provided with a fan.

11. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner defines an air supply channel with an air supply outlet. an air return cover plate, located in an interior space and dividing the interior space into a storage cavity and an evaporator cavity, wherein an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; and an evaporator group, comprising a first evaporator, a second evaporator, and a communicating pipe communicating with the first evaporator and the second evaporator; wherein a foaming layer is disposed at an inner side of the evaporator cavity, and at least part of the communicating pipe is disposed in the foaming layer.

12. The freezer according to claim 11, wherein the foaming layer at least comprises a bottom foaming layer disposed at a bottom of the evaporator group; and at least part of the communicating pipe is disposed in the bottom foaming layer.

13. The freezer according to claim 11, wherein the first evaporator and the second evaporator are communicated in series or parallel.

14. The freezer according to any one of claims 11 to 13, wherein the liner comprises a first sidewall, the first sidewall defines a first sidewall air supply channel with the air supply outlet, wherein the first sidewall air supply channel is internally provided with a first fan, a first inlet and a first outlet of the first evaporator are disposed at a side close to the first fan; and / or, the liner comprises a second sidewall, the second sidewall defines a second sidewall air supply channel with the air supply outlet, wherein the second sidewall air supply channel is internally provided with a second fan, a second inlet and a second outlet of the second evaporator are disposed at a side close to the second fan.

15. The freezer according to claim 14, wherein the communicating pipe is disposed below the first inlet and the first outlet of the first evaporator; and / or, the communicating pipe is disposed below the second inlet and the second outlet of the second evaporator.

16. The freezer according to claim 11, wherein the first evaporator comprises a first heat exchanger pipe group and a first heating pipe group, and at least part of the first heating pipe group is disposed below the first heat exchanger pipe group; and / or, the second evaporator comprises a second heat exchanger pipe group and a second heating pipe group, and at least part of the second heating pipe group is disposed below the second heat exchanger pipe group.

17. The freezer according to claim 11, further comprising: a compressor cavity step, protruded upward from a bottom wall of the liner, disposed at a lower portion of the air return cover plate, and the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor.

18. The freezer according to claim 11, wherein a relationship between a total volume V of the first evaporator and the second evaporator and a total area S of the air return inlet is defined as: yS=V, wherein y is greater than or equal to 50.

19. The freezer according to claim 18, wherein y is less than or equal to 1000.

20. The freezer according to claim 19, wherein y is greater than or equal to 55, and less than or equal to 700.

21. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner defines an air supply channel with an air supply outlet. an air return cover plate, located in an interior space and dividing the interior space into a storage cavity and an evaporator cavity, wherein an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; and an evaporator group, comprising a first evaporator, a second evaporator, and a communicating pipe communicating with the first evaporator and the second evaporator; wherein the evaporator group comprises a heat conducting fin group and a heat exchanger pipe group through the heat conducting fin group, and a distance between at least part of the communicating pipe and the heat conducting fin group is less than or equal to a heat conducting distance.

22. The freezer according to claim 21, wherein the heat conducting distance is less than or equal to 10 mm.

23. The freezer according to claim 21, wherein the evaporator cavity comprises an air return cavity located between the first evaporator and the second evaporator; and wherein at least part of the communicating pipe is disposed in the air return cavity.

24. The freezer according to claim 23, wherein the first evaporator group comprises a first heat conducting fin group, the communicating pipe comprises a first bend pipe section, a distance between the first bend pipe section and the first heat conducing fin group is less than or equal to the heat conducting distance; and / or, the second evaporator group comprises a second heat conducting fin group, the communicating pipe comprises a second bend pipe section, a distance between the second bend pipe section and the second heat conducing fin group is less than or equal to the heat conducting distance.

25. The freezer according to claim 24, wherein a first inlet and a first outlet of the first evaporator are disposed facing a side of the air return cavity; and / or, a second inlet and a second outlet of the second evaporator are disposed facing a side of the air return cavity.

26. The freezer according to claim 21, further comprising: a compressor, disposed at a lower portion of the evaporator group.

27. The freezer according to claim 26, further comprising: a compressor cavity step, protruded upward from a bottom wall of the liner, and disposed at the lower portion of the air return cover plate, and the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing a compressor.

28. The freezer according to claim 21, wherein the relationship between a total volume V of the first evaporator and the second evaporator and a total area S of the air return inlet is defined as: yS=V, wherein y is greater than or equal to 50.

29. The freezer according to claim 28, wherein y is less than or equal to 1000.

30. The freezer according to claim 29, wherein y is greater than or equal to 55, and less than or equal to 700.

31. A fan, <b>characterized in that, comprising a volute casing-volute tongue assembly and a wind wheel disposed inside the volute casing-volute tongue assembly, wherein the volute casing-volute tongue assembly comprises: a first volute casing and a first volute tongue, enclosing to form a first fan outlet; and a second volute casing and a second volute tongue, enclosing to form a second fan outlet; wherein a wind wheel center and the first volute tongue form a first auxiliary connection line, the wind wheel center and the second volute tongue form a second auxiliary connection line, and an included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 90° and less than 180°.

32. The freezer according to claim 31, wherein the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 100° and less than or equal to 140°; or, the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 130° and less than or equal to 140°; or, the included angle between the first auxiliary connection line and the second auxiliary connection line is greater than 170° and less than or equal to 180°.

33. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner comprises a first sidewall, and the first sidewall is provided with a first air supply channel and a second air supply channel; and a fan, comprising a first fan outlet communicating the first air supply channel, and a second fan outlet communicating the second air supply channel; wherein the fan is according to claims 31 or 32.

34. The freezer according to claim 33, wherein the first air supply channel is disposed at an upper portion of the first sidewall, and the second air supply channel is disposed at a lower portion of the first sidewall; and the included angle between the second auxiliary connection line and a perpendicular line is greater than or equal to 20°, and less than or equal to 60°; or the included angle between the second auxiliary connection line and the perpendicular line is greater than or equal to 20°, and less than or equal to 40°, wherein the second auxiliary connection line is formed by the wind wheel center and the second volute tongue.

35. The freezer according to claim 34, wherein the first air supply channel comprises a first pressure expanding section air channel directly communicating with the first air supply outlet, and a first pressure stabilizing section air channel communicating with the first pressure expanding section air channel; and the second air supply channel comprises a second pressure expanding section air channel directly communicating with the second air supply outlet, and a second pressure stabilizing section air channel communicating with the second pressure expanding section air channel; and a total area of the air supply outlet of the first pressure stabilizing section air channel is greater than a total area of the air supply outlet of the second pressure stabilizing section air channel.

36. The freezer according to claim 34, wherein the first air supply channel comprises a first end air supply outlet away from the fan, the second air supply channel comprises a second end air supply outlet away from the fan, and the liner comprises an end sidewall close to the first end air supply outlet and the second end air supply outlet; wherein a first end spacing distance is a horizontal distance between the first end air supply outlet and the end sidewall, the second end spacing distance is a horizontal distance between the second end air supply outlet and the end sidewall, and the first end spacing distance is less than the second end spacing distance.

37. The freezer according to claim 36, wherein a difference between the first end spacing distance and the second end spacing distance is greater than or equal to a length of an air supply outlet of the first air supply channel; or the difference between the first end spacing distance and the second end spacing distance is greater than or equal to a length of an air supply outlet of the second air supply channel.

38. The freezer according to any one of claims 33 to 37, further comprising: an air return cover plate, located in the interior space and dividing the interior space into a storage cavity and an evaporator cavity, wherein an outlet of the evaporator cavity is communicated with inlets of the first air supply channel and the second air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; an evaporator, located in the evaporator cavity; and a compressor, disposed at a lower portion of the evaporator cavity.

39. The freezer according to claim 38, further comprising: a compressor cavity step, protruded upward from a bottom wall of the liner, and disposed at the lower portion of the air return cover plate, wherein the compressor cavity step and the bottom wall of the liner enclose together to form a compressor cavity for placing the compressor.

40. The freezer according to claim 38, wherein a relationship between a total volume V of the evaporator and a total area S of the air return inlet is defined as yS=V, wherein y is greater than or equal to 50, and less than or equal to 1000.

41. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner defines an air supply channel with an air supply outlet. an air return cover plate, located in the interior space and dividing the interior space into a storage cavity and an evaporator cavity, wherein an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; and an evaporator group comprising a first evaporator and a second evaporator disposed inside the evaporator cavity, wherein the evaporator cavity comprises an air return cavity disposed between the first evaporator and the second evaporator, and a distance L between the first evaporator and the second evaporator satisfies the relationship of L≥S / (a'+c'); wherein S is the total area of the air return inlet, a' and c' are lengths of two different positions of the air return cavity or the first evaporator, respectively, and at least one of the two different positions is close to the air return inlet.

42. The freezer according to claim 41, wherein the air return cover plate comprises a first cover plate portion disposed along a horizontal direction, the first cover plate portion is provided with a first air return inlet at a top of the air return cavity; wherein a' is a length of a position close to the first air return inlet in the air return cavity, a' is greater than or equal to the length of the first air return inlet, and less than or equal to a total length of the first cover plate portion along a length direction of the first air return inlet.

43. The freezer according to claim 42, wherein the first evaporator comprises a first edge, the first edge is close to the first air return inlet and has a first length a; wherein the length of a' is equal to the first length a of the first edge.

44. The freezer according to claim 42, wherein the air return cover plate further comprises a second cover plate portion disposed along a vertical direction, and the second cover plate portion is provided with a second air return inlet at the side of the air return cavity; wherein c' is a length of a position close to the second air return inlet in the air return cavity, and c' is greater than or equal to the length of the second air return inlet and less than or equal to a total length of the second cover plate portion along a length direction of the second air return inlet.

45. The freezer according to claim 44, wherein the first evaporator comprises a second edge, the second edge is close to the second air return inlet and has a second length c; wherein a length of c' is equal to the second length c of the second edge.

46. The freezer according to claim 41, wherein an included angle between the first evaporator and the horizontal direction is less than or equal to a first angle; and / or, an included angle between the second evaporator and the horizontal direction is less than or equal to the first angle.

47. The freezer according to claim 41, wherein a relationship between a total volume V of the evaporator group and a total area S of the air return inlet is defined as: yS=V, wherein y is greater than or equal to 50.

48. The freezer according to claim 47, wherein y is less than or equal to 1000.

49. The freezer according to any one of claims 41 to 48, wherein the liner comprises a first sidewall, and the first sidewall defines an air supply channel with the air supply outlet; wherein the air supply channel is internally provided with a fan.

50. A freezer, <b>characterized in that, comprising: a liner, enclosing an interior space, wherein the liner defines an air supply channel with an air supply outlet. an air return cover plate, located in the interior space and dividing the interior space into a storage cavity and an evaporator cavity provided with an evaporator, wherein an outlet of the evaporator cavity is communicated with an inlet of the air supply channel, the air return cover plate is provided with an air return inlet, airflow in the storage cavity is capable of flowing into the evaporator cavity through the air return inlet; and, a compressor, disposed at a lower portion of the evaporator, wherein the air return cover plate comprises a side cover plate portion, and a horizontal thermal insulation spacing distance m is provided between the evaporator and the side cover plate portion.

51. The freezer according to claim 50, wherein the horizontal thermal insulation spacing distance m is greater than or equal to 2 mm; and / or, the horizontal thermal insulation spacing distance m is less than or equal to 50 mm.

52. The freezer according to claim 51, wherein the air return cover plate comprises a first cover plate portion disposed along the horizontal direction; a vertical thermal insulation spacing distance n is provided between the evaporator and the first cover plate portion.

53. The freezer according to claim 52, wherein the vertical thermal insulation spacing distance n is greater than or equal to 2 mm; and / or, the vertical thermal insulation spacing distance n is less than or equal to 50 mm.

54. The freezer according to claim 52, wherein an insulation material is filled at the horizontal thermal insulation spacing distance m; and / or, an insulation material is filled at the vertical thermal insulation spacing distance n.

55. The freezer according to any one of claims 50 to 54, wherein the liner comprises a first sidewall, and the first sidewall defines an air supply channel with the air supply outlet; wherein the air supply channel is internally provided with a fan.

56. The freezer according to claim 55, wherein a volute casing depth g of the fan is greater than or equal to 50 mm; and / or the volute casing depth g of the fan is less than or equal to 150 mm.

57. The freezer according to claim 55, wherein a distance h between an outer side of the volute casing of the fan and the evaporator is greater than or equal to 10 mm; and / or the distance h between the outer side of the volute casing of the fan and the evaporator is greater than or equal to 200 mm.

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