Centrifugal fan and refrigerator having the same

Abstract

This invention provides a centrifugal fan and a freezer. The centrifugal fan includes a volute and an impeller. The volute has a fan cavity and an air inlet communicating with the fan cavity. The impeller is disposed within the fan cavity and is axially opposite to the air inlet. The volute also has a first air outlet and a second air outlet communicating with the fan cavity. The first air outlet and the second air outlet are circumferentially arranged around the axis of the impeller. The axis of the first air outlet and the axis of the second air outlet are offset along the axis of the impeller. By arranging the axes of the first air outlet and the second air outlet alternately along the axis of the impeller, the first air outlet and the second air outlet can be staggered along the axis of the impeller, thereby removing the limitations on the installation method of multiple air paths and meeting the different design requirements of the freezer.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment, and more particularly to a centrifugal fan and a freezer having the same. Background Technology

[0002] Currently, based on their refrigeration principles, freezers are generally divided into direct-cooling freezers and air-cooling freezers. Direct-cooling freezers are prone to frost buildup during use, while air-cooling freezers are favored by users because they have the advantage of being frost-free.

[0003] In related technologies, the cold energy generated in the evaporation chamber is transported to various parts of the storage chamber via multiple air ducts, which requires the centrifugal fan to have corresponding air outlets. However, since the axes of the multiple air outlets of the centrifugal fan are usually coplanar, the installation methods of the multiple air ducts are limited, making it impossible to meet the different design requirements of the freezer. Summary of the Invention

[0004] The purpose of this invention is to provide a centrifugal fan and a refrigerator that meet different design requirements.

[0005] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a centrifugal fan, comprising:

[0006] A volute, the volute having a fan cavity and an air inlet communicating with the fan cavity;

[0007] An impeller is disposed within the fan cavity and is axially opposite to the air inlet;

[0008] The volute also has a first air outlet and a second air outlet connected to the fan cavity. The first air outlet and the second air outlet are arranged circumferentially around the axis of the impeller, and the axis of the first air outlet and the axis of the second air outlet are offset along the axis of the impeller.

[0009] As a further improvement of one embodiment of the present invention, the axis of at least one air outlet extends radially along the impeller.

[0010] As a further improvement of one embodiment of the present invention, the plane containing the axis of the first air outlet is parallel to the plane containing the axis of the second air outlet.

[0011] As a further improvement of one embodiment of the present invention, the first air outlet is opposite to the impeller along a first direction, and the second air outlet is opposite to the impeller along a second direction. Both the first and second directions are perpendicular to the axis of the impeller, and the first and second directions are set at a certain angle.

[0012] As a further improvement of one embodiment of the present invention, the fan cavity has an installation space for accommodating the impeller, a first channel connecting the installation space and the first air outlet, and a second channel connecting the installation space and the second air outlet, wherein the gas flow direction in at least one channel is set at an angle of 0° to 90° with the radial direction of the impeller.

[0013] As a further improvement of one embodiment of the present invention, the gas flow direction in the first channel and the gas flow direction in the second channel are respectively directed toward opposite sides of the volute along the impeller axis.

[0014] As a further improvement of one embodiment of the present invention, the volute includes a bottom guide portion and a cover guide portion, the aforementioned bottom guide portion and cover guide portion are disposed on opposite sides of the corresponding channel along the impeller axis, and the aforementioned bottom guide portion and / or cover guide portion are arranged radially inclined relative to the impeller.

[0015] As a further improvement of one embodiment of the present invention, the volute includes a bottom plate and a cover plate opposite to each other along the impeller axis. The bottom plate has a first bottom guide portion located on one side of a first channel, and the cover plate has a second cover guide portion located on one side of a second channel. The first bottom guide portion is inclined relative to the impeller toward the cover plate side, and the second cover guide portion is inclined relative to the impeller toward the bottom plate side.

[0016] As a further improvement of one embodiment of the present invention, the volute includes a first air outlet communicating with the installation space and the first channel, and a second air outlet communicating with the installation space and the second channel, wherein the axis of the first air outlet and the axis of the second air outlet are coplanar.

[0017] As a further improvement of one embodiment of the present invention, the volute includes a bottom plate, a cover plate, and a first side plate and a second side plate located between the bottom plate and the cover plate. The first side plate includes a first volute tongue, and the second side plate includes a second volute tongue. The first air outlet is formed between the first volute tongue and the second side plate, and the second air outlet is formed between the second volute tongue and the first side plate.

[0018] As a further improvement of one embodiment of the present invention, the volute has a drain port communicating with the fan cavity, and the drain port and the second air outlet are disposed on opposite sides of the volute along the radial direction of the impeller.

[0019] As a further improvement of one embodiment of the present invention, the volute includes a bottom shell connected to the impeller, a wire pass-through port communicating with the fan cavity, and a wire harness fixing block. The wire pass-through port is disposed in the bottom shell and is disposed adjacent to the wire harness fixing block.

[0020] To achieve one of the objectives of the above invention, the present invention also provides a freezer, comprising:

[0021] The cabinet includes an inner liner forming a receiving compartment, an outer shell, an insulation cavity formed between the inner liner and the outer shell, and an evaporation cover plate, the evaporation cover plate dividing the receiving compartment into an evaporation cavity and a storage cavity;

[0022] The door is connected to the top of the cabinet.

[0023] As described above, in the centrifugal fan, the air inlet is connected to the evaporation chamber;

[0024] The cabinet includes at least one air duct cover, which together with the inner liner forms a first air duct and a second air duct. The first air duct connects a first air outlet to a storage cavity, and the second air duct connects a second air outlet to a storage cavity.

[0025] As a further improvement of one embodiment of the present invention, the air duct cover plate includes a first air cover plate and a second air cover plate. The first air cover plate and the inner liner together form a first air passage, and the second air cover plate and the inner liner together form a second air passage. The first air cover plate and the second air cover plate are arranged alternately along the axial direction of the impeller.

[0026] As a further improvement of one embodiment of the present invention, at least a portion of the first air passage and / or the second air passage protrudes into the insulation cavity.

[0027] As a further improvement of one embodiment of the present invention, at least a portion of the first air passage and / or the second air passage protrudes into the storage cavity.

[0028] As a further improvement of one embodiment of the present invention, the freezer further includes at least one sealing element, wherein the volute abuts against the evaporator cover plate on one side along the impeller axis, the volute abuts against the inner liner on the opposite side along the impeller axis, and the sealing element is located between the volute and the inner liner.

[0029] As a further improvement of one embodiment of the present invention, the inner liner has a clearance step protruding toward the receiving chamber, the storage cavity includes a first cavity located above the clearance step and a second cavity communicating with the first cavity, the first air passage communicating with the second cavity, and the second air passage communicating with the second cavity; or,

[0030] The second air passage connects the first cavity and the second cavity.

[0031] As a further improvement of one embodiment of the present invention, the cabinet includes two air duct covers, which are symmetrically arranged on both sides of the evaporator cover.

[0032] As a further improvement of one embodiment of the present invention, at least a portion of the first air duct and / or the second air duct is formed by vacuum forming or bending of the inner liner.

[0033] Compared with the prior art, in the embodiments of the present invention, the axis of the first air outlet and the axis of the second air outlet are spaced apart along the axial direction of the impeller, so that the first air outlet and the second air outlet can be staggered along the axial direction of the impeller, thereby removing the restrictions on the installation method of multiple air ducts and meeting the different design requirements of the freezer. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of a centrifugal fan in one aspect of the present invention.

[0035] Figure 2 yes Figure 1 A three-dimensional schematic diagram of a centrifugal fan from another perspective;

[0036] Figure 3 yes Figure 1 A schematic diagram of the cross-section of a centrifugal fan along the Z-axis.

[0037] Figure 4 yes Figure 1 A schematic diagram of the cross-section of a centrifugal fan along the Y-axis.

[0038] Figure 5 yes Figure 1 Exploded view of a centrifugal fan;

[0039] Figure 6 This is a three-dimensional schematic diagram of a freezer according to one embodiment of the present invention;

[0040] Figure 7 yes Figure 6 A cross-sectional diagram of a refrigerated display case along the front-to-back direction;

[0041] Figure 8 yes Figure 6 A cross-sectional view of a refrigerated display case along the left-right direction;

[0042] Figure 9 yes Figure 6 A schematic diagram of another cross-section of the intermediate refrigeration unit along the left-right direction;

[0043] Figure 10 yes Figure 6 Another cross-sectional view of the intermediate refrigeration unit along the front-to-back direction;

[0044] Figure 11 This is an exploded view of the cabinet in one embodiment of the present invention;

[0045] Figure 12 This is an exploded schematic diagram of the inner liner in another embodiment of the present invention. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0047] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0048] refer to Figures 1 to 5 As shown, the centrifugal fan 2 provided in the embodiment of the present invention can be used in a freezer.

[0049] like Figure 1 A centrifugal fan 2 includes a volute 21 and an impeller 22.

[0050] In some embodiments, the impeller 22 is rotatably connected to the volute 21, that is, the impeller 22 can rotate inside the volute 21 after being driven.

[0051] The volute 21 has a fan chamber 211 and an air inlet 212 connected to the fan chamber 211.

[0052] In some embodiments, the fan cavity 211 is formed inside the volute 21 and exposed to the outside through the air inlet 212, that is, external gas can flow into the fan cavity 211 through the air inlet 212.

[0053] The impeller 22 is disposed inside the fan cavity 211.

[0054] In some embodiments, the impeller 22 can rotate within the fan chamber 211, thereby creating a negative pressure in a localized area of ​​the fan chamber 211, allowing external gas to flow into the fan chamber 211 through the air inlet 212.

[0055] The impeller 22 is axially opposite the air inlet 212.

[0056] In some embodiments, such as Figure 1 Impeller 22 and air inlet 212 are opposite each other along the axis L1 of impeller 22.

[0057] In some embodiments, the axis of the impeller 22 is parallel to the axis of rotation of the impeller 22.

[0058] The volute 21 also has a first air outlet 213 and a second air outlet 214 connected to the fan cavity 211.

[0059] In some embodiments, the volute 21 has only two air outlets. Under the action of the impeller 22, the gas in the fan chamber 211 can flow out through the first air outlet 213 and the second air outlet 214.

[0060] In other embodiments, the volute 21 may also have more than two air outlets.

[0061] The first air outlet 213 and the second air outlet 214 are arranged circumferentially around the axis L1 of the impeller 22.

[0062] In some embodiments, external gas flows into the fan chamber 211 from the air inlet 212 along the axis L1 of the impeller 22 (i.e., the axial direction of the impeller 22) and then flows out of the fan chamber 211 in a direction perpendicular to the axis L1 of the impeller 22 (i.e., the radial direction of the impeller 22).

[0063] It should be noted that, as used herein, the terms “axial,” “radial,” and “circumferential” are used with reference to the overall circular and cylindrical shape of the impeller 22 shown. In this sense, “axial” refers to the direction generally along or parallel to the central axis of the circular and cylindrical shape, “radial” refers to the direction generally along or parallel to the radius of the circular and cylindrical shape, and “circumferential” refers to the direction generally along the circumference of the circular and cylindrical shape.

[0064] Reference Figure 2 As shown, the axis L2 of the first air outlet 213 and the axis L3 of the second air outlet 214 are offset along the axial direction of the impeller 22.

[0065] In some embodiments, the axes of the two air outlets are offset or spaced apart from each other. Specifically, the axis of the first air outlet 213 and the axis of the second air outlet 214 neither coincide nor intersect, that is, the plane containing the axis of the first air outlet 213 and the plane containing the axis of the second air outlet 214 are opposite to each other.

[0066] For example, the first air outlet 213 and the second air outlet 214 adopt a rectangular through-hole structure. In this case, the axis of the air outlet is located at the center of the rectangular through-hole, such as the central axis of the air outlet. Figure 2 The corresponding dashed lines L2 and L3 are shown in the figure.

[0067] The axis L2 of the first air outlet 213 and the axis L3 of the second air outlet are spaced apart along the axis L1 of the impeller 22, so that the first air outlet 213 and the second air outlet 214 are staggered along the axis L1 of the impeller 22, thereby removing the restrictions on the installation method of multiple air ducts and meeting the different design requirements of the freezer.

[0068] The first air outlet 213 and the second air outlet 214 are arranged alternately along the axis L1 of the impeller 22. As long as the two air outlets are partially staggered, it can include cases where the cross-sectional thicknesses of the two air outlets are the same or different.

[0069] The axis (L2, L3) of at least one air outlet (213, 214) extends radially along the impeller 22.

[0070] In some embodiments, the airflow direction from the air outlet (213, 214) is parallel to the axis of the air outlet (213, 214).

[0071] In this embodiment, after the axis of the air outlet (i.e., the first air outlet 213 and / or the second air outlet 214) is parallel to or approximately parallel to the radial direction of the impeller 22, the airflow direction from the air outlet (213, 214) is also parallel to or approximately parallel to the radial direction of the impeller 22.

[0072] Thus, after the centrifugal fan 2 is connected to multiple air covers of the freezer, at least one air cover is parallel or approximately parallel to the radial direction of the impeller 22, which can save the space occupied by the air duct cover along the axial direction of the impeller 22.

[0073] For example, the axes of the first air outlet 213 and the second air outlet 214 are both parallel to the radial direction of the impeller 22.

[0074] The plane containing the axis L2 of the first air outlet 213 is parallel to the plane containing the axis L3 of the second air outlet 214.

[0075] In some embodiments, the axis L2 of the first air outlet 213 and the axis L3 of the second air outlet 214 are located on two mutually parallel planes.

[0076] In this embodiment, the planes containing the axes of the two air outlets (213, 214) are parallel to each other, which facilitates the docking of the two air outlets (213, 214) with two parallel air cover plates. For example, it facilitates docking with two air cover plates located on the same wall surface of the inner liner (e.g., the rear wall of the inner liner).

[0077] In other embodiments, the plane containing the axis L2 of the first air outlet 213 intersects the plane containing the axis L3 of the second air outlet 214 but are not on the same plane.

[0078] The first air outlet 213 is opposite to the impeller 22 along the first direction.

[0079] In some embodiments, the axis L2 of the first air outlet 213 extends along a first direction.

[0080] The second air outlet 214 is opposite to the impeller 22 along the second direction.

[0081] In some embodiments, the axis L3 of the second air outlet 214 extends along the second direction.

[0082] Both the first direction and the second direction are perpendicular to the axis of the impeller 22.

[0083] In some embodiments, both the first direction and the second direction extend radially along the impeller 22.

[0084] The first direction and the second direction are set at a certain angle.

[0085] In some embodiments, the angle between the first direction and the second direction can be a spatial angle. The angle between the two can be any angle greater than 0°.

[0086] In this embodiment, compared to the solution where "the angle between the first direction and the second direction is 0°", this solution can reduce airflow interference between the two air outlets, thereby reducing mutual interference between the airflows inside the two paths, and also facilitating the setting of the volute tongue.

[0087] In this embodiment, compared to the solution where "the two air outlets are opposite each other along the radial direction of the impeller 22, that is, the angle between the first direction and the second direction is 180°", the angle between the first direction and the second direction is between 0° and 180°, which can save the space occupied by the volute 21 along the first direction or the second direction.

[0088] For example, the axis of impeller 22 is parallel to Figure 1 The X-axis direction in the diagram, the first direction is Figure 1 The Y-axis direction, the second direction is Figure 1 The Z-axis direction in the diagram. The angle between the first direction and the second direction is 90°.

[0089] Reference Figure 3 As shown, the fan cavity 211 has an installation space 2111 for accommodating the impeller 22.

[0090] In some embodiments, the mounting space 2111 is matched with the external dimensions of the impeller 22, and the air inlet 212 is connected to the mounting space 2111. After the impeller 22 rotates within the mounting space 2111, it can create a local negative pressure within the mounting space 2111.

[0091] The fan cavity 211 has a first channel 2112 that connects the installation space 2111 and the first air outlet 213.

[0092] In some embodiments, the installation space 2111 and the first air outlet 213 are interconnected by a first channel 2112. That is, the gas in the installation space 2111 flows through the first channel 2112 to the first air outlet 213 and flows out from the first air outlet 213.

[0093] Reference Figure 4 As shown, the fan cavity 211 has a second channel 2113 that connects the installation space 2111 and the second air outlet 214.

[0094] In some embodiments, the installation space 2111 and the second air outlet 214 are interconnected by a second channel 2113. That is, the gas in the installation space 2111 flows through the second channel 2113 to the second air outlet 214 and flows out from the second air outlet 214.

[0095] The gas flow direction in at least one channel (2112, 2113) is set at an angle of 0° to 90° with the radial direction of the impeller 22.

[0096] In some embodiments, by adjusting the tilt angle of the channels (i.e., the first channel 2112 and / or the second channel 2113) relative to the radial direction of the impeller 22, the angle between the gas flow direction in the channels (2112, 2113) and the radial direction of the impeller 22 is changed, thereby facilitating the two air outlets (213, 214) to be staggered along the axis L1 of the impeller 22.

[0097] Furthermore, this method also makes it easy to ensure that the planes containing the axes of the two air outlets (213, 214) are parallel to each other.

[0098] In this embodiment, the gas flow direction in the channel (2112, 2113) is set at a certain angle to the gas flow direction of the corresponding air outlet (213, 214), that is, it is set at a certain angle to the axis of the corresponding air outlet (213, 214).

[0099] Compared to the solution of "changing the orientation of the two air outlets (213, 214) to achieve the offset of the axes", changing the tilt direction of the channels (2112, 2113) will not affect the internal structure of the installation space 2111, thus avoiding turbulence in the installation space 2111.

[0100] For example, such as Figure 3 The gas inside the installation space 2111 is transported to the first channel 2112 by the impeller 22, and then flows along the first channel 2112, that is, along the auxiliary line L4, and then flows out along the axis L2 of the first air outlet 213. The angle between L4 and L2 is set from 0° to 90°.

[0101] For example, such as Figure 4 The gas inside the installation space 2111 is transported to the second channel 2113 by the impeller 22, and then flows along the second channel 2113, that is, along the auxiliary line L5, and then flows out along the axis L3 of the second air outlet 214. The angle between L5 and L3 is set between 0° and 90°.

[0102] The gas flow direction in the first channel 2112 and the gas flow direction in the second channel 2113 are respectively directed toward the opposite sides of the volute 21 along the axial direction of the impeller 22.

[0103] In some embodiments, such as Figure 3 The gas flow direction within the first channel 2112 is towards the side of the volute 21 with the air inlet 212, for example... Figure 1 The positive direction of the X-axis. For example... Figure 4 The gas flow direction in the second channel 2113 is towards the side of the volute 21 away from the air inlet 212, for example... Figure 1 The negative direction of the X-axis.

[0104] In this embodiment, compared to the scheme in which "the gas flow direction in the first channel 2112 and the second channel 2113 is towards the same side of the volute 21", this scheme can increase the spacing between the two air outlets (213, 214) along the axial direction of the impeller 22.

[0105] In this embodiment, compared to the solution where "the gas flow direction in the first channel 2112 or the second channel 2113 is towards one side of the volute 21", this solution can increase the spacing between the two air outlets (213, 214) along the impeller axis.

[0106] In other embodiments, the gas flow direction in either the first channel 2112 or the second channel 2113 may be directed toward one side of the volute 21, or the gas flow direction in both the first channel 2112 and the second channel 2113 may be directed toward the same side of the volute 21.

[0107] The volute 21 includes a bottom guide portion (21511, 21512) and a top guide portion (21611, 21612).

[0108] In some embodiments, the volute 21 includes a first bottom guide portion 21511, a second bottom guide portion 21512, and a first cover guide portion 21611 and a second cover guide portion 21612.

[0109] The aforementioned bottom guide section (21511, 21512) and cover guide section (21611, 21612) are disposed on opposite sides of the corresponding channel (2112, 2113) along the axial direction of the impeller 22.

[0110] In some embodiments, such as Figure 3 The first bottom guide section 21511 and the first cover guide section 21612 are disposed on opposite sides of the first channel 2112 along the axial direction of the impeller 22.

[0111] In some embodiments, such as Figure 4 The second bottom guide section 21512 and the second cover guide section 21612 are disposed on opposite sides of the second channel 2113 along the axial direction of the impeller 22.

[0112] The aforementioned bottom guide section (21511, 21512) and / or cover guide section (21611, 21612) are arranged radially inclined relative to the impeller 22.

[0113] In this embodiment, by changing the tilt angle of the first bottom guide section 21511 and / or the first cover guide section 21612 relative to the radial direction of the impeller 22, the angle between the airflow direction in the first channel 2112 and the radial direction of the impeller 22 can be changed.

[0114] In this embodiment, by changing the tilt angle of the second bottom guide section 21512 and / or the second cover guide section 21612 relative to the radial direction of the impeller 22, the angle between the airflow direction in the second channel 2113 and the radial direction of the impeller 22 can be changed.

[0115] Reference Figure 5 As shown, the volute 21 includes a base plate 2151 and a cover plate 2161 that are axially opposite to each other along the impeller 22.

[0116] In some embodiments, a base plate 2151 and a cover plate 2161 are disposed on opposite sides of the impeller 22 along the axial direction. The impeller 22 is connected to the base plate 2151, and an air inlet 212 is formed on the cover plate 2161.

[0117] In this embodiment, the base plate 2151 has a mounting surface 21513 facing away from the impeller 22. After the centrifugal fan 2 is installed, the mounting surface 21513 is attached to the inner wall of the inner liner.

[0118] The base plate 2151 has a first bottom guide portion 21511 located on one side of the first channel 2112.

[0119] In some embodiments, a first bottom guide portion 21511 is disposed on a base plate 2151 such that the first bottom guide portion 21511 is located on the side of the first channel 2112 away from the air inlet 212 along the impeller 22 axial direction.

[0120] The cover plate 2161 has a second cover guide portion 21612 located on one side of the second channel 2113.

[0121] In some embodiments, a second cover guide portion 21612 is disposed on a cover plate 2161 such that the second cover guide portion 21612 is located on the side of the second channel 2113 facing the air inlet 212 along the impeller 22 axial direction.

[0122] The first bottom guide section 21511 is inclined relative to the impeller 22 toward the cover plate 2161.

[0123] In some embodiments, the first bottom guide portion 21511 is inclined toward the side of the cover plate 2161, that is, inclined toward the side away from the mounting surface 21513. This can prevent the first bottom guide portion 21511 from protruding from the mounting surface 21513, ensuring that the mounting surface 21513 is flat, which is beneficial to the installation of the centrifugal fan 2.

[0124] Furthermore, by utilizing the inclined arrangement of the first bottom guide portion 21511, the airflow direction in the first channel 2112 can be directed toward the side of the volute 21 with the air inlet 212.

[0125] In this embodiment, the first cover guide portion 21611 is tilted toward the side away from the mounting surface 21513, so that the airflow direction in the first channel 2112 is toward the side of the volute 21 with the air inlet 212.

[0126] Furthermore, the first cover guide portion 21611 is inclined toward the side away from the mounting surface 21513, which can also prevent the first cover guide portion 21611 from protruding from the mounting surface 21513, ensuring that the mounting surface 21513 is flat, which is beneficial to the installation of the centrifugal fan 2.

[0127] The second cover guide portion 21612 is inclined relative to the impeller 22 toward the side facing the base plate 2151.

[0128] In some embodiments, by simply using the second cover guide portion 21612 to be tilted toward the side of the base plate 2151, the airflow direction in the second channel 2113 can be directed toward the side of the volute 21 away from the air inlet 212, thus reducing the manufacturing difficulty of the second channel 2113.

[0129] In this embodiment, the second bottom guide portion 21512 extends radially along the impeller 22, which can prevent the second bottom guide portion 21512 from protruding from the mounting surface 21513, ensuring that the mounting surface 21513 is flat, which is beneficial to the installation of the centrifugal fan 2.

[0130] The volute 21 includes a first air outlet 2114 that connects the installation space 2111 and the first channel 2112.

[0131] In some embodiments, the installation space 2111 and the first channel 2112 are interconnected by a first air outlet 2114. That is, the gas in the installation space 2111 flows to the first channel 2112 through the first air outlet 2114, and then flows from the first channel 2112 to the first air outlet 213.

[0132] The volute 21 includes a second air outlet 2115 that connects the installation space 2111 and the second channel 2113.

[0133] In some embodiments, the installation space 2111 and the second channel 2113 are interconnected by a second air outlet 2115. That is, the gas in the installation space 2111 flows to the second channel 2113 through the second air outlet 2115, and then flows from the second channel 2113 to the second air outlet 214.

[0134] The axis of the first air outlet 2114 is coplanar with the axis of the second air outlet 2115.

[0135] In some embodiments, the axes of the two outlets (2114, 2115) are coplanar, that is, the axes of the two outlets (2114, 2115) are both perpendicular to the axis L1 of the impeller 22. This can prevent the gas in the installation space 2111 from changing direction when it flows out from different outlets, and allow the airflow in the installation space 2111 to flow out smoothly from the two outlets (2114, 2115), reducing turbulence.

[0136] In this embodiment, the two air outlets (2114, 2115) are formed by the opposing base plate 2151 and cover plate 2161, so the axes of the two air outlets (2114, 2115) are coplanar.

[0137] For example, two air outlets (2114, 2115) are arranged circumferentially around the axis L1 of the impeller 22. The plane containing the axes of the air outlets (2114, 2115) is skew to the plane containing the axes of the corresponding air outlets (213, 214). Two channels (2112, 2113) are arranged radially inclined relative to the impeller 22, thereby achieving interconnection between the air outlets (2114, 2115) and the corresponding air outlets (213, 214).

[0138] Continue to cooperate with reference Figure 5 As shown, the volute 21 includes a first side plate 2152 and a second side plate 2153 located between the bottom plate 2151 and the cover plate 2161.

[0139] In some embodiments, the first side plate 2152 and the second side plate 2153 are connected to the bottom plate 2151, and the bottom plate 2151 and the two side plates (2152, 2153) together form the bottom shell 215.

[0140] In some embodiments, the volute 21 further includes a snap-fit ​​plate 2162 connected to the cover plate 2161, and the cover plate 2161 and the snap-fit ​​plate 2162 together form the cover 216.

[0141] For example, the two side plates (2152, 2153) are snapped together with the snap-fit ​​plate 2162 to achieve the interconnection between the base plate 2151 and the cover plate 2161. The two side plates (2152, 2153) are integrally formed with the base plate 2151, and the cover plate 2161 is integrally formed with the snap-fit ​​plate 2162.

[0142] The first side plate 2152 includes a first volute tongue 21521, and the second side plate 2153 includes a second volute tongue 21531.

[0143] In some embodiments, a first volute tongue 21521 and a second volute tongue 21531 are sequentially arranged along the rotation direction of the impeller 22. The volute tongues (21521, 21531) are located at the corresponding air outlets (2114, 2115) and can smoothly guide the airflow from the impeller 22 to the air outlets (2114, 2115), reducing turbulence and energy loss.

[0144] The first air outlet 2114 is formed between the first volute tongue 21521 and the second side plate 2153.

[0145] In some embodiments, at least a portion of the first volute tongue 21521 and the second side plate 2153 are disposed opposite each other along a direction perpendicular to the axis of the first air outlet 213, thereby forming a first air outlet 2114.

[0146] The second air outlet 2115 is formed between the second volute tongue 21531 and the first side plate 2152.

[0147] In some embodiments, the second volute 21531 and at least a portion of the first side plate 2152 are disposed opposite each other along a direction perpendicular to the axis of the second air outlet 214, thereby forming a second air outlet 2115.

[0148] The volute 21 has a drain outlet 217 that communicates with the fan cavity 211.

[0149] In some embodiments, the defrosting water formed after defrosting the centrifugal fan 2 can flow out of the fan cavity 211 through the drain 217, avoiding secondary icing and affecting the normal operation of the centrifugal fan 2.

[0150] The drain outlet 217 and the second air outlet 214 are located on opposite sides of the volute 21 along the radial direction of the impeller 22.

[0151] In some embodiments, the drain outlet 217 is located on the side away from the second air outlet 214, which can avoid the impact of the drain outlet 217 on the second air outlet 214 when discharging defrost water.

[0152] For example, the drain outlet 217 extends through the second side plate 2153, the cover plate 2161 and the snap-fit ​​plate 2162, thereby enabling communication with the fan cavity 211.

[0153] For example, after the centrifugal fan 2 is installed in the freezer, the second air outlet 214 is located at the top of the volute 21 and the drain outlet 217 is located at the bottom of the volute 21, which facilitates the defrosting water in the fan cavity 211 to be discharged from the drain outlet 217 by its own gravity.

[0154] Reference Figure 2 As shown, the volute 21 includes a bottom shell 215 that connects to the impeller 22.

[0155] In some embodiments, the bottom shell 215 is composed of a bottom plate 2151 and two side plates (2152, 2153), and the impeller 22 is connected to the bottom plate 2151.

[0156] The volute 21 includes a wire through-hole 218 that communicates with the fan cavity 211.

[0157] In some embodiments, after the wiring harness is connected to the impeller 22, it can extend out of the fan cavity 211 from the wire insertion port 218, thereby connecting to an external power supply or control module.

[0158] The volute 21 includes a wire harness fixing block 219.

[0159] In some embodiments, after the wire harness extends out of the fan cavity 211 from the wire insertion port 218, it can be wrapped and fixed to the wire harness fixing block 219 to prevent the wire harness from shaking.

[0160] The threading port 218 is located on the bottom shell 215.

[0161] In some embodiments, the wire pass 218 extends through the base plate 2151 and / or the side plates (2152, 2153). The wire pass 218 extends through the base plate 2151, that is, the impeller 22 and the wire pass 218 are axially opposite each other, which can shorten the wire harness length between the impeller 22 and the wire pass 218.

[0162] The threading port 218 is arranged adjacent to the wire harness fixing block 219.

[0163] In some embodiments, the wire pass-through port 218 is disposed adjacent to the wire harness fixing block 219, which can shorten the wire harness length between the wire pass-through port 218 and the wire harness fixing block 219. The wire harness fixing block 219 is located on the outside of the volute 21, for example, on the mounting surface 21513 of the base plate 2151.

[0164] According to another aspect of the present invention, a freezer is also provided, the freezer being provided with a centrifugal fan 2 according to the present invention.

[0165] refer to Figures 6 to 12 As shown, an embodiment of the present invention provides a freezer, which is configured as a horizontal air-cooled freezer.

[0166] like Figure 6As shown, a freezer includes a cabinet body 1 and a door body, wherein the door body is connected to the top of the cabinet body 1.

[0167] In some embodiments, the door is pivotally connected to the top of the cabinet 1, allowing the user to open or close the receiving compartment from the top of the cabinet 1 for retrieval and placement operations. The pivot hinge connecting the cabinet 1 and the door may be located at the rear of the top of the cabinet 1.

[0168] In some embodiments, the freezer also includes a refrigeration system, which includes a compressor, a condenser, a capillary tube, an evaporator, etc. These components are connected by pipes to form a refrigeration circuit, and the cooling capacity generated by the evaporator can provide cooling for the storage compartment.

[0169] Reference Figure 7 As shown, the cabinet 1 includes an inner liner 11 forming a receiving chamber 111, an outer shell 12, and an insulation cavity 13 formed between the inner liner 11 and the outer shell 12.

[0170] In some embodiments, the accommodating chamber 111 is formed by an inner liner 11, which may be integrally molded, for example, by injection molding.

[0171] In other embodiments, the inner liner 11 may also be formed in parts, such as by splicing together components of the same or different materials.

[0172] In some embodiments, by filling the insulation cavity 13 with insulation material, the accommodating chamber 111 is insulated, thereby reducing heat exchange with the external environment.

[0173] Cabinet 1 includes evaporator cover 14.

[0174] In some embodiments, the evaporator cover 14 is connected to the inner liner 11, for example, to the bottom wall of the inner liner 11. The evaporator cover 14 is located within the receiving chamber 111.

[0175] The evaporation cover 14 divides the receiving chamber 111 into an evaporation chamber 1111 and a storage chamber 1112.

[0176] In some embodiments, an evaporator and / or an evaporation fan are provided in the evaporation chamber 1111. Users can place the items they wish to store in the storage chamber 1112.

[0177] The cabinet 1 includes a centrifugal fan 2, and the air inlet 212 is connected to the evaporation chamber 1111.

[0178] In some embodiments, the air inlet 212 and the evaporation chamber 1111 are axially opposite to each other along the impeller 22, for example, in the front-to-back direction.

[0179] The cabinet 1 includes at least one air duct cover 15.

[0180] In some embodiments, the air duct cover 15 is connected to the inner liner 11 and is located within the storage cavity 1112.

[0181] Reference Figure 8 As shown, the air duct cover 15 and the inner liner 11 together form a first air passage 1113 and a second air passage 1114.

[0182] In some embodiments, the first air passage 1113 and the second air passage 1114 are disposed on the same inner wall of the inner liner 11, for example, both are disposed on the rear wall 117 of the inner liner 11. This facilitates the connection between the two air outlets (213, 214) and the corresponding two air passages (1113, 1114).

[0183] The first air passage 1113 connects the first air outlet 213 and the storage cavity 1112.

[0184] In some embodiments, the airflow in the evaporation chamber 1111 flows into the fan chamber 211 through the air inlet 212, then flows into the first air path 1113 through the first air outlet 213, and then flows into the storage chamber 1112 through the first air path 1113.

[0185] The second air passage 1114 connects the second air outlet 214 and the storage cavity 1112.

[0186] In some embodiments, the airflow in the evaporation chamber 1111 flows into the fan chamber 211 through the air inlet 212, then flows into the second air path 1114 through the second air outlet 214, and then flows into the storage chamber 1112 through the second air path 1114.

[0187] For example, the first direction is parallel to Figure 6 The left and right directions, the second direction is parallel to Figure 6 In the vertical direction, the axial direction of impeller 22 is parallel to... Figure 6 The front and rear directions are as follows. The first air outlet 213 is located at the top of the volute 21, and the second air outlet is located on the left side of the volute 21.

[0188] The air duct cover 15 includes a first air cover 151 and a second air cover 152.

[0189] In some embodiments, the first air passage 1113 and the second air passage 1114 are respectively formed by different air covers (151, 152) and the inner liner 11 to avoid mutual interference between the two air passages (1113, 1114).

[0190] The first air cover 151 and the inner liner 11 together form a first air passage 1113, and the second air cover 152 and the inner liner 11 together form a second air passage 1114.

[0191] In some embodiments, the air passage (1113, 1114) is formed by an opposing air passage groove and an air passage cover. One of the air passage groove and the air passage cover is formed in the cover plate (151, 152), and the other of the air passage groove and the air passage cover is formed in the inner liner 11.

[0192] In other embodiments, the air duct (1113, 1114) is formed by two opposing air duct channels. One air duct channel is formed in the cover plate (151, 152), and the other air duct channel is formed in the inner liner 11.

[0193] The air duct groove is recessed into the end face of the cover plate (151, 152) and / or the inner liner 11.

[0194] The first air cover plate 151 and the second air cover plate 152 are arranged alternately along the axial direction of the impeller 22.

[0195] In some embodiments, the first air passage 1113 and the second air passage 1114 are arranged alternately along the axial direction of the impeller 22, so as to facilitate direct connection with the corresponding air outlets (213, 214) without the need for additional steering components to redirect the airflow.

[0196] For example, the first air cover 151 and the evaporator cover 14 are located below the second air cover 152, and the first air cover 151 is located to the left of the evaporator cover 152.

[0197] At least a portion of the first air passage 1113 and / or the second air passage 1114 protrudes into the insulation cavity 13.

[0198] In some embodiments, part or all of the air ducts (1113, 1114) protrude into the insulation cavity 13. Under the same conditions, this reduces the space occupied by the air ducts (1113, 1114) in the storage cavity 1112, thereby saving the space occupied by the cover plates (151, 152) in the storage cavity 1112.

[0199] For example, the second air passage 1114 extends entirely into the insulation cavity 13, that is, the air passage groove is formed in the inner liner 11. After the second air passage groove is covered by a flat second air cover 152, the second air passage 1114 can be formed.

[0200] At least a portion of the first air passage 1113 and / or the second air passage 1114 protrudes into the storage cavity 1112.

[0201] In some embodiments, part or all of the air ducts (1113, 1114) protrude into the storage cavity 1112, which, under the same conditions, reduces the space occupied by the air ducts (1113, 1114) in the insulation cavity 13.

[0202] Furthermore, the corresponding inner liner 11 only needs to adopt a flat plate structure to form the air passage (1113, 1114), which reduces the manufacturing difficulty of the inner liner 11.

[0203] In addition, the cover plates (151, 152) protruding into the storage cavity 1112 can also be used to support the storage basket.

[0204] For example, the first air passage 1113 extends entirely into the storage cavity 1112, that is, the air passage groove is formed in the first air cover plate 151, and the first air passage 1113 is formed by covering the air passage groove with a flat inner liner 11.

[0205] In other embodiments, besides adopting the above-mentioned scheme of "the first air passage 1113 protruding into the storage cavity 1112 and the second air passage 1114 protruding into the insulation cavity 13", it can also be "the first air passage 1113 protruding into the insulation cavity 13 and the second air passage 1114 protruding into the storage cavity 1112", "both the first air passage 1113 and the second air passage 1114 protruding into the insulation cavity 13", "both the first air passage 1113 and the second air passage 1114 protruding into the storage cavity 1112", or "both the first air passage 1113 and the second air passage 1114 protruding into the storage cavity 1112 and the insulation cavity 13". This is as long as the first air cover 151 and the second air cover 152 are staggered along the axial direction of the impeller 22.

[0206] Reference Figure 2 As shown, the freezer also includes at least one seal (3, 4).

[0207] In some embodiments, the seals (i.e., the first seal 3 and / or the second seal 4) are configured as foam and fixed by adhesive bonding, thereby reducing manufacturing costs.

[0208] Reference Figure 9 As shown, the volute 21 abuts against the evaporator cover plate 14 on one side along the axial direction of the impeller 22.

[0209] In some embodiments, a positioning groove is provided on the volute 21 (i.e., cover 216) to achieve positioning and installation with the end (i.e., rear end) of the evaporator cover plate 14. Thus, after the evaporator cover plate 14 and the volute 21 are axially aligned with the impeller 22, the radial offset of the evaporator cover plate 14 and the volute 21 along the impeller 22 is restricted.

[0210] The volute 21 abuts against the inner liner 11 on the opposite side along the axial direction of the impeller 22.

[0211] In some embodiments, by providing a positioning boss on the volute 21 (i.e., bottom shell 215) and a limiting groove on the inner liner 11, the positioning boss extends into the limiting groove along the impeller 22 axially, thereby limiting the evaporator cover plate 14 and the volute 21 to offset radially along the impeller 22.

[0212] Furthermore, the volute 21 abuts against the evaporator cover 14 and the inner liner 11 on opposite sides along the axial direction of the impeller 22, which can limit the centrifugal fan 2 from shifting along the axial direction of the impeller 22.

[0213] The sealing elements (3, 4) are located between the volute 21 and the inner liner 11.

[0214] In some embodiments, the seal (3, 4) is connected to one of the inner liner 11 (e.g., rear wall 117) and the volute 21 (i.e., bottom shell 215), and abuts against the other of the inner liner 11 and the volute 21.

[0215] For example, such as Figure 2 A first mounting groove and a second mounting groove are provided on the volute 21 (i.e., the bottom shell 215). The first mounting groove is located at the first air outlet 213, and the second mounting groove is located at the second air outlet 214. The first sealing element 3 is fixed in the first mounting groove, and the second sealing element 4 is fixed in the second mounting groove, thereby improving the sealing performance of the centrifugal fan 2 at the two air outlets (213, 214).

[0216] The inner liner 11 has a clearance step 112 that protrudes toward the receiving compartment 111.

[0217] In some embodiments, the housing 12 has a compressor compartment 121 located below the clearance step 112, and the compressor and / or condenser are located within the compressor compartment 121.

[0218] The storage cavity 1112 includes a first cavity 11121 located above the step 112 and a second cavity 11122 connected to the first cavity 11121.

[0219] In some embodiments, such as Figure 10 As shown, the first cavity 11121 is located directly above the clearance step 111 (i.e., the press chamber 121).

[0220] In some embodiments, the second cavity 11122 is located to the left of the first cavity 11121.

[0221] For example, the first cavity 11121 and the second cavity 11122 are located on both sides of the dashed line L6.

[0222] The first air passage 1113 is connected to the second cavity 11122, and the second air passage 1114 is connected to the second cavity 11122.

[0223] In some embodiments, considering that the volume of the second cavity 11122 is larger than that of the first cavity 11121, the first air passage 1113 and the second air passage 1114 are both connected to the second cavity 11122, which can improve the cooling efficiency of the second cavity 11122.

[0224] In this embodiment, the second air passage 1114 is only connected to the second cavity 11122, which can reduce the manufacturing difficulty of the second air cover 152. Furthermore, since the second air cover 152 does not need to be connected to the first enclosure, the manufacturing difficulty of the first enclosure can also be reduced.

[0225] For example, since the second air passage 1114 is only connected to the second cavity 11122, the second air cover 152 can be in the shape of an "L".

[0226] In addition, a guide 5 can be provided on the second air cover 152 to cool the first cavity 11121, thereby improving the uniformity of cooling in all parts of the storage cavity 1112.

[0227] The second air passage 1114 connects to the first cavity 11121 and the second cavity 11122.

[0228] In other embodiments, the second air passage 1114 is connected to both the first cavity 11121 and the second cavity 11122, which can ensure the cooling efficiency of the second cavity 11122 while improving the cooling efficiency of the first cavity 11121 and improving the uniformity of cooling in all parts of the storage cavity 1112.

[0229] For example, since the second air passage 1114 is connected to both the first cavity 11121 and the second cavity 11122, the second air cover 152 can be in the shape of a "T".

[0230] The cabinet 1 includes two air duct covers 15.

[0231] In some embodiments, the two duct covers 15 can be configured with different duct covers, for example, one of them can be configured as a supply air duct cover and the other as a return air duct cover.

[0232] In other embodiments, the two duct covers 15 can be configured with identical duct covers, for example, both can be configured as supply air duct covers, or both can be configured as return air duct covers. In this case, the freezer can achieve front and rear dual air supply by setting two centrifugal fans 2.

[0233] Reference Figure 11 As shown, two air duct covers 15 are symmetrically arranged on both sides of the evaporator cover 14.

[0234] In some embodiments, the two air duct covers 15 are symmetrically arranged, which can improve the uniformity of cooling in all parts of the storage cavity 1112 and ensure the cooling effect in all parts of the storage cavity 1112.

[0235] In some embodiments, the two duct covers 15 adopt the same structure, which can also simplify the structure of the cabinet 1.

[0236] For example, the cabinet 1 consists of only two air duct covers 15. The air duct cover 15, which serves as the air supply duct cover, is located on the rear side of the storage cavity 1112 to achieve rear air supply. The air duct cover 15, which serves as the air return duct cover, is located on the front side of the storage cavity 1112 to achieve front air return.

[0237] Continue to cooperate with reference Figure 11 As shown, the inner liner 11 includes a first enclosure 115 and a second enclosure 116.

[0238] In some embodiments, the first enclosure 115 and the second enclosure 116 may be manufactured in a one-piece molding manner.

[0239] For example, the first panel 115 and / or the second panel 116 are made of plastic material. The first panel 115 and / or the second panel 116 are manufactured by vacuum forming, thereby reducing manufacturing costs.

[0240] At least a portion of the first air passage 1113 and / or the second air passage 1114 is formed by thermoforming the inner liner 11.

[0241] In this embodiment, at least a portion of the first air duct 1113 and / or the second air duct 1114 is formed by thermoforming of the corresponding enclosure panels (115, 116).

[0242] For example, after the air duct 113 is formed on the second enclosure 116 by vacuum forming, the second air cover 152 is used to cover the air duct 113, thereby forming the second air duct 1114.

[0243] Reference Figure 12 As shown, the first enclosure 115 and / or the second enclosure 116 are made of metal. The first enclosure 115 and / or the second enclosure 116 are made by bending and forming process, which improves the working strength of the inner liner 11, for example, it is not easy to deform when exposed to the sun for a long time.

[0244] In some embodiments, the inner liner also includes an evaporation base plate 114, which together with the evaporation cover plate 14 forms an evaporation chamber 1111.

[0245] In this embodiment, the first enclosure plate 115 and the second enclosure plate 116 are respectively inserted into the opposite sides of the evaporation base plate 114.

[0246] In some embodiments, the first enclosure plate 115 and the second enclosure plate 116 are connected to the evaporation base plate 114 by plugging in, which facilitates the docking between the enclosure plate and the evaporation base plate 114 and reduces the assembly difficulty.

[0247] In some embodiments, the first enclosure 115 and the second enclosure 116 are located on opposite sides of the evaporation base plate 114. Considering that the evaporation base plate 114 is manufactured by vacuum forming, it is only necessary to provide an insertion structure (e.g., insertion groove) on opposite sides of the evaporation base plate 114 to achieve insertion with the two enclosures, which reduces the manufacturing difficulty of the inner liner 11.

[0248] For example, the first enclosure 115 is inserted into the right end of the evaporation base plate 114, and the clearance step 115 is formed in the first enclosure 115. The second enclosure 116 is inserted into the left end of the evaporation base plate 114.

[0249] At least a portion of the first air passage 1113 and / or the second air passage 1114 is formed by bending the inner liner 11.

[0250] In this embodiment, at least a portion of the first air passage 1113 and / or the second air passage 1114 is formed by bending the corresponding enclosure (115, 116).

[0251] For example, after the air duct 113 is formed on the first enclosure 115 and the second enclosure 116 by vacuum forming, the air duct cover 15 is used to cover the air duct 113, thereby forming the first air duct 1113 and the second air duct 1114.

[0252] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0253] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A centrifugal fan (2), characterized in that, include: The volute (21) has a fan chamber (211) and an air inlet (212) communicating with the fan chamber (211); Impeller (22), the impeller (22) is disposed in the fan cavity (211) and is axially opposite to the air inlet (212); The volute (21) also has a first air outlet (213) and a second air outlet (214) connected to the fan cavity (211). The first air outlet (213) and the second air outlet (214) are arranged circumferentially around the axis of the impeller (22). The axis of the first air outlet (213) and the axis of the second air outlet (214) are offset along the axis of the impeller (22).

2. The centrifugal fan (2) as described in claim 1, characterized in that, The axis of at least one air outlet (213, 214) extends radially along the impeller (22).

3. The centrifugal fan (2) as described in claim 1, characterized in that, The plane containing the axis of the first air outlet (213) is parallel to the plane containing the axis of the second air outlet (214).

4. The centrifugal fan (2) as described in claim 1, characterized in that, The first air outlet (213) is opposite to the impeller (22) along the first direction, and the second air outlet (214) is opposite to the impeller (22) along the second direction. Both the first and second directions are perpendicular to the axis of the impeller (22), and the first and second directions are set at a certain angle.

5. The centrifugal fan (2) as described in claim 1, characterized in that, The fan chamber (211) has an installation space (2111) for accommodating the impeller (22), a first channel (2112) connecting the installation space (2111) and the first air outlet (213), and a second channel (2113) connecting the installation space (2111) and the second air outlet (214). The gas flow direction in at least one channel (2112, 2113) is set at an angle of 0° to 90° with the radial direction of the impeller (22).

6. The centrifugal fan (2) as described in claim 5, characterized in that, The gas flow direction in the first channel (2112) and the gas flow direction in the second channel (2113) are respectively directed toward the opposite sides of the volute (21) along the axial direction of the impeller (22).

7. The centrifugal fan (2) as described in claim 5, characterized in that, The volute (21) includes a bottom guide section (21511, 21512) and a cover guide section (21611, 21612). The bottom guide section (21511, 21512) and the cover guide section (21611, 21612) are disposed on opposite sides of the corresponding channel (2112, 2113) along the axial direction of the impeller 22. The bottom guide section (21511, 21512) and / or the cover guide section (21611, 21612) are arranged radially inclined relative to the impeller (22).

8. The centrifugal fan (2) as described in claim 7, characterized in that, The volute (21) includes a base plate (2151) and a cover plate (2161) that are axially opposite to the impeller (22). The base plate (2151) has a first bottom guide portion (21511) located on one side of the first channel (2112), and the cover plate (2161) has a second cover guide portion (21612) located on one side of the second channel (2113). The first bottom guide portion (21511) is inclined relative to the impeller (22) towards the cover plate (2161), and the second cover guide portion (21612) is inclined relative to the impeller (22) towards the base plate (2151).

9. The centrifugal fan (2) as described in claim 5, characterized in that, The volute (21) includes a first air outlet (2114) connecting the installation space (2111) and the first channel (2112) and a second air outlet (2115) connecting the installation space (2111) and the second channel (2113), wherein the axis of the first air outlet (2114) and the axis of the second air outlet (2115) are coplanar.

10. The centrifugal fan (2) as described in claim 9, characterized in that, The volute (21) includes a base plate (2151), a cover plate (2161), and a first side plate (2152) and a second side plate (2153) located between the base plate (2151) and the cover plate (2161). The first side plate (2152) includes a first volute tongue (21521), and the second side plate (2153) includes a second volute tongue (21531). The first air outlet (2114) is formed between the first volute tongue (21521) and the second side plate (2153), and the second air outlet (2115) is formed between the second volute tongue (21531) and the first side plate (2152).

11. The centrifugal fan (2) as described in claim 1, characterized in that, The volute (21) has a drain outlet (217) connected to the fan chamber (211), and the drain outlet (217) and the second air outlet (214) are located on opposite sides of the volute (21) along the radial direction of the impeller (22).

12. The centrifugal fan (2) as described in claim 1, characterized in that, The volute (21) includes a bottom shell (215) that connects to the impeller (22), a wire hole (218) that communicates with the fan chamber (211), and a wire harness fixing block (219). The wire hole (218) is located on the bottom shell (215) and is located adjacent to the wire harness fixing block (219).

13. A freezer, characterized in that, include: The cabinet (1) includes an inner liner (11) forming a receiving chamber (111), an outer shell (12), a heat-insulating cavity (13) formed between the inner liner (11) and the outer shell (12), and an evaporation cover (14) that divides the receiving chamber (111) into an evaporation cavity (1111) and a storage cavity (1112); The door is connected to the top of the cabinet (1); The centrifugal fan (2) as described in any one of claims 1-12, wherein the air inlet (212) is connected to the evaporation chamber (1111); The cabinet (1) includes at least one air duct cover (15), which together with the inner liner (11) forms a first air duct (1113) and a second air duct (1114). The first air duct (1113) connects the first air outlet (213) and the storage cavity (1112), and the second air duct (1114) connects the second air outlet (214) and the storage cavity (1112).

14. The freezer as described in claim 13, characterized in that, The air duct cover (15) includes a first air cover (151) and a second air cover (152). The first air cover (151) and the inner liner (11) together form a first air passage (1113), and the second air cover (152) and the inner liner (11) together form a second air passage (1114). The first air cover (151) and the second air cover (152) are arranged alternately along the axial direction of the impeller (22).

15. The freezer as described in claim 13, characterized in that, At least a portion of the first air passage (1113) and / or the second air passage (1114) protrudes into the insulation cavity (13).

16. The freezer as described in claim 13, characterized in that, At least a portion of the first air passage (1113) and / or the second air passage (1114) protrudes into the storage cavity (1112).

17. The freezer as described in claim 13, characterized in that, The freezer also includes at least one sealing element (3, 4), the volute (21) abuts against the evaporator cover plate (14) on one side along the axial direction of the impeller (22), the volute (21) abuts against the inner liner (11) on the opposite side along the axial direction of the impeller (22), and the sealing element (3, 4) is located between the volute (21) and the inner liner (11).

18. The freezer as described in claim 13, characterized in that, The inner liner (11) has a clearance step (112) protruding into the receiving compartment (111), the storage cavity (1112) includes a first cavity (11121) located above the clearance step (112) and a second cavity (11122) communicating with the first cavity (11121), a first air passage (1113) communicating with the second cavity (11122), and a second air passage (1114) communicating with the second cavity (11122); or, The second air passage (1114) is connected to the first cavity (11121) and the second cavity (11122).

19. The freezer as described in claim 13, characterized in that, The cabinet (1) includes two air duct covers (15), which are symmetrically arranged on both sides of the evaporator cover (14).

20. The freezer as described in claim 13, characterized in that, At least a portion of the first air passage (1113) and / or the second air passage (1114) is formed by thermoforming or bending of the inner liner (11).

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