Fan system and refrigerator

Abstract

The utility model provides a fan system and a refrigerator. The fan system comprises a wind scooper, fan blades and a fan blade support, and further comprises a plurality of grooves which are formed in the inner wall of the wind scooper and located in the positions outside the connecting position of the wind scooper and the fan blade support; the annular structure extends in a manner of being parallel to the central axis of the wind scooper and separates the inner wall of the wind scooper from the fan blades, and the wall surface, close to the fan blades, of the annular structure is a flat wall surface. According to the fan system, on the premise that the radial size and the axial size of the wind scooper are not changed, noise generated by the top gap can be fully reduced in a reasonable mode. Besides, the flat wall face, close to the fan blades, of the annular structure is used for preventing new flow field turbulence from being generated between the inner wall of the annular structure and the fan blades, increase of the load of the fan blades is avoided, and damage to the fan blades and degradation of the noise reduction capacity caused by the flow field turbulence are prevented.

Description

Technical Field

[0001] The utility model relates to the field of fans, and particularly to a fan system and a refrigerator. Background Art

[0002] Refrigerating devices such as refrigerators and freezers are usually provided with a fan system, which generally includes components such as a wind guide cover, fan blades and a fan blade bracket. On this basis, in order to prevent the fan blades from scraping against the wind guide cover when the fan system is working, a certain distance of top clearance is provided between the inner wall of the wind guide cover and the tip of the fan blade. This top clearance will cause flow interference at the aerodynamic level of the fan blades, resulting in relatively large noise generated by the rotating fan blades. Specifically, when the fan system rotates and works, the circumferential uniformity of its flow field is one of the main reasons determining the noise generated by the fan system. If the top clearance is too small, it will cause relatively large flow interference to the fan blades, thereby generating relatively large noise.

[0003] Regarding the aforementioned noise problem, in the prior art, the noise generated by the top clearance can be reduced by further increasing the top clearance between the inner wall of the wind guide cover and the tip of the fan blade, so as to reduce the flow interference. In addition, in the prior art, a flow guiding structure can also be provided in front of the fan system to improve the inflow angle of the flow field of the fan system, thereby reducing the noise generated by the top clearance. However, due to the limited bottom space of traditional refrigerating devices, especially built-in refrigerators, and the installation dimensions of the wind guide cover are often restricted in various ways. For example, the circumferential installation dimension of the wind guide cover is restricted, which will lead to a small adjustable range of the top clearance, and further lead to an insignificant noise reduction effect after adjusting the top clearance; or, the axial installation dimension of the wind guide cover is restricted, which will lead to a small installable area of the flow guiding structure, and its axial distance from the fan blade is too small, thus easily causing flow loss at the bottom of the refrigerating device and affecting the efficiency of the fan system.

[0004] It can be seen that although increasing the top clearance or providing a flow guiding structure in front of the fan system can play a role in noise reduction, both methods have certain technical limitations, which in turn lead to difficulties in implementation or insignificant noise reduction effects. More seriously, the aforementioned two methods may also be accompanied by a certain risk of flow loss. Therefore, there is a market demand for a fan system and a refrigerator that can reasonably reduce the noise generated by the top clearance in a reasonable way without changing the radial dimension and axial dimension of the wind guide cover. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a fan system and a refrigerator that can reasonably reduce the noise generated by the top clearance in a reasonable way without changing the radial dimension and axial dimension of the wind guide cover.

[0006] The present utility model solves the above technical problems through the following technical solutions:

[0007] A fan system, the fan system includes a wind guide cover, fan blades and a fan blade bracket, and the fan system further includes:

[0008] A plurality of grooves, the plurality of grooves are arranged on the inner wall of the wind guide cover and are located at positions outside the connection between the wind guide cover and the fan blade bracket; and

[0009] A ring structure, the ring structure extends parallel to the central axis of the wind guide cover and separates the inner wall of the wind guide cover from the fan blades, wherein the wall surface of the ring structure close to the fan blades is a flat wall surface.

[0010] In this solution, the grooves formed on the inner wall of the wind guide cover are a new way to increase the top clearance. The plurality of grooves are arranged on the inner wall of the wind guide cover and are located at positions outside the connection between the wind guide cover and the fan blade bracket. Thus, on the premise of not changing the radial dimension and axial dimension of the wind guide cover, the top clearance can be fully increased to reduce flow interference, fully improving the circumferential uniformity of the flow field of the fan system, and further fully reducing the noise generated by the top clearance. In other words, the setting method in this solution enables the fan system to increase the top clearance without increasing the circumferential dimension or axial dimension of the wind guide cover. At the same time, there is no need to install an additional flow guiding structure to improve the inflow angle of the flow field of the fan system, avoiding the additional space occupied by the fan system for noise reduction. Furthermore, the grooves can also increase the flow-through area of the fan system to a certain extent, increase the flow rate through the fan system, and improve the efficiency of the fan system.

[0011] In addition, the grooves formed on the inner wall of the wind guide cover will cause strong flow separation near the tip edge and form separation vortices, that is, form a flow reversal of the air flow. The pressure near the tip will drop sharply, causing the air flow on the pressure surface of the fan blade to flip to the suction surface and interfere with the flow field of the rotating fan blade, resulting in a disordered flow field in the top clearance and imposing a large load on the fan blade, ultimately leading to damage to the fan blade and deterioration of the noise reduction ability. To avoid the above situation, the fan system further adopts a ring structure, the ring structure extends parallel to the central axis of the wind guide cover and separates the inner wall of the wind guide cover from the fan blades, and then effectively slows down the flow separation and prevents the generation of separation vortices by means of blocking. At the same time, the flat wall surface of the ring structure close to the fan blades is used to prevent the generation of new flow field disorders between the inner wall of the ring structure and the fan blades, avoiding an increase in the load on the fan blade and preventing damage to the fan blade and deterioration of the noise reduction ability caused by flow field disorders.

[0012] Preferably, the maximum depth of the groove is in a ratio of 1 / 3 to 1 / 2 to the thinnest thickness on the wind guide cover; and / or the spacing distance between the inner wall of the annular structure and the blade tip of the fan blade is less than or equal to the spacing distance between the outer wall of the annular structure and the inner wall of the wind guide cover.

[0013] In this solution, by limiting the maximum depth of the groove to a ratio of 1 / 3 to 1 / 2 relative to the thinnest thickness on the wind guide cover, it is ensured that after the groove is opened on the inner wall of the wind guide cover, the entirety still has sufficient thickness, thereby ensuring that it has sufficient structural strength. In addition, the blade tip is the outermost end of the fan blade, and by limiting the spacing between the inner wall of the annular structure and the blade tip of the fan blade to be less than or equal to the spacing between the outer wall of the annular structure and the inner wall of the wind guide cover, in addition to ensuring that the combination of the fan blade, the annular structure and the wind guide cover has sufficient structural strength, it can also fully ensure that the distance between the annular structure and the fan blade is close enough, fully realizing the mitigation of flow separation and preventing the generation of separation vortices.

[0014] Preferably, the interval between the inner wall of the annular structure and the blade tip of the fan blade is 0.5 to 1.5 mm; and / or the thickness between the inner wall of the annular structure and the outer wall of the annular structure is 1 to 2 mm.

[0015] In this solution, the inner wall of the annular structure is spaced 0.5 to 1.5 mm from the blade tip of the fan blade, thereby determining the preferred distance between the inner wall of the annular structure and the blade tip of the fan blade, more fully achieving the mitigation of flow separation and preventing the generation of separation vortices. By limiting the thickness between the inner wall of the annular structure and the outer wall of the annular structure to 1 to 2 mm, the preferred thickness of the annular structure is determined, reducing the ventilation area occupied by the annular structure on the fan system, and avoiding the reduction of the flow of the fan system by the annular structure as much as possible.

[0016] Preferably, the annular structure is provided with a plurality of flow holes penetrating between the inner wall of the annular structure and the outer wall of the annular structure.

[0017] In this solution, a plurality of flow holes penetrating between the inner wall and the outer wall of the annular structure are provided on the annular structure to connect the inner side of the annular structure with the outer side of the annular structure, thereby further avoiding the annular structure from reducing the flow of the fan system.

[0018] Preferably, the flow holes are square in shape, and are evenly distributed on the main body of the annular structure based on the central axis of the annular structure.

[0019] In this solution, by setting the flow holes as square and arranging them evenly on the main body of the annular structure with respect to the central axis of the annular structure, the flow holes in this setting can directly make pre-positioning for subsequent manufacturing processes on the main body of the annular structure. While ensuring that the airflow flowing through the flow holes is evenly distributed over the entire circumference of the annular structure, it provides a setting method that is convenient for manufacturing during the production process and easy to implement.

[0020] Preferably, the angle between two adjacent flow holes with respect to the central axis of the annular structure is at least 20 degrees; and / or, the angle between two adjacent grooves with respect to the central axis of the air guide cover is at least 30 degrees.

[0021] In this solution, by defining the specific angles between adjacent flow holes with respect to the central axis of the annular structure and the specific angles between adjacent grooves with respect to the central axis of the air guide cover, while further ensuring that the airflow flowing through the flow holes is evenly distributed over the entire circumference of the annular structure, it is a setting method that is convenient for manufacturing during the production process and easy to implement.

[0022] Preferably, one end of the annular structure facing the blade bracket is engaged with the blade bracket.

[0023] In this solution, one end of the annular structure facing the blade bracket is engaged with the blade bracket, thus providing a convenient connection method between the annular structure and the blade bracket.

[0024] Preferably, the groove extends through both ends of the air guide cover along the extension direction of the air guide cover.

[0025] In this solution, the groove extends through both ends of the air guide cover along the extension direction of the air guide cover, so that the groove communicates from the air inlet position of the air guide cover to the air outlet position of the air guide cover. The groove in this setting can be conveniently formed directly by cutting from the air inlet position of the air guide cover through to the air outlet position of the air guide cover.

[0026] Preferably, the cross-section of the groove with respect to the central axis of the air guide cover is fan-shaped, and the grooves are evenly distributed on the inner wall of the air guide cover.

[0027] In this solution, the cross-section of the groove with respect to the central axis of the air guide cover is fan-shaped and can be directly cut and made using a cutting tool. In addition, the grooves are evenly distributed on the inner wall of the air guide cover. The grooves evenly distributed on the inner wall of the main body of the air guide cover can directly make pre-positioning for subsequent manufacturing processes on the main body of the air guide cover, thus it is a setting method that is convenient for manufacturing during the production process and easy to implement.

[0028] A refrigerator, the refrigerator includes the blower system of any one of the foregoing.

[0029] In this solution, by setting up the above-mentioned fan system, the refrigerator can fully reduce the noise generated by the top gap in a reasonable manner without changing the original dimensions of the refrigerator and the fan system.

[0030] Based on the common knowledge in this field, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present utility model.

[0031] The positive and progressive effects of the present utility model are as follows: The fan system and the refrigerator in the present utility model can fully reduce the noise generated by the top gap in a reasonable manner without changing the radial dimension and the axial dimension of the air guide cover, showing significant progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a three-dimensional structural schematic diagram of the fan system according to an embodiment of the present utility model;

[0033] Figure 2 is a three-dimensional structural schematic diagram of the annular structure of the fan system according to an embodiment of the present utility model;

[0034] Figure 3 is another three-dimensional structural schematic diagram of the fan system according to an embodiment of the present utility model, wherein the annular structure of the fan system is removed in the Figure 3 shown state.

[0035] DESCRIPTION OF THE REFERENCE NUMERALS

[0036] Fan system 100

[0037] Air guide cover 10

[0038] Groove 11

[0039] Installation groove 12

[0040] Fan blade 20

[0041] Tip 21

[0042] Fan blade bracket 30

[0043] Support part 31

[0044] Annular structure 40

[0045] Circulation hole 41 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The present utility model will be further described below by way of embodiments, but the present utility model is not limited to the scope of the embodiments accordingly.

[0047] As Figures 1-3As shown, a fan system 100 includes a wind guide cover 10, seven fan blades 20, and a fan blade bracket 30 for mounting the fan blades 20 into the wind guide cover 10. The fan system 100 further includes:

[0048] Grooves 11, twelve grooves 11 are provided on the inner wall of the wind guide cover 10 and are located at positions outside the connection between the wind guide cover 10 and the fan blade bracket 30; and

[0049] A ring structure 40, the ring structure 40 extends parallel to the central axis of the wind guide cover 10 and separates the inner wall of the wind guide cover 10 from the fan blades 20, wherein the wall surface of the ring structure 40 close to the fan blades 20 is a flat wall surface.

[0050] In specific implementation, the grooves 11 formed on the inner wall of the wind guide cover 10 are a new way to increase the top clearance. Multiple grooves 11 are provided on the inner wall of the wind guide cover 10 and are located at positions outside the connection between the wind guide cover 10 and the fan blade bracket 30. Thus, without changing the radial dimension and axial dimension of the wind guide cover 10 on the previous basis, the top clearance can be sufficiently increased to reduce flow interference, fully improving the circumferential uniformity of the flow field of the fan system 100, and further fully reducing the noise generated by the top clearance. In other words, the setting method in this solution enables the fan system to increase the top clearance without increasing the circumferential dimension or axial dimension of the wind guide cover 10. At the same time, there is no need to install an additional flow guiding structure to improve the inflow angle of the flow field of the fan system 100, avoiding the additional space occupied by the fan system 100 caused by reducing noise. Furthermore, the grooves 11 can also increase the flow-through area of the fan system 100 to a certain extent, increase the flow rate through the fan system 100, and improve the efficiency of the fan system 100.

[0051] In addition, the groove 11 formed on the inner wall of the air guide cover 10 will cause a strong flow separation phenomenon near the edge of the blade tip 21 and form a separation vortex, that is, a flow reversal of the air flow is formed. The pressure near the blade tip 21 will drop sharply, causing the air flow on the pressure surface of the fan blade 20 to reverse to the suction surface and interfere with the flow field of the fan blade 20 during rotation, resulting in a disordered flow field in the tip clearance and imposing a large load on the fan blade 20, ultimately leading to damage to the fan blade 20 and deterioration of the noise reduction ability. To avoid the foregoing situation, the fan system 100 further adopts an annular structure 40. The annular structure 40 extends parallel to the central axis of the air guide cover 10 and separates the inner wall of the air guide cover 10 from the fan blade 20. Furthermore, by means of partitioning, the flow separation is effectively slowed down and the generation of the separation vortex is prevented. At the same time, the flat wall surface of the annular structure 40 close to the fan blade 20 is used to prevent the generation of a new disordered flow field between the inner wall of the annular structure 40 and the fan blade 20, avoiding an increase in the load on the fan blade 20 and preventing the damage to the fan blade 20 and the deterioration of the noise reduction ability caused by the disordered flow field.

[0052] In this embodiment, the annular structure 40 is a circular ring and the inner wall of the air guide cover 10 is in a circular tubular shape, thus achieving the best fit between the two. Without affecting the rotation of the fan blade 20, those skilled in the art can also adjust the shapes of the annular structure 40 and the inner wall of the air guide cover 10 according to actual requirements.

[0053] Furthermore, the air guide cover 10 is provided with four mounting grooves 12 at a predetermined position. The two adjacent mounting grooves 12 are at an angle of 90 degrees with respect to the central axis of the air guide cover 10. The fan blade bracket 30 is structurally provided with a corresponding number of support portions 31 as the number of the mounting grooves 12, specifically four support portions 31. The four support portions 31 are connected to the four mounting grooves 12 on the air guide cover 10 in a plug-in manner.

[0054] As an alternative implementation, those skilled in the art can also adopt other connection methods other than plug-in connection, such as connecting the fan blade bracket 30 to the air guide cover 10 by means of threaded connection or magnetic attraction connection, which are common connection methods in the art. In addition, compared with the method of plugging the fan blade bracket 30 into the air guide cover 10 through four support portions 31 in this embodiment, those skilled in the art should also be able to think of using other numbers of support portions 31 to plug the fan blade bracket 30 into the air guide cover 10, such as using three support portions 31 or only one support portion 31 to plug the fan blade bracket 30 into the air guide cover 10. This embodiment also does not limit this.

[0055] Such as Figures 1-3As shown, the maximum depth of the groove 11 has a ratio of 1 / 2 to the thinnest thickness on the air guide cover 10; and, the distance between the inner wall of the annular structure 40 and the tip 21 of the fan blade 20 is 7 mm, and the aforementioned distance is less than the distance between the outer wall of the annular structure 40 and the inner wall of the air guide cover 10.

[0056] In specific implementation, by defining that the maximum depth of the groove 11 has a ratio of 1 / 2 to the thinnest thickness on the air guide cover 10, it is ensured that the air guide cover 10 still has sufficient thickness after the groove 11 is opened on its inner wall, thereby ensuring that it has sufficient structural strength. In addition, the tip 21 is the outermost end of the fan blade 20. By defining that the distance between the inner wall of the annular structure 40 and the tip 21 of the fan blade 20 is 7 mm, and the aforementioned distance is less than the distance between the outer wall of the annular structure 40 and the inner wall of the air guide cover 10, in addition to ensuring that the combination of the fan blade 20, the annular structure 40, and the air guide cover 10 has sufficient structural strength, it can also fully ensure that the distance between the annular structure 40 and the fan blade 20 is close enough to fully achieve the mitigation of flow separation and prevent the generation of separation vortices.

[0057] As an alternative implementation, the ratio of the maximum depth of the groove 11 to the thinnest thickness on the air guide cover 10 can also be set to 1 / 3. Without causing the structural strength of the air guide cover 10 to be too low, this embodiment does not make a limitation on this. Further, the distance between the inner wall of the annular structure 40 and the tip 21 of the fan blade 20 can also be increased to be equal to the distance between the outer wall of the annular structure 40 and the inner wall of the air guide cover 10. Without seriously affecting the mitigation of flow separation by the annular structure 40 and not affecting the generation of separation vortices by the annular structure 40, this embodiment also does not make a limitation on this.

[0058] As Figures 1-3 shown, there is a 1-mm gap between the inner wall of the annular structure 40 and the tip 21 of the fan blade 20; and, the thickness from the inner wall of the annular structure 40 to the outer wall of the annular structure 40 is 1.5 mm.

[0059] In the specific implementation, the inner wall of the annular structure 40 and the blade tip 21 of the blade 20 are spaced 1 mm apart, thereby determining the preferred distance between the inner wall of the annular structure 40 and the blade tip 21 of the blade 20, more fully achieving the mitigation of flow separation and preventing the generation of separation vortices. By limiting the thickness between the inner wall of the annular structure 40 and the outer wall of the annular structure 40 to 1.5 mm, the preferred thickness of the annular structure 40 is determined, reducing the ventilation area occupied by the annular structure 40 of the fan system 100, and avoiding the reduction of the flow of the fan system 100 by the annular structure 40 as much as possible. In this embodiment, the specific spacing distance between the inner wall of the annular structure 40 and the blade tip 21 of the blade 20 and the thickness of the annular structure 40 are specially formulated for a fan with a rotation radius of 71 mm and an inner wall of the wind guide hood 10 with a radial distance of 78 mm relative to the rotation center. When the rotation radius of the fan or the radial distance of the inner wall of the air guide hood 10 relative to the rotation center changes, those skilled in the art should be able to understand that the specific spacing distance between the inner wall of the annular structure 40 and the blade tip 21 of the fan blade 20 and the thickness of the annular structure 40 need to be appropriately adjusted. Figures 1-3 As shown, the annular structure 40 is provided with a plurality of flow holes 41 penetrating between the inner wall of the annular structure 40 and the outer wall of the annular structure 40 .

[0060] In a specific implementation, a plurality of flow holes 41 penetrating between the inner wall of the annular structure 40 and the outer wall of the annular structure 40 are provided on the annular structure 40, so that the inner side of the annular structure 40 is connected with the outer side of the annular structure 40, thereby further avoiding the annular structure 40 from reducing the flow rate of the fan system 100.

[0061] like Figures 1-3 As shown, the flow holes 41 are square in shape, and the flow holes 41 are evenly distributed on the main body of the annular structure 40 based on the central axis of the annular structure 40 .

[0062] In specific implementation, by setting the flow holes 41 to be square, and setting the flow holes 41 to be evenly distributed on the main body of the annular structure 40 based on the central axis of the annular structure 40, the flow holes 41 in this setting can be directly pre-positioned on the main body of the annular structure 40 for subsequent manufacturing processes, while ensuring that the airflow flowing through the flow holes 41 is evenly distributed around the entire circumference of the annular structure 40, providing a setting method that is easy to manufacture and easy to implement during the production process. As an alternative embodiment, those skilled in the art can also think of using other shapes commonly used in the art as the shape of the flow holes 41, such as using circular or elliptical flow holes 41, and this embodiment does not limit this.

[0063] like Figures 1-3As shown, the angle between two adjacent flow holes 41 with respect to the central axis of the annular structure 40 is 20 degrees; and / or, the angle between two adjacent grooves 11 with respect to the central axis of the air guide cover 10 is 30 degrees.

[0064] In a specific implementation, by defining the specific angles between adjacent flow holes 41 with respect to the central axis of the annular structure 40 and between adjacent grooves 11 with respect to the central axis of the air guide cover 10, while further ensuring that the air flow passing through the flow holes 41 is evenly distributed over the entire circumference of the annular structure 40, it is a setting method that is convenient for manufacturing during the production process and easy to implement. In this embodiment, two adjacent grooves 11 among the twelve grooves 11 are arranged at an angle of 20 degrees with respect to the central axis of the annular structure 40. This angle corresponds to the specific case where the number of grooves 11 is set to twelve, thereby ensuring that the grooves 11 are evenly distributed over the entire 360 degrees. In this regard, those skilled in the art should be able to think that when using other numbers of grooves 11, the angle between two adjacent grooves 11 with respect to the central axis of the annular structure 40 should also be adjusted accordingly. For example, when using ten grooves 11, the angle between two adjacent grooves 11 with respect to the central axis of the annular structure 40 should be adjusted to 36 degrees. The aforementioned adjustment also applies to the case of using other numbers of flow holes 41. As Figures 1-3 As shown, one end of the annular structure 40 facing the fan blade support 30 is joined to the fan blade support 30.

[0065] In a specific implementation, one end of the annular structure 40 facing the fan blade support 30 is joined to the fan blade support 30, thereby providing a convenient connection method between the annular structure 40 and the fan blade support 30.

[0066] As Figures 1-3 As shown, the groove 11 penetrates through both ends of the air guide cover 10 along the extension direction of the air guide cover 10.

[0067] In a specific implementation, the groove 11 penetrates through both ends of the air guide cover 10 along the extension direction of the air guide cover 10, so that the groove 11 communicates from the air inlet position of the air guide cover 10 to the air outlet position of the air guide cover 10. In this setting, the groove 11 can be conveniently formed by directly cutting through from the air inlet position of the air guide cover to the air outlet position of the air guide cover 10 through cutting manufacturing.

[0068] As Figures 1-3 As shown, the cross-section of the groove 11 with respect to the central axis of the air guide cover 10 is fan-shaped, and the grooves 11 are evenly distributed on the inner wall of the air guide cover 10. The outer arc circumference of the fan-shaped groove 11 is 16.88 millimeters and the inner arc circumference is 15.58 millimeters.

[0069] In specific implementation, the cross-section of the groove 11 with respect to the central axis of the air guide cover 10 is fan-shaped and can be directly machined using a cutting tool. In addition, the grooves 11 are evenly distributed on the inner wall of the air guide cover 10. The grooves 11 evenly distributed on the inner wall of the main body of the air guide cover 10 can directly make pre-positioning for subsequent manufacturing processes on the main body of the air guide cover 10, so it is a setting method that is convenient for manufacturing during the production process and easy to implement. The same as the situation discussed in the previous text, the outer arc circumference and the inner arc circumference of the fan-shaped groove 11 in this embodiment are specifically formulated for a fan with a rotation radius of 71 mm and the inner wall of the air guide cover 10 with a radial distance of 78 mm relative to the rotation center. When the rotation radius of the fan or the radial distance of the inner wall of the air guide cover 10 relative to the rotation center changes, those skilled in the art should be able to think that it is necessary to make appropriate adjustments to the outer arc circumference and the inner arc circumference of the fan-shaped groove 11.

[0070] This embodiment also provides a refrigerator (not shown in the figure), and the refrigerator includes a fan system 100.

[0071] In specific implementation, by providing the above-mentioned fan system 100, the refrigerator can reasonably reduce the noise generated by the top clearance without changing the original dimensions of the refrigerator and the fan system 100.

[0072] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fan system, comprising an air guide cover, a fan blade and a fan blade bracket, characterized in that: The fan system also includes: A plurality of grooves, wherein the plurality of grooves are arranged on the inner wall of the air guide cover and are located at positions other than the connection between the air guide cover and the fan blade bracket; and An annular structure extends parallel to the central axis of the air guide cover and separates the inner wall of the air guide cover from the fan blades, wherein the wall surface of the annular structure close to the fan blades is a flat wall surface.

2. The fan system according to claim 1, characterized in that: The maximum depth of the groove is in a ratio of 1 / 3 to 1 / 2 to the thinnest thickness on the wind guide cover; and / or the spacing distance between the inner wall of the annular structure and the blade tip of the fan blade is less than or equal to the spacing distance between the outer wall of the annular structure and the inner wall of the wind guide cover.

3. The fan system according to claim 2, characterized in that: The inner wall of the annular structure and the blade tip of the fan blade are spaced 0.5 to 1.5 mm apart; and / or the thickness from the inner wall of the annular structure to the outer wall of the annular structure is 1 to 2 mm.

4. The fan system according to claim 1, characterized in that: The annular structure is provided with a plurality of flow holes penetrating between the inner wall of the annular structure and the outer wall of the annular structure.

5. The fan system according to claim 4, characterized in that: The flow holes are square in shape, and are evenly distributed on the main body of the annular structure based on the central axis of the annular structure.

6. The fan system according to claim 5, characterized in that: The angle between two adjacent flow holes is at least 20 degrees relative to the central axis of the annular structure; and / or the angle between two adjacent grooves is at least 30 degrees relative to the central axis of the air guide cover.

7. The fan system according to any one of claims 1 to 6, characterized in that: One end of the annular structure facing the blade support is engaged with the blade support.

8. The fan system according to claim 1, characterized in that: The groove passes through two ends of the air guide cover along the extension direction of the air guide cover.

9. The fan system according to claim 1, characterized in that: The cross section of the groove relative to the central axis of the air guide cover is fan-shaped, and the grooves are evenly distributed on the inner wall of the air guide cover.

10. A refrigerator, characterized in that: The refrigerator comprises a fan system according to any one of claims 1-9.

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