Air guide ring and fan assembly

Abstract

The present application discloses a wind guide ring and a fan assembly. The wind guide ring is configured to be sleeved on the fan and guide the airflow. The inner wall of the wind guide ring encloses an accommodation space configured to wrap the fan. The fan assembly includes a fan and a wind guide ring, and the fan is disposed in the accommodation space. In the above arrangement, the wind guide ring can be wrapped around the circumference of the fan, so that the airflow flowing from the upstream of the heat exchange system to the fan can move in a direction parallel to the axis of the wind guide ring, that is, the airflow can move in a direction parallel to the axis of the fan until it reaches the fan blades, so that the fan blades can better drive the gas flow and make more gas flow out of the wind guide ring and flow to the downstream of the heat exchange system, thereby improving the air volume of the fan assembly; when the air volume is a constant value, the rotation speed of the fan can be appropriately reduced to reduce the noise.

Description

Technical Field

[0001] The present application relates to the field of heat exchange, and particularly to an air guide ring and a fan assembly. Background Art

[0002] A heat exchange system includes a heat exchanger, and a fan assembly needs to be provided on the heat exchanger. The fan assembly can accelerate the air flow around the heat exchanger to improve the heat exchange efficiency of the heat exchanger. The side of the fan assembly close to the heat exchanger is the upstream of the fan assembly, and the fan assembly can drive the air to flow from the upstream to the downstream. The fan assembly includes a fan and an air guide ring, and the air guide ring is sleeved on the periphery of the fan. However, the air volume output of the fan assembly in the prior art is small. To ensure sufficient air volume output, it is necessary to increase the rotational speed of the fan, that is, to increase the rotational speed of the motor that drives the fan to rotate, thereby generating greater noise. Summary of the Invention

[0003] The present application provides an air guide ring and a fan assembly, which can preferably achieve increasing the air volume output and reducing the noise.

[0004] According to a first aspect of the present application, an air guide ring is provided. The air guide ring is configured to be sleeved on a fan and guide the air flow. The air guide ring is annular, and the inner wall of the air guide ring encloses a receiving space configured to wrap the fan.

[0005] Further, along the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end;

[0006] In the direction from the second end to the first end, the inner wall of the air guide ring near the first end extends outward, and at least a part of the air guide ring that extends outward forms a first extension part.

[0007] Further, the included angle between the first extension part and the axis of the air guide ring is greater than or equal to 3° and less than or equal to 40°.

[0008] Further, the air guide ring further includes a flow concentrating part, and the flow concentrating part is farther from the first end than the first extension part;

[0009] The size of the inner wall of the flow concentrating part is less than or equal to the size of the inner wall of the first extension part, and in the direction from the second end to the first end, the sizes of all positions of the flow concentrating part are the same.

[0010] Further, along the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end;

[0011] In the direction from the first end to the second end, the inner wall of the air guide ring near the second end extends outward.

[0012] Furthermore, the air guiding ring includes a first turning position. In the direction from the first end to the second end, the inner wall of the air guiding ring on the side away from the first end of the first turning position extends outward.

[0013] The inner wall of the air guiding ring on the side away from the first end of the first turning position includes a second extension part and a third extension part connected axially. The third extension part is farther from the first end than the second extension part.

[0014] The slope of the second extension part is greater than the slope of the third extension part.

[0015] Furthermore, the blower is arranged in the accommodation space, and the axis of the blower coincides with the axis of the air guiding ring.

[0016] The blower includes blades. The distance between the first turning position and the center of the blades in the direction from the first end to the second end is a first value, and the ratio of the first value to the radius of the blower is less than or equal to 0.08.

[0017] Furthermore, the blower is arranged in the accommodation space.

[0018] The second extension part and at least a part of the air guiding ring above it are smoothly connected by a first arc. The ratio of the radius of the first arc to the radius of the blower is greater than or equal to 0.04 and less than or equal to 0.15; and / or, the second extension part and the third extension part are smoothly connected by a second arc. The ratio of the radius of the second arc to the radius of the blower is greater than or equal to 0.04 and less than or equal to 0.15.

[0019] Furthermore, reinforcing ribs are arranged on the outer wall of the air guiding ring and are distributed along the axial direction and / or the circumferential direction of the air guiding ring; and / or,

[0020] In the height direction, the air guiding ring includes a first end and a second end, and the air flow can flow from the second end to the first end; a clamping groove is formed by the second end of the air guiding ring being axially recessed inward; and / or,

[0021] In the height direction, the air guiding ring includes a first end and a second end, and the air flow can flow from the second end to the first end; the first end of the air guiding ring extends outward circumferentially to form a flange, and positioning holes are provided on the flange.

[0022] According to the second aspect of the present application, a blower assembly is provided. The blower assembly includes a blower and the above-mentioned air guiding ring, and the blower is arranged in the accommodation space.

[0023] In the height direction, the air guiding ring includes a first end and a second end, and the fan rotates to drive the air flow from the second end to the first end; in the axial direction, the fan includes a top end and a bottom end, and the bottom end is closer to the second end than the top end.

[0024] The second end of the air guiding ring is farther from the first end than the bottom end of the fan, and the first end of the air guiding ring is farther from the second end than the top end of the fan.

[0025] Furthermore, the minimum distance from the fan to the inner wall of the air guiding ring is a second value, and the ratio of the second value to the radius of the fan is greater than or equal to 0.01 and less than or equal to 0.04.

[0026] Furthermore, the number of the fans and the air guiding rings is multiple, and the number of the fans is the same as that of the air guiding rings. One fan is arranged in one air guiding ring; the multiple air guiding rings are arranged in a first direction.

[0027] The shape of the first end of the air guiding ring in the cross section is oval, and the short side of the oval is parallel to the first direction.

[0028] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0029] In the above setting, the air guiding ring can be wrapped around the periphery of the fan, so that the air flow flowing from the upstream of the heat exchange system to the fan can move in a direction parallel to the axis of the air guiding ring, that is, the air flow can move in a direction parallel to the axis of the fan until it reaches the blades of the fan, so that the blades can better drive the gas flow and make more gas flow out of the air guiding ring and flow to the downstream of the heat exchange system, thereby improving the air volume of the fan assembly; when the air volume is a constant value, the rotation speed of the fan can be appropriately reduced, thereby reducing the noise.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional structural schematic diagram of a fan assembly according to an embodiment of the present application.

[0032] Figure 2 is a planar structural schematic diagram of a fan assembly according to an embodiment of the present application.

[0033] Figure 3 is another planar structural schematic diagram of a fan assembly according to an embodiment of the present application.

[0034] Figure 4 is yet another planar structural schematic diagram of a fan assembly according to an embodiment of the present application.

[0035] Figure 5 It is another schematic plan view of the fan assembly according to an embodiment of the present application.

[0036] Figure 6 It is Figure 4 the schematic cross-sectional structure view in the A-A direction in

[0037] Figure 7 It is Figure 5 the schematic cross-sectional structure view in the B-B direction in

[0038] Figure 8 It is a schematic cross-sectional structure view of a fan assembly.

[0039] Figure 9 It is another schematic plan view of the fan assembly according to an embodiment of the present application.

[0040] Description of the reference numerals

[0041] Fan assembly 10

[0042] Upstream 20

[0043] Downstream 30

[0044] Air guide ring 100

[0045] First extension part 101

[0046] Second extension part 102

[0047] Third extension part 103

[0048] Converging part 104

[0049] First turning position 105

[0050] Second arc 107

[0051] Inner wall 110

[0052] Accommodating space 120

[0053] First end 130

[0054] Second end 140

[0055] Reinforcing rib 150

[0056] Card slot 160

[0057] Edge 170

[0058] Positioning hole 171

[0059] Fan 200

[0060] Wind blade 210

[0061] Shaft part 220

[0062] Top end 230

[0063] Bottom end 240

[0064] Motor 300

[0065] Rotating shaft 400

[0066] First value d1

[0067] Second value d2

[0068] Height direction H

[0069] First direction X

[0070] Second direction Y Specific implementation mode

[0071] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The exemplary embodiments described below do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0072] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0073] It should be understood that the terms "first", "second" and similar terms used in the description and claims of this application do not denote any order, quantity or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one. Unless otherwise indicated, terms such as "front part", "rear part", "lower part" and / or "upper part" are for convenience of description only and are not limited to a position or a spatial orientation. Terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0074] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0075] As Figure 1 shown, the present application discloses a fan assembly 10 applied to a heat exchange system.

[0076] As Figures 1 - 5 shown, when necessary, referring to Figure 6 and Figure 7 shown, the fan assembly 10 includes a wind guide ring 100, a fan 200 and a motor 300. Among them, the axis of the fan 200 coincides with the axis of the wind guide ring 100. The fan 200 includes fan blades 210 and a shaft portion 220. The number of the fan blades 210 is multiple, and they are distributed on the circumferential side of the shaft portion 220. The motor 300 drives the shaft portion 220 to rotate through a rotating shaft 400, thereby driving the fan blades 210 to rotate, and thus driving air to flow from the upstream 20 to the downstream 30.

[0077] It should be noted that the fan assembly 10 is configured to be installed on the circumferential side of a heat exchanger in the heat exchange system. The fan assembly 10 can accelerate the air flow around the heat exchanger to improve the heat exchange efficiency of the heat exchanger. The side of the fan assembly 10 close to the heat exchanger is used as the upstream 20, and the side far from the heat exchanger is used as the downstream 30. When the fan 200 in the fan assembly 10 rotates, it can drive air to flow from the upstream 20 to the downstream 30, that is, drive the air flow around the heat exchanger to improve the heat exchange efficiency of the heat exchanger.

[0078] As Figure 6 and Figure 7As shown, the air guide ring 100 is sleeved on the periphery of the fan 200 to guide the airflow. The air guide ring 100 is annular, and the inner wall 110 of the air guide ring 100 encloses an accommodation space 120 configured to wrap the fan 200. In other words, the fan 200 includes a top end 230 and a bottom end 240 along the axial direction. When the fan 200 is disposed in the accommodation space 120 of the air guide ring 100, both the top end 230 and the bottom end 240 of the fan 200 can be wrapped by the air guide ring 100.

[0079] As Figure 8 shown, in the existing design, the bottom of the fan 1 extends out of the air guide ring 2. Usually, during the design and manufacture of the fan 1, the blades 3 will be flipped by a certain angle relative to the horizontal direction so that the gas flowing along the axial direction of the fan 1 to the blades 3 can be better driven by the blades 3 to flow from the downstream to the upstream. In this design, the rotation of the fan 1 will create a negative pressure, which will attract the air around the fan 1. Then, since the bottom of the fan 1 near the upstream 20 extends out of the air guide ring 2, the gas on the periphery of the fan 1 on the side exposed from the air guide ring 2 will approach the blades 3 of the fan 1 in a direction perpendicular to the axis of the fan 1, as shown by the dashed arrow in the figure. The blades 3 cannot effectively drive this part of the gas to move along the axial direction of the fan 1 and move it downstream 30, resulting in a small air volume output of the fan assembly 4. At the same time, in order to meet the air volume required by the heat exchange system to ensure the heat exchange efficiency of the heat exchanger, it is necessary to increase the rotation speed of the fan 1, so it is necessary to increase the rotation speed of the motor 5, resulting in problems such as high noise and high energy consumption.

[0080] As Figure 6 and Figure 7As shown, in this design, the fan 200 is disposed in the accommodation space 120, that is, the air guide ring 100 can completely wrap around the periphery of the fan 200. That is, along the height direction H, the air guide ring 100 includes a first end 130 and a second end 140. The first end 130 faces downstream 30, and the second end 140 faces upstream 20. The air flow can flow from the second end 140 to the first end 130. When the fan 200 is disposed in the accommodation space 120 of the air guide ring 100, the bottom end 240 is closer to the second end 140 than the top end 230. The second end 140 of the air guide ring 100 is farther from the first end 130 than the bottom end 240 of the fan 200, and the first end 130 of the air guide ring 100 is farther from the second end 140 than the top end 230 of the fan 200. When the fan 200 rotates, the air pressure in the accommodation space 120 decreases. The air from downstream 30 enters the air guide ring 100 from the second end 140, and is driven by the blades 210 of the fan 200, flows out of the air guide ring 100 from the first end 130, and flows to downstream 30. Among them, the flow direction of the gas flowing into the air guide ring 100 from upstream 20 is shown by the dotted arrow in the figure. The gas entering the air guide ring 100 from the second end 140 is guided by the inner wall 110 of the air guide ring 100 and moves along the direction parallel to the axis of the air guide ring 100 towards the blades 210 of the fan 200. Since the axis of the air guide ring 100 coincides with the axis of the fan 200, the flow direction of the gas flowing from upstream 20 to the fan 200 is parallel to the axis of the fan 200. Through the above settings, the blades 210 can drive the gas to rotate better and make it move towards the direction closer to downstream 30. The flow rate of the gas in the fan assembly 10 is large, that is, the air output of the fan assembly 10 is increased, and it is beneficial to improve the heat exchange efficiency of the heat exchange system. At the same time, when the air output is a constant value, the rotation speed of the fan 200 can be appropriately reduced. In other words, the rotation speed of the motor 300 can be appropriately reduced, thereby reducing noise and energy consumption.

[0081] The following data can be obtained through experiments.

[0082] When the rotation speeds of the motor and the fan are the same, the air output data of the fan assemblies of the existing design and this design are shown in Table 1. When the air output of the fan assembly is the same, the noise data of the fan assemblies of the existing design and this design are shown in Table 2.

[0083]

[0084] Table 1

[0085] From the data recorded in Table 1, it can be seen that when the rotation speeds of the motor and the fan are the same, the air output of the fan assembly of this design is greatly improved compared with the existing design, and the improvement range of the air output is approximately about 5%.

[0086]

[0087] Table 2

[0088] As can be seen from the data recorded in Table 2, when the air output of the fan assembly is the same, the noise of the fan assembly of the present design is significantly reduced compared with the existing design, and the range of noise reduction is approximately from 1 decibel (dBA) to 1.2 decibels (dBA).

[0089] Furthermore, in the direction from the second end 140 to the first end 130, the inner wall 110 of the air guide ring 100 near the first end 130 expands outward, and at least a part of the air guide ring 100 that expands outward forms a first expansion part 101. During use, the gas flows from the second end 140 to the first end 130 driven by the fan 200. When the gas moves to a position near the first end 130, its flow rate is relatively fast and the dynamic pressure is relatively large. If the flow rate of the gas flowing out of the air guide ring 100 is too large, the gas will directly move away from the air guide ring 100 and directly enter the atmosphere, and it cannot effectively exchange heat with the device located downstream 30, and the heat exchange efficiency of the heat exchange system is relatively low.

[0090] By providing the first expansion part 101, the size of one side of the air guide ring 100 near the downstream 30 becomes larger, so that the flow rate of the flowing gas decreases after flowing to the first expansion part 101, that is, the dynamic pressure of this part of the gas is converted into static pressure, so that the gas flowing to the downstream 30 can better contact the device located downstream 30 to achieve heat exchange, so as to improve the heat exchange efficiency of the heat exchange system.

[0091] Through a large number of experiments, it can be known that as Figure 6 shown, when the included angle α between the first expansion part 101 and the axis of the air guide ring 100 is greater than or equal to 3° and less than or equal to 40°, the dynamic pressure of the gas can be preferably converted into static pressure, and at the same time, it can ensure that the gas has a sufficient flow rate to flow to the downstream 30 for heat exchange.

[0092] Further, the air guide ring 100 further includes a converging portion 104. The converging portion 104 is farther from the first end 130 than the first extension portion 101. The size of the inner wall 110 of the converging portion 104 is less than or equal to the size of the inner wall 110 of the first extension portion 101, and in the direction from the second end 140 to the first end 130, the sizes of all positions of the converging portion 104 are the same. During actual use, when the gap between the blades 210 of the fan 200 and the inner wall 110 of the air guide ring 100 is too large, the gas in the air guide ring 100 cannot be well driven by the blades 210 of the fan 200, which will affect the air output of the fan assembly 10. Therefore, the converging portion 104 with a size smaller than that of the first extension portion 101 is provided. The converging portion 104 can play a role in guiding and gathering the gas, so that the gas flowing into the air guide ring 100 from the upstream 20 can better reach the blades 210 and flow downstream 30 under the drive of the blades 210.

[0093] Proved by a large number of experiments, taking the minimum distance from the fan 200 to the inner wall 110 of the air guide ring 100 as the second value d2, when the ratio of the second value d2 to the radius R of the fan 200 is greater than or equal to 0.01 and less than or equal to 0.04, the gas in the air guide ring 100 can better reach the blades 210 and flow under the drive of the blades 210. In this embodiment, the distance from the inner wall 110 of the converging portion 104 to the air guide ring 100 is the smallest. In other words, the ratio of the distance from the inner wall 110 of the converging portion 104 to the fan 200 to the radius of the fan 200 is greater than or equal to 0.01 and less than or equal to 0.04 to improve the air output.

[0094] Further, in the direction from the first end 130 to the second end 140, the inner wall 110 of the air guide ring 100 near the second end 140 extends outward. Through the above setting, the size of the second end 140 of the air guide ring 100 facing the downstream 30 can be increased, so that more gas can enter the air guide ring 100 and can move under the drive of the fan 200. At the same time, during the experiment, the inventor(s) found that when the gas flows in a narrow space, it will cause greater noise. In other words, when the gap between the inner wall 110 of the air guide ring 100 and the blades 210 of the fan 200 is too small, the gas flowing in the narrow space will cause greater noise. In order to balance the problems of air output and noise, by expanding the size of the inner wall 110 of a part of the air guide ring 100, the distance between this part of the air guide ring 100 and the fan 200 can be increased. When the distance between the air guide ring 100 and the fan 200 increases, the noise can be effectively reduced.

[0095] Further, the air guide ring 100 includes a first turning position 105, and the first turning position 105 is located on the side of the converging portion 104 close to the second end 140. In the direction from the first end 130 to the second end 140, the inner wall 110 of the air guide ring 100 on the side of the first turning position 105 away from the first end 130 extends outward. The air guide ring 100 on the side of the first turning position 105 away from the first end 130 includes a second extension portion 102 and a third extension portion 103 connected axially. The third extension portion 103 is farther from the first end 130 than the second extension portion 102. The slope of the second extension portion 102 is greater than the slope of the third extension portion 103. Through the above settings, the size of the inner wall 110 of the second extension portion 102 increases rapidly, that is, the distance between the inner wall 110 and the wind blade 210 increases rapidly, reducing noise. At the same time, in order to prevent the fan assembly 10 from occupying too much space, the slope of the third extension portion 103 is reduced.

[0096] In this embodiment, the two ends of the converging portion 104 are respectively connected to the first extension portion 101 and the second extension portion 102. Alternatively, in other embodiments, the air guide ring 100 may further include a connecting portion, the two ends of the connecting portion are respectively connected to the first extension portion 101 and the second extension portion 102, and the converging portion 104 serves as at least part of the connecting portion.

[0097] As shown in the figure, at least part of the air guide ring 100 above the second extension portion 102 is smoothly connected through a first arc 106, that is, the two ends of the first arc 106 are connected to the second extension portion 102 and the converging portion 104 to achieve a smooth connection between the second extension portion 102 and the converging portion 104. The ratio of the radius r1 of the first arc 106 to the radius R of the fan 200 is greater than or equal to 0.04 and less than or equal to 0.15. The second extension portion 102 and the third extension portion 103 are smoothly connected through a second arc 107, and the ratio of the radius r2 of the second arc 107 to the radius R of the fan 200 is greater than or equal to 0.04 and less than or equal to 0.15. Experiments show that when the ratio of the radii of the first arc r1 and the second arc r2 to the radius R of the fan 200 falls within the above range, the second extension portion 102 can be rapidly expanded, the strength of the air guide ring 100 can be ensured, the phenomenon of stress concentration on the air guide ring 100 can be avoided, and at the same time, the area occupied by the fan assembly 10 can be maintained within a reasonable range.

[0098] Further, in this embodiment, the first turning position 105 is one end of the air-concentrating part 104 connected to the second extending part 102. The distance between the first turning position 105 and the center of the fan 200 in the direction from the first end 130 to the second end 140 is also the first value d1. In other words, the first value d1 is the distance between the first turning position 105 and the center of the blade 210 in the height direction H. The ratio of the first value d1 to the radius R of the fan 200 is less than or equal to 0.08. Through the above settings, the second extending part 102 will not affect the guiding effect of the air-concentrating part 104 on the air flow, enabling more gas to be driven by the blade 210 and flowing downstream to 30, thereby ensuring the air output of the fan assembly 10. At the same time, the noise generated when the fan 200 rotates can be minimized to the greatest extent.

[0099] It should be noted that the center position of the blade 210 referred to here is the position of the midpoint 212 of the connection line 211 from the top end to the bottom end of the blade 210.

[0100] As Figure 1 、 Figure 4 and Figure 5 shown, in this embodiment, the outer wall of the air guide ring 100 is provided with reinforcing ribs 150, and the reinforcing ribs 150 are distributed along the axial and circumferential directions of the air guide ring 100 to enhance the strength of the air guide ring 100. Of course, in other embodiments, the reinforcing ribs 150 may also be distributed only along the axial or circumferential direction of the air guide ring 100.

[0101] Further, as Figure 1 shown, the second end 140 of the air guide ring 100 is recessed inward along the axial direction to form a clamping groove 160. The fan assembly 10 can be clamped above other devices through the clamping groove 160, thereby realizing the mating connection with other device equipment in the heat exchange system.

[0102] Further, the first end 130 of the air guide ring 100 extends outward along the circumferential direction to form a flange 170, and positioning holes 171 are provided on the flange 170. Fasteners such as bolts and screws can pass through the positioning holes 171. The fan assembly 10 can be fixedly connected to other devices through the positioning holes 171, fasteners, etc., thereby realizing the fixation with other device equipment in the heat exchange system.

[0103] Further, as Figure 9 shown, in this embodiment, the numbers of the fans 200 and the air guide rings 100 are both multiple, and moreover, the numbers of the fans 200 and the air guide rings 100 are the same, and one fan 200 is arranged in one air guide ring 100. The multiple air guide rings 100 are arranged along the first direction X.

[0104] The shape of the first end 130 of the air guide ring 100 in the cross-section is oval. The short side 500 of the oval is parallel to the first direction X, the long side 600 of the oval is parallel to the second direction Y, and the first direction X is perpendicular to the second direction Y. In other words, the shape of the first extension 101 in the cross-section is oval. When multiple air guide rings 100 are arranged along the first direction X, the smaller ends of adjacent air guide rings 100 abut against each other, thereby reducing the area occupied by the fan assembly 10.

[0105] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes by using the disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the technical content of the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An air guide ring, which is configured to be sleeved on a fan and guide the flow of air. Characterized in that, The inner wall of the air guide ring encloses a receiving space configured to wrap the fan; In the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end; In the direction from the second end to the first end, the inner wall of the air guide ring near the first end extends outward, and at least a part of the outwardly extending air guide ring forms a first extension part; The air guide ring includes a first turning position. In the direction from the first end to the second end, the inner wall of the air guide ring on the side away from the first end at the first turning position extends outward; The inner wall of the air guide ring on the side away from the first end at the first turning position includes a second extension part and a third extension part connected axially, and the third extension part is farther from the first end than the second extension part; The slope of the second extension part is greater than the slope of the third extension part; The fan is arranged in the receiving space, and the axis of the fan coincides with the axis of the air guide ring; The fan includes fan blades. The distance between the first turning position and the center of the fan blades in the direction from the first end to the second end is a first value, and the ratio of the first value to the radius of the fan is less than or equal to 0.08; The central position of the fan is in the direction of the first turning position close to the second extension part.

2. The air guide ring according to claim 1, Characterized in that, The angle between the first extension part and the axis of the air guide ring is greater than or equal to 3° and less than or equal to 40°.

3. The air guide ring according to claim 1, Characterized in that, The air guide ring further includes a flow concentrating part, and the flow concentrating part is farther from the first end than the first extension part; The size of the inner wall of the flow concentrating part is less than or equal to the size of the inner wall of the first extension part, and in the direction from the second end to the first end, the sizes of all positions of the flow concentrating part are the same.

4. The air guide ring according to claim 1, Characterized in that, In the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end; In the direction from the first end to the second end, the inner wall of the air guide ring near the second end extends outward.

5. The air guide ring according to claim 1, Characterized in that, The fan is arranged in the receiving space; The second extension part and at least a part of the air guide ring above it are smoothly connected by a first arc, and the ratio of the radius of the first arc to the radius of the fan is greater than or equal to 0.04 and less than or equal to 0.15; and / or, the second extension part and the third extension part are smoothly connected by a second arc, and the ratio of the radius of the second arc to the radius of the fan is greater than or equal to 0.04 and less than or equal to 0.

15.

6. The air guide ring according to claim 1, Characterized in that, Reinforcing ribs are arranged on the outer wall of the air guide ring, and the reinforcing ribs are distributed along the axial direction and / or the circumferential direction of the air guide ring; and / or, In the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end; a clamping groove is formed by the second end of the air guide ring being recessed inwards along the axis; and / or, In the height direction, the air guide ring includes a first end and a second end, and the air flow can flow from the second end to the first end; an edge is formed by the first end of the air guide ring extending outwards in the circumferential direction, and positioning holes are provided on the edge.

7. A fan assembly Characterized in that The fan assembly includes a fan and an air guide ring as described in any one of claims 1-6, and the fan is arranged in the accommodation space; In the height direction, the air guide ring includes a first end and a second end, and the fan rotates to drive the air flow to flow from the second end to the first end; the fan includes a top end and a bottom end along the axis, and the bottom end is closer to the second end than the top end; The second end of the air guide ring is farther from the first end than the bottom end of the fan, and the first end of the air guide ring is farther from the second end than the top end of the fan.

8. The fan assembly according to claim 7 Characterized in that The minimum distance from the fan to the inner wall of the air guide ring is a second value, and the ratio of the second value to the radius of the fan is greater than or equal to 0.01 and less than or equal to 0.

04.

9. The fan assembly according to claim 7 Characterized in that The number of the fans and the air guide rings is multiple, and the number of the fans and the air guide rings is the same. One fan is arranged in one air guide ring; the multiple air guide rings are arranged in a first direction; The shape of the first end of the air guide ring in the cross-section is oval, and the short side of the oval is parallel to the first direction.

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