Oblique flow fan

Abstract

The utility model provides an oblique flow fan which comprises a frame body, the frame body comprises an air inlet, an air outlet, a containing space and a guide wall, the air inlet and the air outlet are formed in the two opposite sides of the frame body respectively and communicate with each other through the containing space, and the guide wall bends and extends into the containing space from the periphery of the air inlet in the axial direction; an inner wall of the guide wall is connected with an upper frame side wall of the frame body, and a backflow space is defined by the inner wall and the upper frame side wall; the impeller is contained in the containing space of the frame body and is provided with a flow guide ring, and airflow from the air inlet to the air outlet is formed when the impeller rotates; the plurality of non-return pressurizing structures are arranged in the backflow space of the frame body, are connected to the inner wall of the guide wall and the side wall of the upper frame, and divide the backflow space into a plurality of cavities; when the impeller rotates, a part of the airflow forms a dissipation airflow between the flow guide ring and the side wall of the upper frame, the dissipation airflow flows into the cavities, and a self-circulation flow field is formed in each cavity.

Description

Technical Field

[0001] This application relates to a diagonal flow fan, and more particularly to a diagonal flow fan having multiple chambers, which divides a single return space into multiple chambers through multiple anti-reverse pressurization structures, and forms a self-circulating flow field in each chamber to slow down the flow velocity of the escaping airflow, thereby achieving the purpose of reducing turbulence, improving fan characteristics, and reducing noise. Background Technology

[0002] As the computational and transmission demands of communication systems increase, the performance and power consumption of electronic components within these systems must continuously improve to handle massive data processing. However, to ensure proper operation, effective heat dissipation is also crucial. Currently, communication equipment primarily uses fans for forced convection to achieve cooling. However, under increasingly demanding system conditions, concentrating airflow to effectively improve fan efficiency while maintaining consistent noise levels has been a persistent industry goal. It is known that during operation, some airflow from a diagonal-flow fan disperses and flows into the return space within the upper frame, creating turbulence. Due to the high speed and large flow rate of this turbulence, the fan airflow becomes unconcentrated, leading to reduced fan performance, pressure leakage, and even fan stall.

[0003] In view of this, it is necessary to provide a diagonal flow fan with multiple chambers to solve the problems and deficiencies faced by the prior art. Utility Model Content

[0004] The purpose of this application is to provide a mixed-flow fan with multiple chambers, which divides a single recirculation space into multiple chambers through multiple non-return pressurization structures, forming a self-circulating flow field in each chamber, thereby eliminating turbulence in the recirculation space, so as to improve fan characteristics and reduce noise.

[0005] To achieve the aforementioned objectives, this application provides a diagonal flow fan, comprising: a frame including an air inlet, an air outlet, a receiving space, and a guide wall; the air inlet and the air outlet are respectively disposed on two opposite sides of the frame and communicate with each other through the receiving space; the guide wall extends axially from the periphery of the air inlet into the receiving space; an inner wall of the guide wall connects to an upper frame sidewall of the frame and defines a return flow space with the upper frame sidewall; and an impeller housed in the frame. The body has a accommodating space and a guide ring that forms an airflow from the air inlet to the air outlet when it rotates; and a plurality of anti-reverse pressurization structures are disposed in the return space of the frame, connected to the inner wall of the guide wall and the side wall of the upper frame, and dividing the return space into a plurality of chambers; wherein, when the impeller rotates, a portion of the airflow forms an escape airflow between the guide ring and the side wall of the upper frame, the escape airflow flows into the plurality of chambers, and forms a self-circulating flow field in each chamber.

[0006] In one embodiment, the frame includes an upper frame and a lower frame, which are assembled together to form the air inlet, the air outlet and the accommodating space, wherein the air inlet, the guide wall, the upper frame sidewall, the return space, the plurality of backflow prevention pressurization structures and the plurality of chambers are disposed in the upper frame.

[0007] In one embodiment, the number of the plurality of check valve pressurization structures is between 5 and 30.

[0008] In one embodiment, each of the anti-reverse pressurization structures is a rib structure and has a first depth, the frame has a frame height, and the ratio of the first depth to the frame height is between 0.03 and 0.1.

[0009] In one embodiment, the ratio of the first depth to the frame height is 0.06.

[0010] In one embodiment, the reflux space has a reflux space area, each of the chambers has a chamber area, and the ratio of the chamber area to the reflux space area ranges from 0.02 to 0.1.

[0011] In one embodiment, the ratio of the chamber area to the reflux space area is 0.07.

[0012] In one embodiment, the plurality of anti-reverse pressurization structures include a plurality of main ribs and a plurality of connecting ribs, wherein the two ends of each connecting rib are respectively connected to a first end of one of the main ribs and a second end of an adjacent main rib.

[0013] In one embodiment, the main rib has a first width, the connecting rib has a second width, and the ratio of the second width to the first width is between 0.5 and 1.5.

[0014] In one embodiment, the ratio of the second width to the first width is 0.75.

[0015] In one embodiment, each of the anti-reverse pressurization structures is a rib structure, and the rib structure has a bottom surface with a plurality of grooves on the bottom surface, the number of which is between 2 and 5.

[0016] In one embodiment, the number of the plurality of grooves is 3.

[0017] In one embodiment, the rib structure has a first depth, the groove has a second depth, and the ratio of the second depth to the first depth is between 0.1 and 0.5.

[0018] In one embodiment, the ratio of the second depth to the first depth is 0.3.

[0019] In one embodiment, the rib structure has a rib length, the groove has a groove width, and the ratio of the groove width to the rib length is between 0.1 and 0.3.

[0020] In one embodiment, the ratio of the groove width to the rib length is 0.15.

[0021] In one embodiment, each of the anti-reverse pressurization structures is a rib structure, and the rib structure has a side surface with a plurality of serrated protrusions.

[0022] In one embodiment, the plurality of serrated protrusions are disposed on a side away from an axis and have a serration length, the rib structure has a rib length, and the ratio of the serration length to the rib length is 0.7.

[0023] In one embodiment, the rib structure has a rib length, each of the serrated protrusions has a serration height, and the ratio of the serration height to the rib length is between 0.1 and 0.5.

[0024] In one embodiment, the ratio of the serration height to the rib length is 0.2. Attached Figure Description

[0025] Figure 1A This is a structural diagram showing the appearance of the oblique flow fan of the first embodiment of this application from an overhead view.

[0026] Figure 1B This is a structural diagram showing the appearance of the diagonal flow fan of the first embodiment of this application from a bottom view.

[0027] Figure 1C This is an exploded view showing the diagonal flow fan of the first embodiment of this application.

[0028] Figure 2A It is shown Figure 1A The cross-sectional view of the upper frame shown.

[0029] Figure 2B It is shown Figure 1A The diagram shows the inner structure of the upper frame.

[0030] Figure 2C It is shown Figure 1A The top view of the upper frame shown.

[0031] Figure 3A It is shown Figure 2C The flow velocity simulation diagram of the upper frame is shown.

[0032] Figure 3B It is shown Figure 2C The diagram shows a velocity simulation of the self-circulating flow field within the chamber.

[0033] Figure 4A This is a comparison diagram showing the air pressure and efficiency of the diagonal flow fan of the prior art and the first embodiment of this application.

[0034] Figure 4B This is a comparison diagram showing the air pressure and noise of the diagonal flow fan of the prior art and the first embodiment of this application.

[0035] Figure 5A This is a cross-sectional view showing a diagonal flow fan according to a second embodiment of this application.

[0036] Figure 5B It is shown Figure 5A The diagram shows the inner structure of the upper frame.

[0037] Figure 5C It is shown Figure 5A The top view of the upper frame shown.

[0038] Figure 6A This is a cross-sectional view showing a diagonal flow fan according to a third embodiment of this application.

[0039] Figure 6B It is shown Figure 6A The diagram shows the inner structure of the upper frame.

[0040] Figure 6C It is shown Figure 6A The top view of the upper frame shown.

[0041] Figure 7A This is a cross-sectional view showing a diagonal flow fan according to the fourth embodiment of this application.

[0042] Figure 7B It is shown Figure 7A The diagram shows the inner structure of the upper frame.

[0043] Figure 7C It is shown Figure 7A The top view of the upper frame shown.

[0044] Explanation of reference numerals in the attached figures

[0045] 1, 1a, 1b, 1c: Diagonal flow fan,

[0046] 10: Frame,

[0047] 100: Storage space

[0048] 20: Upper frame,

[0049] 200: Air inlet

[0050] 21: Upper frame flat panel,

[0051] 22: Guide wall,

[0052] 220: Recirculation Space

[0053] 220A: Recirculation space area,

[0054] 221, 221a, 221b: Chambers

[0055] 221A1, 221A2, 221A3: Chamber area,

[0056] 222: Inner wall,

[0057] 23: Upper sidewall,

[0058] 24, 24a, 24b, 24c: Check valve pressurization structure

[0059] 240: Rib structure,

[0060] 240a: Top surface,

[0061] 240b: Bottom surface,

[0062] 240c: Side view,

[0063] 241: Main rib,

[0064] 241a: First end,

[0065] 241b: Second end

[0066] 242: Connecting rib,

[0067] 243: Groove,

[0068] 243a: End,

[0069] 244: Serrated protrusion,

[0070] 244a: Top,

[0071] 30: Lower frame

[0072] 300: Air vent,

[0073] 31: Lower frame flat panel,

[0074] 32: Base

[0075] 33: Quiet Leaf

[0076] 34: Shaft tube,

[0077] 40: Impeller,

[0078] 41: Wheel hub

[0079] 42: Columnar part

[0080] 43: Flow guide ring,

[0081] 44: Leaflets

[0082] 50: Rotor assembly,

[0083] 51: Magnetic shell,

[0084] 52: Magnet,

[0085] 53: Shaft,

[0086] 54: Bearings

[0087] 60: Stator assembly,

[0088] 61: Winding,

[0089] 62: Circuit board,

[0090] F: airflow

[0091] F1: Exhaust airflow

[0092] F2: Self-circulating flow field

[0093] C: Axial direction

[0094] D1: First Depth

[0095] D2: Second Depth

[0096] D3: Sawtooth height

[0097] H: Frame height

[0098] L1: Rib length,

[0099] L2: Groove width

[0100] L3: Sawtooth length

[0101] W: Width

[0102] W1: First width

[0103] W2: Second width. Detailed Implementation

[0104] Some typical embodiments embodying the features and advantages of this application will be described in detail in the following description. It should be understood that this application can have various variations in different ways, all of which do not depart from the scope of this application, and the descriptions and drawings herein are for illustrative purposes only and not for limiting this application. For example, if the following description of this application stating that a first feature is disposed on or above a second feature indicates that it includes embodiments where the first and second features are in direct contact, and also includes embodiments where additional features can be disposed between the first and second features, so that the first and second features may not be in direct contact. Furthermore, different embodiments in this application may use repeated reference numerals and / or designations. These repetitions are for simplification and clarity and are not intended to limit the relationships between the various embodiments and / or the described appearance structures. Moreover, to facilitate the description of the relationship between one component or feature in the drawings and another component(s) or feature(s), spatially related terms such as "below," "below," "lower part," "above," "upper part," and similar terms may be used. In addition to the orientations shown in the accompanying drawings, spatially related terms are used to cover different orientations of the device in use or operation. The device may also be otherwise positioned (e.g., rotated 90 degrees or located in other orientations), and the descriptions of the spatially related terms used will be interpreted accordingly. Furthermore, when a component is referred to as "connected to" or "coupled to" another component, it may be directly connected to or coupled to the other component, or there may be intervening components. Although the numerical ranges and parameters of the broad scope of this application are approximate, the values ​​are stated as precisely as possible in specific examples. Additionally, it is understood that while terms such as "first," "second," and "third" may be used in the claims to describe different components, these components should not be limited by these terms, and the components described accordingly in the embodiments are indicated by different component reference numerals. These terms are used to distinguish different components. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component without departing from the scope of the embodiments.

[0105] Please see Figure 1A , Figure 1B , Figure 2A and Figure 2B . Figure 1A This is a structural diagram showing the appearance of the oblique flow fan of the first embodiment of this application from an overhead view. Figure 1B This is a structural diagram showing the appearance of the diagonal flow fan of the first embodiment of this application from a bottom view. Figure 2A It is shown Figure 1A The cross-sectional view of the upper frame shown. Figure 2B It is shown Figure 1AThe diagram shows the inner structure of the upper frame. In this embodiment, the diagonal flow fan 1 mainly includes a frame 10, an impeller 40, and multiple backflow prevention and pressurization structures 24 (such as...). Figure 2A As shown). Figure 1A As shown, the frame 10 includes an upper frame 20 and a lower frame 30, which are assembled together to form an accommodating space 100 for accommodating the impeller 40. In this embodiment, the upper frame 20 is provided with an air inlet 200 and a guide wall 22. Figure 1B As shown, the lower frame 30 is provided with an air outlet 300, that is, the air inlet 200 and the air outlet 300 are respectively provided on two opposite sides of the frame 10 and are connected to each other through the accommodating space 100. In this embodiment, the upper frame 20 includes, for example, a square upper frame plate 21 disposed at the top of the upper frame 20, but is not limited thereto. The air inlet 200 is located in the upper frame 20, is circular and penetrates through the upper frame plate 21. The guide wall 22 has an annular curved surface in appearance and connects to the upper frame plate 21, extending downward from the periphery of the air inlet 200 into the accommodating space 100. And as... Figure 2B As shown, the inner wall 222 of the guide wall 22 is connected to the upper frame side wall 23 of the frame 10, and together with the upper frame side wall 23, defines a return space 220. Figure 2A As shown, the impeller 40 is housed within the receiving space 100 of the frame 10 and has a guide ring 43, forming an airflow F from the air inlet 200 to the air outlet 300 when rotating. Multiple check valve pressurization structures 24 are disposed within the return space 220 of the frame 10, connected to the inner wall 222 of the guide wall 22 and the side wall 23 of the upper frame, dividing the return space 220 into multiple chambers 221. Figure 2A As shown, a portion of the airflow F flows upward between the guide ring 43 and the upper frame sidewall 23, forming an escaping airflow F1. This escaping airflow F1 flows upward into multiple chambers 221 of the return space 220, forming a self-circulating flow field F2 in each chamber 221 to create an air wall that blocks part of the escaping airflow F1. In this way, most of the escaping airflow F1 is blocked outside the air wall of the self-circulating flow field F2, while a small amount of escaping airflow F1 continues to flow into multiple chambers 221, causing the flow velocity of the escaping airflow F1 to decrease, and the amount flowing out from between the lower edge of the guide ring 43 and the upper frame sidewall 23 to decrease, thus reducing the leakage of airflow F, thereby maintaining pressure and improving the characteristics of the diagonal flow fan 1.

[0106] Please continue reading. Figure 1B and Figure 1C . Figure 1C This is an exploded view showing a diagonal flow fan according to the first embodiment of this application. Figure 1BAs shown, the lower frame 30 includes a lower frame plate 31, a base 32, and multiple stationary blades 33. The lower frame plate 31 is spatially relative to the upper frame plate 21, and the two are generally parallel to each other. Multiple stationary blades 33 are disposed between the base 32 and the lower frame plate 31, with each stationary blade 33 connecting the base 32 and the lower frame plate 31 at both ends to form an air outlet 300, positioned between the lower frame plate 31 and the base 32. When the impeller 40 rotates, gas within the accommodating space 100 passes through the space between the stationary blades 33, the base 32, and the lower frame plate 31, and is discharged through the air outlet 300. In this embodiment, as... Figure 1C As shown, the frame 10 is assembled from an upper frame 20 and a lower frame 30. The upper frame 20, impeller 40, and lower frame 30 are arranged, for example, along an axial direction C, so that when the upper frame 20 and lower frame 30 are assembled, the impeller 40 is placed within the receiving space 100. In this embodiment, the impeller 40 includes a hub 41, a cylindrical portion 42, a guide ring 43, and a plurality of blades 44. The plurality of blades 44 of the impeller 40 are connected between the hub 41 and the guide ring 43.

[0107] Please see Figure 2A In some embodiments, the hub 41, cylindrical portion 42, guide ring 43, and multiple blades 44 may be, but are not limited to, integrally formed single-piece components. The bottom end of the hub 41 extends axially to form the cylindrical portion 42. The guide ring 43 is concentrically arranged with the hub 41, and the guide ring 43 is connected to the periphery of the hub 41 by multiple blades 44. In this embodiment, the multiple blades 44 are three-dimensionally curved. The inner end of each blade 44 is connected to the hub 41, and the outer end is connected to the inner ring wall of the guide ring 43. The cylindrical portion 42 drives the hub 41, multiple blades 44, and guide ring 43 to rotate, driving air to pass between the hub 41, multiple blades 44, and guide ring 43. In this embodiment, the base 32 of the lower frame 30 also includes a shaft tube 34. The stator assembly 60 includes, for example, a winding 61 and a circuit board 62, both of which are disposed on the periphery of the shaft tube 34. The rotor assembly 50 includes a magnetic housing 51, a magnet 52, and a rotating shaft 53. The magnetic housing 51 is disposed in the hollow portion within the cylindrical portion 42 of the impeller 40 and is connected to the rotating shaft 53. In this embodiment, the magnet 52 is disposed on the radial inner wall surface of the magnetic housing 51, spatially relative to the winding 61. The rotating shaft 53 is disposed at the center of the magnetic housing 51 and is disposed within the shaft tube 34 via at least one bearing 54. On the other hand, in this embodiment, the guide wall 22 extends downward from the periphery of the air inlet 200, while the top end of the guide ring 43 extends upward from the outer end of the blade 44. The upper frame 20 of the frame 10, the top end of the guide ring 43, and the guide wall 22 at least partially overlap radially.

[0108] Please also refer to Figure 2A , Figure 2B and Figure 2C. Figure 2C It is shown Figure 1A The image shows a bottom view of the upper frame. In this embodiment, multiple check valve pressurization structures 24 are disposed within the reflux space 220 of the frame 10, and each check valve pressurization structure 24 is connected to the inner wall 222 of the guide wall 22 of the annular curved surface and the side wall 23 of the upper frame. Figure 2B As shown, the check valve pressurization structure 24 can be, but is not limited to, a rib structure 240. In this embodiment, one end of the rib structure 240 is connected to the upper frame sidewall 23, and from the top surface 240a to the other end, it is connected to the curved inner wall 222. In this embodiment, the number of rib structures 240 is between 5 and 30, and is not limited thereto. The shape and number of the check valve pressurization structure 24 can be varied according to the actual implementation situation, and are not limited thereto. Multiple check valve pressurization structures 24 can divide the originally circular single reflux space 220 into multiple chambers 221. Figure 2A As shown, when the impeller 40 of the diagonal flow fan 1 rotates, it drives the airflow F to flow in from the air inlet 200 of the upper frame 20 and flow downwards out from the air outlet 300 of the lower frame 30. However, during operation, a portion of the airflow F flows upwards along the guide ring 43 of the impeller 40 and the side wall 23 of the upper frame, forming an escaping airflow F1. In this embodiment, when the escaping airflow F1 flows upwards into the return space 220, it is cut and flows into multiple chambers 221. A self-circulating flow field F2 is formed in the chambers 221, and the flow velocity of this self-circulating flow field F2 is reduced due to the obstruction of the chambers 221. Simultaneously, a self-circulating flow field F2 forms an air wall, thereby blocking part of the escaping airflow F1 and reducing its flow into chamber 221. Of course, the escaping airflow F1 within the self-circulating flow field F2 will also flow out of chamber 221. This creates a dynamic balance between the self-circulating flow field F2 and the external escaping airflow F1, thus slowing down the flow velocity of the escaping airflow F1, and preventing the airflow F from continuing to rise and form escaping airflow F1. This achieves the effect of concentrating the airflow F and improving fan performance.

[0109] like Figure 2A As shown, the check valve pressure structure 24 has a first depth D1, and the frame 10 has a frame height H. In this embodiment, the frame height H is defined by the upper frame 20 and the lower frame 30, that is, it is the sum of the heights of the upper frame 20 and the lower frame 30. As for the first depth D1 of the check valve pressure structure 24, it is as follows: Figure 2B As shown, the distance is defined as the distance between the top surface 240a and the bottom surface 240b of the rib structure 240. In this embodiment, the ratio of the first depth D1 of the anti-reverse pressure structure 24 to the frame height H of the frame 10 ranges from 0.03 to 0.1. Preferably, the ratio of the first depth D1 to the frame height H is 0.06, but it is not limited thereto.

[0110] Please continue reading. Figure 2CAs shown in the figure, each rib structure 240 has a width W. The width W is defined by the distance between two opposite sides 240c of the rib structure 240. In this embodiment, the width W of each rib structure 240 is the same. In other embodiments, the width W of each rib structure 240 may be different, and its width can be varied according to the actual implementation. In this embodiment, the reflux space 220 has a reflux space area 220A, which is calculated from the annular area of ​​the reflux space 220. And each chamber 221 has a chamber area 221A1, 221A2, 221A3... In this embodiment, the area of ​​each chamber area 221A1, 221A2, 221A3... is the same, but it is not limited thereto. In some embodiments, the ratio of each chamber area 221A1 (or 221A2, or 221A3) to the reflux space area 220A ranges from 0.02 to 0.1. Preferably, the ratio of each chamber area 221A1 (or 221A2, or 221A3) to the reflux space area 220A is 0.07, but is not limited thereto.

[0111] Please also refer to Figure 3A and Figure 3B . Figure 3A It is shown Figure 2C The flow velocity simulation diagram of the upper frame is shown. Figure 3B It is shown Figure 2C The diagram shows a velocity simulation of the self-circulating flow field within the chamber. Figure 3A As shown, the airflow velocity at the air inlet 200 in the center of the upper frame 20 of the oblique flow fan 1 is extremely high, thus revealing a large bright area. However, when the aforementioned airflow F forms an escaping airflow F1 and flows into each chamber 221 to form a self-circulating flow field F2, the wind speed drops significantly. Therefore, as... Figure 3A As can be seen, dark areas are displayed within the chambers, representing a significant decrease in flow velocity within each chamber 221. Simultaneously, in conjunction with... Figure 3B It can be seen that within each chamber 221, the wind direction and velocity of the cyclone flow generated by the self-circulating flow field F2 are observed. This self-circulating flow field F2 forms a cyclone within the chamber 221, thereby creating an air wall effect and blocking most of the escaping airflow F1. This reduces the velocity of the escaping airflow F1 outside the chamber 221 and effectively decreases the escaping airflow F1.

[0112] Please also refer to Figure 4A and Figure 4B . Figure 4A This is a comparison diagram showing the air pressure and efficiency of the diagonal flow fan of the prior art and the first embodiment of this application. Figure 4B This is a comparison diagram showing the air pressure and noise of a diagonal flow fan in the prior art and the first embodiment of this application. (See diagram for reference.) Figure 4AIt is evident that, in the range of 20 to 70 cubic feet per minute (CFM), the air pressure of a commonly known fan drops rapidly, from 140 mmHg. 2 O dropped to 110 mmH 2 The significant reduction in performance is primarily due to the fact that known diagonal-flow fans generate runoff airflow. This runoff airflow moves rapidly within a single recirculation space, causing turbulence and resulting in a noticeable stall zone, thus affecting the overall fan characteristics. In contrast, at almost the same efficiency, the diagonal-flow fan 1 of the first embodiment of this application exhibits remarkably stable air pressure performance, without the stall zone present in the known technology. In other words, the diagonal-flow fan 1 of the first embodiment of this application demonstrates significantly more stable air pressure compared to the known technology, thus possessing superior characteristics. Figure 4B As shown, the oblique flow fan 1 of the first embodiment of this application also has a stable air pressure compared to the prior art. In addition, the noise of the oblique flow fan 1 of this application is significantly reduced compared to the prior art. It can be seen that the oblique flow fan 1 of the first embodiment of this application divides the return space 220 into multiple chambers 221 through multiple anti-reverse pressurization structures 24, so that the escaping airflow F1 flows into multiple chambers 221 in the return space 220, and generates a self-circulating flow field F2 in each chamber 221 to create an air wall, thereby blocking part of the escaping airflow F1, reducing the amount of it flowing into the chamber 221. Since the escaping airflow F1 in the self-circulating flow field F2 also flows out of the chamber 221, a dynamic balance is formed between the self-circulating flow field F2 and the external escaping airflow F1, so that the flow velocity of the escaping airflow F1 decreases and the leakage of airflow F decreases, thereby achieving a pressure holding effect, and achieving the effects of concentrating airflow, improving performance and reducing noise.

[0113] Please also refer to Figure 5A , Figure 5B and Figure 5C . Figure 5A This is a cross-sectional view showing a diagonal flow fan according to a second embodiment of this application. Figure 5B It is shown Figure 5A The diagram shows the inner structure of the upper frame. Figure 5C It is shown Figure 5AThe image shows a bottom view of the upper frame. In this embodiment, the diagonal flow fan 1a is similar to the diagonal flow fan 1 shown in the first embodiment, and the same component labels represent the same components, structures, and functions, which will not be described again here. In this embodiment, the diagonal flow fan 1a also includes a frame 10, an impeller 40, and multiple backflow prevention pressurization structures 24a. The frame 10 includes an upper frame 20a and a lower frame 30, which are assembled together to form a receiving space 100 for accommodating the impeller 40. In this embodiment, the air inlet 200 is located on the upper frame 20a, is circular, and penetrates the upper frame plate 21. The guide wall 22 is connected to the upper frame plate 21 and extends downward from the periphery of the air inlet 200 into the receiving space 100. The impeller 40 is accommodated in the receiving space 100 of the frame 10 and has a guide ring 43, which forms an airflow from the air inlet 200 to the air outlet 300 when rotating. Figure 5B and Figure 5C As shown, the inner wall 222 of the guide wall 22 is connected to the upper frame side wall 23 of the frame 10, and together with the upper frame side wall 23, defines a return space 220. Multiple check valve pressurization structures 24a are disposed in the return space 220 of the frame 10, connected to the inner wall 222 of the guide wall 22 and the upper frame side wall 23, and divide the return space 220 into multiple chambers 221a and 221b.

[0114] In this embodiment, as Figure 5B and Figure 5C As shown, the multiple check valve pressurization structures 24a include multiple main ribs 241 and multiple connecting ribs 242. Each main rib 241 has two opposing first ends 241a and second ends 241b. The first end 241a is connected to the upper frame sidewall 23, and the second end 241b is connected to the inner wall 222. Each connecting rib 242 is connected at both ends to the first end 241a of one of the main ribs 241 and the second end 241b of an adjacent main rib 241. That is, each connecting rib 242 is obliquely connected to different ends 241a and 241b of two adjacent main ribs 241. In this way, the multiple main ribs 241 and connecting ribs 242 divide the reflux space 220 into multiple triangular chambers 221a and 221b. In this embodiment, the triangular chambers 221a and 221b are equivalent to further dividing the chamber 221 in the first embodiment in half to form these smaller chambers 221a and 221b. In this embodiment, as Figure 5C As shown, each main rib 241 has a first width W1. Each connecting rib 242 has a second width W2. In this embodiment, the ratio of the second width W2 to the first width W1 ranges from 0.5 to 1.5. Preferably, the ratio of the second width W2 to the first width W1 is 0.75, but it is not limited thereto.

[0115] like Figure 5A , Figure 5CAs shown, when the diagonal flow fan 1a operates, a portion of the airflow flows upward between the guide ring 43 of the impeller 40 and the side wall 23 of the upper frame, forming an escaping airflow. In this embodiment, when the escaping airflow flows upward into the return space 220, it is cut and flows into multiple triangular chambers 221a and 221b. A small self-circulating flow field is formed in these smaller chambers 221a and 221b, and the flow velocity of the self-circulating flow field is reduced due to the obstruction of the chambers 221a and 221b, forming an air wall to block part of the escaping airflow, reducing the amount flowing into the chambers 221a and 221b, and slowing down the flow velocity of the escaping airflow to reduce airflow leakage. In this way, the effects of concentrating the airflow, improving fan performance, and reducing noise can be achieved.

[0116] Please also refer to Figure 6A , Figure 6B and Figure 6C . Figure 6A This is a cross-sectional view showing a diagonal flow fan according to a third embodiment of this application. Figure 6B It is shown Figure 6A The diagram shows the inner structure of the upper frame. Figure 6C It is shown Figure 6A The top view of the upper frame shown. In this embodiment, the diagonal flow fan 1b and... Figures 1A to 5C The diagonal flow fans 1 and 1a shown are similar, and the same component labels represent the same components, structures, and functions, which will not be described again here. In this embodiment, the diagonal flow fan 1b also includes a frame 10, an impeller 40, and multiple backflow prevention and pressurization structures 24b, and the frame 10 is also composed of an upper frame 20b and a lower frame 30 assembled together, and can accommodate the impeller 40. In this embodiment, the multiple backflow prevention and pressurization structures 24b are connected to the inner wall 222 of the guide wall 22 and the side wall 23 of the upper frame, and divide the return flow space 220 into multiple chambers 221.

[0117] In this embodiment, such as Figure 6B and Figure 6C As shown, each check valve pressurization structure 24b is a rib structure 240. The rib structure 240 has a bottom surface 240b, and the bottom surface 240b has multiple grooves 243. In this embodiment, the grooves 243 are triangular groove structures, but are not limited thereto. In this embodiment, the multiple grooves 243 of the rib structure 240 of the check valve pressurization structure 24b are mainly used to cut the flow field inside the return space 220, thereby improving the turbulence. In some embodiments, the number of multiple grooves 243 may be, but is not limited to, between 2 and 5. Preferably, the number of multiple grooves 243 is 3, but is not limited thereto. Figure 6AAs shown, the rib structure 240 has a first depth D1, and the groove 243 has a second depth D2. In this embodiment, the first depth D1 of the rib structure 240 is the same as in the previous embodiment, defined by the distance from its top surface 240a to its bottom surface 240b. The second depth D2 of the groove 243 is defined by the distance between the inwardly recessed end 243a of the groove 243 and the bottom surface 240b of the rib structure 240. In some embodiments, the ratio of the second depth D2 to the first depth D1 ranges from 0.1 to 0.5. Preferably, the ratio of the second depth D2 to the first depth D1 is 0.3, but this is not a limitation. Figure 6C As shown, the rib structure 240 has a rib length L1, and the groove 243 has a groove width L2. In this embodiment, the ratio of groove width L2 to rib length L1 ranges from 0.1 to 0.3. Preferably, the ratio of groove width L2 to rib length L1 is 0.15, but it is not limited thereto.

[0118] like Figure 6A , Figure 6C As shown, when the diagonal flow fan 1b operates, a portion of the airflow flows upward between the guide ring 43 of the impeller 40 and the side wall 23 of the upper frame, forming an escaping airflow. In this embodiment, when the escaping airflow flows upward into the return space 220, it is cut by multiple grooves 243 on the bottom surface 240b of the rib structure 240, and then flows into multiple chambers 221. The multiple grooves 243 divide the large turbulence into small turbulence, thereby reducing the turbulent kinetic energy generated by the self-circulating flow field in the chamber 221. At the same time, the flow velocity inside the self-circulating flow field in the chamber 221 is further reduced, forming an air wall to block part of the escaping airflow, reducing the amount flowing into the chamber 221, thus slowing down the flow velocity of the escaping airflow and reducing airflow leakage. In this way, the effects of concentrating the airflow, improving fan characteristics, and reducing noise can be achieved.

[0119] Please also refer to Figure 7A , Figure 7B and Figure 7C . Figure 7A This is a cross-sectional view showing a diagonal flow fan according to the fourth embodiment of this application. Figure 7B It is shown Figure 7A The diagram shows the inner structure of the upper frame. Figure 7C It is shown Figure 7A The top view of the upper frame shown. In this embodiment, the diagonal flow fan 1c and... Figures 1A to 6CThe diagonal flow fans 1, 1a, and 1b shown are similar, and the same component labels represent the same components, structures, and functions, which will not be described again here. In this embodiment, the diagonal flow fan 1c also includes a frame 10, an impeller 40, and multiple backflow prevention pressurization structures 24c. The frame 10 is also composed of an upper frame 20c and a lower frame 30 assembled together, and can accommodate the impeller 40. Similarly, the multiple backflow prevention pressurization structures 24c are connected to the inner wall 222 of the guide wall 22 and the side wall 23 of the upper frame, and divide the return flow space 220 into multiple chambers 221.

[0120] like Figure 7B and Figure 7C As shown, each anti-reverse pressure structure 24c is a rib structure 240, and the rib structure 240 has two opposing side surfaces 240c. In this embodiment, the difference from the previous embodiment is that the side surfaces 240c of the rib structure 240 are provided with multiple serrated protrusions 244. The serrated protrusions 244 can be, but are not limited to, triangular protrusions. Furthermore, in this embodiment, the serrated protrusions 244 do not completely cover the side surfaces 240c of the rib structure 240. Figure 7C As shown, a plurality of serrated protrusions 244 are disposed on a side away from the axis and have a serration length L3 and a serration height D3. The serration length L3 is defined by the distance between the two ends of the plurality of serrated protrusions 244, and the serration height D3 is defined by the distance between the top end 244a of the serrated protrusions 244 and the side surface 240c of the rib structure 240. Similarly, the rib structure 240 has a rib length L1. In this embodiment, the ratio of serration height D3 to rib length L1 ranges from 0.1 to 0.5. Preferably, the ratio of serration height D3 to rib length L1 is 0.2, but is not limited thereto. In some embodiments, the ratio of serration length L3 to rib length L1 is 0.7, but is not limited thereto. In other words, multiple serrated protrusions 244 are disposed on 70% of the periphery of the side 240c of the rib structure 240 to cut the flow field within the chamber 221 and reduce large turbulence to small turbulence, thereby reducing noise.

[0121] Of course, the aforementioned technical features of the diagonal flow fans 1, 1a, 1b, and 1c in this application can be combined and varied according to actual application requirements. In addition, the detailed structures of the back pressure-blocking structures 24, 24a, 24b, and 24c in this application can also be adjusted according to actual applications, and this application is not limited thereto.

[0122] In summary, this application provides a diagonal flow fan with multiple chambers, which divides a single recirculation space into multiple chambers through multiple backflow prevention and pressurization structures. A self-circulating flow field is formed within each chamber to create an air wall, thereby eliminating turbulence in the recirculation space and reducing airflow leakage, thus improving fan performance and reducing noise. This application is open to various modifications by those skilled in the art, all of which shall be protected by the appended claims.

Claims

1. A diagonal-flow fan, characterized in that, include: A frame includes an air inlet, an air outlet, a receiving space, and a guide wall. The air inlet and the air outlet are respectively located on opposite sides of the frame and are connected to each other through the receiving space. The guide wall extends axially from the periphery of the air inlet into the receiving space. An inner wall of the guide wall connects to an upper frame sidewall of the frame and defines a return space with the upper frame sidewall. An impeller is housed in the receiving space of the frame and has a guide ring, which forms an airflow from the air inlet to the air outlet when it rotates; as well as Multiple check valve pressurization structures are disposed in the reflux space of the frame, connected to the inner wall of the guide wall and the side wall of the upper frame, and divide the reflux space into multiple chambers; When the impeller rotates, a portion of the airflow forms an escaping airflow between the guide ring and the upper frame sidewall. The escaping airflow flows into the plurality of chambers and forms a self-circulating flow field in each of the chambers.

2. The diagonal flow fan according to claim 1, characterized in that, The frame includes an upper frame and a lower frame, which are assembled together to form the air inlet, the air outlet and the accommodating space, wherein the air inlet, the guide wall, the upper frame side wall, the return space, the multiple backflow prevention pressurization structures and the multiple chambers are disposed in the upper frame.

3. The diagonal flow fan according to claim 1, characterized in that, The number of these multiple check valve pressurization structures ranges from 5 to 30.

4. The diagonal flow fan according to claim 1, characterized in that, Each of the anti-reverse pressurization structures is a rib structure and has a first depth. The frame has a frame height, and the ratio of the first depth to the frame height is between 0.03 and 0.

1.

5. The diagonal flow fan according to claim 4, characterized in that, The ratio of the first depth to the frame height is 0.

06.

6. The diagonal flow fan according to claim 1, characterized in that, The reflux space has a reflux space area, and each chamber has a chamber area, the ratio of the chamber area to the reflux space area ranging from 0.02 to 0.

1.

7. The diagonal flow fan according to claim 6, characterized in that, The ratio of the chamber area to the reflux space area is 0.

07.

8. The diagonal flow fan according to claim 1, characterized in that, The multiple anti-reverse pressure structure includes multiple main ribs and multiple connecting ribs, with each connecting rib having its two ends connected to a first end of one of the main ribs and a second end of an adjacent main rib.

9. The diagonal flow fan according to claim 8, characterized in that, The main rib has a first width, and the connecting rib has a second width, the ratio of the second width to the first width being between 0.5 and 1.

5.

10. The diagonal flow fan according to claim 9, characterized in that, The ratio of the second width to the first width is 0.

75.

11. The diagonal flow fan according to claim 1, characterized in that, Each of the anti-reverse pressure structures is a rib structure, and the rib structure has a bottom surface with a plurality of grooves on the bottom surface, the number of which is between 2 and 5.

12. The diagonal flow fan according to claim 11, characterized in that, The number of these grooves is 3.

13. The diagonal flow fan according to claim 11, characterized in that, The rib structure has a first depth, the groove has a second depth, and the ratio of the second depth to the first depth is between 0.1 and 0.

5.

14. The diagonal flow fan according to claim 13, characterized in that, The ratio of the second depth to the first depth is 0.

3.

15. The diagonal flow fan according to claim 11, characterized in that, The rib structure has a rib length, the groove has a groove width, and the ratio of the groove width to the rib length is between 0.1 and 0.

3.

16. The diagonal flow fan according to claim 15, characterized in that, The ratio of the groove width to the rib length is 0.

15.

17. The diagonal flow fan according to claim 1, characterized in that, Each of the anti-reverse pressure structures is a rib structure, and the rib structure has a side surface with multiple serrated protrusions.

18. The diagonal flow fan according to claim 17, characterized in that, The plurality of serrated protrusions are disposed on a side away from an axis and have a serration length, the rib structure has a rib length, and the ratio of the serration length to the rib length is 0.

7.

19. The diagonal flow fan according to claim 17, characterized in that, The rib structure has a rib length, each of the serrated protrusions has a serration height, and the ratio of the serration height to the rib length is between 0.1 and 0.

5.

20. The diagonal flow fan according to claim 19, characterized in that, The ratio of the serration height to the rib length is 0.2.

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