mixed flow fan

Abstract

This disclosure provides a diagonal flow fan, including a frame and an impeller. The frame includes an air inlet, an air outlet, a receiving space, and a guide wall. The air inlet and air outlet are respectively disposed on two 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. The impeller is housed in the receiving space of the frame and forms an airflow from the air inlet to the air outlet when it rotates. The outer diameter of the impeller hub gradually widens from the air inlet side towards the air outlet, causing the airflow to gradually widen around the periphery of the impeller. The impeller includes a conical shroud. The inner wall of the frame and the outer wall and top of the conical shroud are generally spaced apart, forming a return flow channel including an intake section, a horizontal flow section, and an exhaust section. The intake section is adjacent to the bottom end of the conical shroud and is connected to the exhaust section through the horizontal flow section. The guide wall shields the top of the conical shroud to form the exhaust section. The recirculated flow originates from the intake section, passes through the advection section, and is then discharged through the exhaust section, converging with the airflow.

Description

Technical Field

[0001] This disclosure relates to a diagonal flow fan, and more particularly to a diagonal flow fan with an optimized chamber to reduce backflow into the chamber and eliminate turbulence zones in the chamber, thereby improving fan performance and reducing noise. Background Technology

[0002] As the computational and data transmission demands of communication systems increase, the performance and power consumption of electronic components within these systems must continuously improve to handle the 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. But under increasingly demanding system conditions, effectively improving fan efficiency while maintaining similar noise levels has been a persistent industry goal.

[0003] In view of this, it is necessary to provide an optimized chamber-type diagonal flow fan that can reduce backflow into the chamber and eliminate turbulence zones in the empty chamber, thereby improving fan performance and reducing noise, in order to address the deficiencies of the existing technology. Summary of the Invention

[0004] The purpose of this disclosure is to provide an optimized chamber-type diagonal flow fan that reduces backflow into the chamber and eliminates turbulence zones in the empty chamber, thereby improving fan performance and reducing noise.

[0005] Another objective of this disclosure is to provide a diagonal flow fan. The impeller hub gradually widens in outer diameter from the inlet side towards the outlet, causing the airflow to gradually widen around the impeller's periphery, thus forming the main characteristic of a diagonal flow fan. By interlocking the guide wall on the frame with the top of the impeller conical shroud, the inlet flow channel diameter being smaller than the outlet flow channel diameter, and the top of the conical shroud extending upwards from the blade tip, the diagonal flow fan achieves characteristics similar to a centrifugal fan in reducing the stall zone. Because the inner wall of the frame and the outer wall and top of the conical shroud are designed to be parallel to each other and maintain a generally consistent distance, a recirculation channel is formed. This allows the recirculation flow to gradually decrease in velocity and kinetic energy after entering the recirculation channel from the intake section, thereby increasing the wind resistance between the inner wall of the frame and the outer wall and top of the conical shroud, reducing the recirculation entering the recirculation channel, and simultaneously eliminating the turbulence intensity of the recirculation channel. Furthermore, the balance holes on the impeller can be configured to correspond to the horizontal flow section of the recirculation channel. On the other hand, the flow direction of the discharge section of the return channel is the same as the direction of the airflow generated when the impeller rotates. When the return flow merges with the airflow, it is not easy for flow field collisions to occur, thus reducing the noise during operation.

[0006] To achieve the aforementioned objectives, this disclosure provides a diagonal flow fan, including a frame and an impeller. The frame includes an air inlet, an air outlet, a receiving space, and a guide wall. The air inlet and air outlet are respectively located on opposite sides of the frame and are connected to each other through the receiving space. The guide wall 2 is connected to an inner wall surface of the frame and extends axially from the periphery of the air inlet into the receiving space. The impeller is housed in the receiving space of the frame and, upon rotation, forms an airflow from the air inlet to the air outlet. The hub of the impeller gradually widens in outer diameter from the air inlet side towards the air outlet, causing the airflow to gradually widen around the periphery of the impeller. The impeller includes a conical shroud. The inner wall of the frame and an outer wall and top of the conical shroud are generally spaced apart to form a backflow channel. The backflow channel includes at least an intake section, a horizontal flow section and an exhaust section. The intake section is located adjacent to the bottom of the conical shroud and is connected to the exhaust section through the horizontal flow section. The guide wall at least partially covers the top of the conical shroud to form the exhaust section. When the airflow flows from the air inlet to the air outlet, a backflow flows from the intake section through the horizontal flow section and then is discharged from the exhaust section to merge with the airflow. Attached Figure Description

[0007] Figure 1 This is an external structural diagram of the oblique flow fan of the first embodiment of the present disclosure from an overhead view.

[0008] Figure 2 This is a structural view of the oblique flow fan according to the first embodiment of the present disclosure from a bottom view.

[0009] Figure 3 This is an exploded view of the diagonal flow fan according to the first embodiment of the present disclosure.

[0010] Figure 4A This is a structural diagram of the impeller according to the first embodiment of the present disclosure.

[0011] Figure 4B This is a cross-sectional view of the impeller according to the first embodiment of the present disclosure.

[0012] Figure 5 This is a cross-sectional structural diagram of the diagonal flow fan according to the first embodiment of the present disclosure.

[0013] Figure 6 This is a cross-sectional view of the diagonal flow fan according to the first embodiment of the present disclosure.

[0014] Figure 7 It is public Figure 6 A magnified view of the central region P1.

[0015] Figure 8A This is a structural diagram of the impeller according to the second embodiment of the present disclosure.

[0016] Figure 8BThis is a cross-sectional view of the impeller according to the second embodiment of the present disclosure.

[0017] Figure 9 This is a cross-sectional view of the diagonal flow fan according to the second embodiment of the present disclosure.

[0018] Figure 10 It is public Figure 9 A magnified view of the central region P2.

[0019] Figure 11 This is a structural diagram of the oblique flow fan according to the third embodiment of the present disclosure.

[0020] Figure 12 This is a cross-sectional view of a diagonal flow fan according to a third embodiment of the present disclosure.

[0021] Figure 13 It is public Figure 12 A magnified view of the central region P3.

[0022] Figure 14 This is a structural diagram of the oblique flow fan according to the fourth embodiment of the present disclosure.

[0023] Figure 15 This is a cross-sectional view of the diagonal flow fan according to the fourth embodiment of the present disclosure.

[0024] Figure 16 It is public Figure 15 A magnified view of the central region P4.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1, 1a, 1b, 1c: Diagonal flow fan

[0027] 10: Frame

[0028] 100: Storage space

[0029] 110: Inner wall surface

[0030] 20: Upper frame

[0031] 21: Upper frame flat panel

[0032] 22: Guide Wall

[0033] 30: Lower frame

[0034] 31: Lower frame flat plate

[0035] 32: Base

[0036] 33: Jingye

[0037] 34: Shaft tube

[0038] 35: Outer wall

[0039] 36: Cavity

[0040] 40, 40a, 40b, 40c: Impeller

[0041] 41: Wheel hub

[0042] 42: Columnar part

[0043] 43: Cone mask

[0044] 430: Outer wall surface

[0045] 44: Leaf

[0046] 45: Balance hole

[0047] 50: Air Inlet

[0048] 60: Air vent

[0049] 70: Magnetic housing

[0050] 71: Magnet

[0051] 72: Shaft

[0052] 73: Bearings

[0053] 80: Winding

[0054] 81: Circuit board

[0055] 82: Electronic Components

[0056] 90: Return Channel

[0057] 91: Inhalation segment

[0058] 92: Stratoflow section

[0059] 921: First Advection Phase

[0060] 922: Second Advection Phase

[0061] 923: Connected segments

[0062] 93: Discharge section

[0063] AF: Airflow

[0064] BF: Reflux

[0065] C: Axial

[0066] G: Gap distance

[0067] ID1: Inlet flow channel diameter

[0068] ID2: Air outlet flow channel diameter

[0069] OD1: Frame outer diameter

[0070] P1, P2, P3, P4: Regions

[0071] X, Y, Z: Axes Detailed Implementation

[0072] Some typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can have various variations in different implementations without departing from the scope of this disclosure, and the descriptions and drawings herein are for illustrative purposes only and not for limiting the scope of this disclosure. For example, if the following description of this disclosure placing a first feature on or above a second feature indicates that it includes embodiments where the first and second features are in direct contact, as well as embodiments where additional features may be placed between the first and second features, so that the first and second features may not be in direct contact. Furthermore, different embodiments in this disclosure may use repeated reference numerals and / or markings. 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 and another (plural) component or feature in the drawings, 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 relevant 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 relevant 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 disclosure are approximate, values ​​are stated as precisely as possible in specific examples. Additionally, it is understood that although 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 represented by different component symbols. 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.

[0073] Figure 1This is a top-view structural diagram of the oblique flow fan according to the first embodiment of the present disclosure. In this embodiment, the oblique flow fan 1 mainly includes a frame 10 and an impeller 40. The frame 10 includes an upper frame 20 and a lower frame 30, which are assembled together to form a receiving space 100 for accommodating the impeller 40. In this embodiment, the upper frame 20 is provided with an inlet 50 and a guiding wall 22. The guiding wall 22 extends downward from the periphery of the inlet 50 along an axial direction C into the receiving space 100. The hub 41 of the impeller 40 is exposed through the inlet 50. 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, and the inlet 50 is located on the upper frame 20, is circular, and penetrates the upper frame plate 21. The guide wall 22 has an annular curved surface and is connected to the upper frame plate 21. It extends downward from the periphery of the air inlet 50 into the accommodating space 100 so that when the impeller 40 rotates, it can guide the gas into the accommodating space 100.

[0074] Figure 2 This is a structural view of the oblique flow fan according to the first embodiment of the present disclosure from a lower perspective. In this embodiment, the lower frame 30 includes a lower frame plate 31, a base 32, and a plurality of static blades 33. The lower frame plate 31 is spatially parallel to the upper frame plate 21. The plurality of static blades 33 are disposed between the base 32 and the lower frame plate 31, with each static blade 33 having its two ends connected between the base 32 and the lower frame plate 31 to form an outlet 60, which is located between the lower frame plate 31 and the base 32. When the impeller 40 rotates, the gas in the accommodating space 100 passes through the space between the static blades 33, the base 32, and the lower frame plate 31, and is discharged through the outlet 60.

[0075] Figure 3This is an exploded view of a diagonal-flow fan according to a first embodiment of the present disclosure. In this embodiment, 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 the impeller 40 is placed within the receiving space 100 when the upper frame 20 and lower frame 30 are assembled. In this embodiment, the impeller 40 includes a hub 41, a cylindrical part 42, a conical section shell 43, a plurality of blades 44, and a plurality of balance holes 45. The plurality of blades 44 of the impeller 40 are connected between the hub 41 and the conical section shell 43. The plurality of balance holes 45 are disposed on the top surface of the conical section shell 43. The number, shape, and size of the plurality of balance holes 45 can be varied according to actual application requirements, and the present disclosure is not limited thereto.

[0076] Figure 4A This is a structural diagram of the impeller according to the first embodiment of the present disclosure. In this embodiment, the hub 41, cylindrical portion 42, conical cover 43, plurality of blades 44, and plurality of balancing holes 45 are integrally formed single components. The bottom end of the hub 41 extends axially to form the cylindrical portion 42. The conical cover 43 is concentrically arranged with the hub 41, and the conical cover 43 is connected to the periphery of the hub 41 through the plurality of blades 44. In this embodiment, the plurality of 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 annular wall of the conical cover 43. The cylindrical portion 42 drives the hub 41, the plurality of blades 44, and the conical cover 43 to rotate, driving air to pass between the hub 41, the plurality of blades 44, and the conical cover 43.

[0077] Figure 4B This is a cross-sectional view of the impeller according to the first embodiment of the present disclosure. In this embodiment, a plurality of blades 44 are arranged around the periphery of the hub 41, and the top of the conical shroud 43 extends upward from the tip of the blades 44, such that the top of the conical shroud 43 is higher than the top of the hub 41 and the tip of the conical shroud 43 where the plurality of blades 44 connect. The top of the hub 41 is lower than the top of the conical shroud 43. The outer diameter of the hub 41 of the impeller 40 gradually widens from the air inlet 50 side towards the air outlet.

[0078] Figure 5This is a cross-sectional structural diagram of the diagonal flow fan according to the first embodiment of the present disclosure. In this embodiment, the base 32 of the lower frame 30 further includes a tube 34. The stator assembly includes, for example, a winding 80 and a printed circuit board 81, both of which are disposed around the periphery of the tube 34. The rotor assembly includes a shell 70, a magnet 71, and a shaft 72. The shell 70 is disposed in the hollow portion within the cylindrical portion 42 of the impeller 40 and is connected to the shaft 72. In this embodiment, the magnet 71 is disposed on the radial inner wall surface of the shell 70, spatially relative to the winding 80. The shaft 72 is disposed at the center of the shell 70 and is disposed within the tube 34 via at least one bearing 73. On the other hand, in this embodiment, the guide wall 22 extends downward from the periphery of the air inlet 50, while the top of the conical shroud 43 extends upward from the outer end of the blade 44. The upper frame 20 of the frame 10, the top of the conical shroud 43, and the guide wall 22 at least partially overlap radially. The integrally formed upper frame 20 and guide wall 22 are generally parallel to the air inlet side of the conical shroud 43, so that a backflow channel 90 is formed between the outer side of the upper frame 20 of the frame 10 and the conical shroud 43 and the inner side of the guide wall 22. The backflow channel 90 is multi-segmented and can change the flow direction.

[0079] Figure 6This is a cross-sectional view of the diagonal flow fan according to the first embodiment of the present disclosure. In this embodiment, the rotor assembly and stator assembly are housed between the impeller 40 and the lower frame 30. A chamber 36 is further formed between the outer wall 35 of the base 32 and the shaft tube 34, assembling an electronic component 82 housed on the circuit board 81. The top of the base 32 corresponds to the periphery of the cylindrical portion 42. In this embodiment, when the impeller 40 rotates, it forms an airflow AF from the air inlet 50 to the air outlet 60. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is drawn in through the air inlet 50, passes through the plurality of blades 44 and between the hub 41 and the conical shroud 43, and then passes through the stationary blades 33, the base 32, and the lower frame plate 31, and is discharged through the air outlet 60. Because the outer diameter of the hub 41 of the impeller 40 gradually widens from the air inlet 50 towards the air outlet, the airflow AF also gradually widens around the periphery of the impeller 40. In this embodiment, the frame 10 has an outer diameter OD1, the air inlet 50 has an inlet diameter ID1, and the air outlet 60 has an outlet channel diameter ID2. The inlet channel diameter ID1 is smaller than the outlet channel diameter ID2. In this embodiment, the ratio of the inlet channel diameter ID1 to the outer diameter OD1 of the frame is between 0.5 and 0.7. Preferably, the ratio of the inlet channel diameter ID1 to the outer diameter OD1 of the frame is 0.56. In this embodiment, the ratio of the outlet diameter ID2 to the outer diameter OD1 of the frame is between 0.8 and 0.98. Preferably, the ratio of the outlet diameter ID2 to the outer diameter OD1 of the frame is 0.97. The diameter of the air inlet channel ID1 is smaller than the diameter of the air outlet channel ID2, and the top of the cone mask 43 extends upward from the tip of the blade 44.

[0080] Figure 7 It is public Figure 6 Enlarged view of region P1. In this embodiment, the inner wall 110 of the upper frame 20 and the outer wall 430 and top of the conical cover 43 are generally maintained at a distance G, forming the aforementioned return channel 90. In this embodiment, the distance G / outer diameter OD1 of the frame (see...) Figure 6The ratio ranges from 0.01 to 0.02. Preferably, the ratio of the spacing distance G to the outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 includes at least an intake section 91, a horizontal section 92, and an exhaust section 93. The intake section 91 is located at the bottom end of the conical mask 43 and communicates with the exhaust section 93 through the horizontal section 92. The guide wall 22 at least partially covers the top end of the conical mask 43 to form the exhaust section 93. The return flow BF is in the opposite direction to the intake section 91 and the exhaust section 93. The direction of the return flow BF in the horizontal section 92 is perpendicular to the axial direction C. The direction of the return flow BF in the exhaust section 93 is the same as the direction of the airflow AF. Because the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical mask 43 are designed to be parallel to each other and generally maintain a distance G to form multiple curved return channels 90, the return flow BF gradually decreases in velocity and kinetic energy after entering the return channel 90 from the suction section 91. Therefore, the wind resistance between the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical mask 43 can be increased, the return flow entering the return channel 90 can be reduced, and the turbulence intensity of the return channel 90 can be eliminated simultaneously. In this embodiment, the conical mask 43 includes a plurality of balance holes 45, which are arranged around the top of the conical mask 43, and the horizontal flow section 92 is spatially relative to the plurality of balance holes 45. In this embodiment, the corresponding lengths of the suction section 91, the horizontal flow section 92, and the discharge section 93 can be varied and curved by adjusting the frame 10, the impeller 40, and the guide wall 22. In other embodiments, the corresponding lengths and relative bending angles of the inhalation section 91, the advection section 92, and the discharge section 93 can be adjusted according to actual application requirements, and this disclosure is not limited thereto.

[0081] Figure 8AThis is a structural diagram of the impeller according to a second embodiment of the present disclosure. In this embodiment, the impeller 40a includes a hub 41, a cylindrical portion 42, a conical shield 43, a plurality of blades 44, and a plurality of balancing holes 45. The bottom end of the hub 41 is connected to the cylindrical portion 42, and the two are integrally formed. The conical shield 43 is concentrically arranged with the hub 41, and the conical shield 43 is connected to the outside of the hub 41 through the plurality of blades 44. In this embodiment, the plurality of blades 44 are three-dimensionally curved. The inner end of each blade 44 is connected to the hub 41, and the outer end of each blade is connected to the inner annular wall of the conical shield 43 to connect the opening above the conical shield 43 to the periphery of the cylindrical portion 42. The cylindrical portion 42 drives the hub 41, the plurality of blades 44, and the conical shield 43 to rotate, driving air to pass between the hub 41, the plurality of blades 44, and the conical shield 43. In this embodiment, the bottom end of the conical mask 43 protrudes radially outward to form an annular plane, and a plurality of balance holes 45 are arranged around the bottom end of the conical mask 43, located on the annular plane protruding outward from the bottom end, and the opening of each balance hole 45 faces upward.

[0082] Figure 8B This is a cross-sectional view of the impeller according to the second embodiment of the present disclosure. In this embodiment, a plurality of blades 44 are arranged around the periphery of the hub 41, and the top of the conical shroud 43 extends upward from the tip of the blades 44. The top of the conical shroud 43 forms a flat annular plane, which is higher than the tip of the conical shroud 43 where the plurality of blades 44 are connected, and also higher than the top of the hub 41. In this embodiment, the cylindrical portion 42 is, for example, annular and has a hollow portion, and is assembled to accommodate the rotor assembly and the stator assembly, so that the impeller 40a is driven to rotate by the rotor assembly and the stator assembly. The design variation of the balancing hole 45 further increases the application versatility of the impeller 40a.

[0083] Figure 9This is a cross-sectional view of the oblique flow fan according to the second embodiment of the present disclosure. In this embodiment, when the impeller 40a rotates, it forms an airflow AF from the air inlet 50 to the air outlet 60. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is drawn in through the air inlet 50, passes through a plurality of blades 44 and between the hub 41 and the conical shroud 43, and then passes through the stationary blades 33, the base 32 and the lower frame plate 31, and is discharged through the air outlet 60. The outer diameter of the hub 41 of the impeller 40 gradually expands from the air inlet 50 towards the air outlet, so that the airflow AF also gradually expands at the periphery of the impeller 40. In this embodiment, the frame 10 has an outer diameter OD1, the air inlet 50 has an inlet diameter ID1, and the air outlet 60 has an outlet flow channel diameter ID2. The inlet flow channel diameter ID1 is smaller than the outlet flow channel diameter ID2. In this embodiment, the ratio of the inlet channel diameter ID1 to the frame outer diameter OD1 ranges from 0.5 to 0.7. Preferably, the ratio is 0.56. In this embodiment, the ratio of the outlet diameter ID2 to the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio is 0.97.

[0084] Figure 10 It is public Figure 9 Enlarged view of region P2. In this embodiment, the inner wall surface 110 of the upper frame 20 and the outer wall surface 430 and top of the conical cover 43 are generally maintained at a distance G, forming the aforementioned return channel 90. In this embodiment, the distance G / outer diameter OD1 of the frame (see...) Figure 6The ratio of the interval distance G to the outer diameter OD1 of the frame is between 0.01 and 0.02. Preferably, the ratio of the interval distance G to the outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 includes at least an intake section 91, a first horizontal flow section 921, a second horizontal flow section 922, a connecting section 923, and an exhaust section 93. The intake section 91 is adjacent to the bottom end of the conical mask 43 and connects to the exhaust section 93 in sequence through the first horizontal flow section 921, the connecting section 923, and the second horizontal flow section 922. The guide wall 22 at least partially covers the top end of the conical mask 43 to form the exhaust section 93. The return flow BF is opposite in direction to the intake section 91 and the exhaust section 93 and is parallel to the axis C. The direction of the return flow BF in the first horizontal flow section 921 is perpendicular to the axis C, that is, perpendicular to the intake section 91. The direction of the return flow BF in the second horizontal flow section 922 is perpendicular to the axis C, that is, perpendicular to the exhaust section 93. The direction of the return flow BF in the discharge section 93 is the same as the direction of the airflow AF. In this embodiment, the conical mask 43 includes a plurality of balance holes 45, which are arranged around the bottom end of the conical mask 43. The first horizontal flow section 921 is spatially relative to the plurality of balance holes 45, and the flow direction of the return flow BF in the first horizontal flow section 921 is perpendicular to the axial direction C, which can avoid noise generated by the balance holes 45 when the impeller 40a rotates. Because the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical mask 43 are designed to be parallel to each other and generally maintain a distance G to form multiple curved return channels 90, the return channels 90 include at least two vertical bends, so that the return flow BF gradually decreases in velocity and kinetic energy after entering the return channel 90 from the suction section 91. Therefore, the wind resistance between the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical mask 43 can be increased, the return flow entering the return channel 90 can be reduced, and the turbulence intensity of the return channel 90 can be eliminated at the same time.

[0085] Figure 11 This is a structural diagram of the diagonal flow fan according to the third embodiment of the present disclosure. In this embodiment, the diagonal flow fan 1b and... Figures 1 to 3 Similar to the diagonal flow fan 1 shown, and with the same component designations representing the same components, structures, and functions, further details are omitted here. In this embodiment, the diagonal flow fan 1b adopts a flatter design, with the frame 10 formed by assembling an upper frame 20 and a lower frame 30. The accommodating space 100 houses the impeller 40b. In this embodiment, the air inlet 50 and the guide wall 22 are disposed on the upper frame 20. The upper frame 20 includes, for example, a square upper frame plate 21 disposed at the top of the upper frame 20. The air inlet 50 is located on the upper frame 20, is circular, and extends through the upper frame plate 21. The guide wall 22 connects to the upper frame plate 21 and extends downward from the periphery of the air inlet 50 into the accommodating space 100, so as to guide gas into the accommodating space 100 when the impeller 40b rotates. In addition, the top of the hub 41 is flat.

[0086] Figure 12This is a cross-sectional view of a diagonal flow fan according to a third embodiment of the present disclosure. In this embodiment, when the impeller 40b rotates, it forms an airflow AF from the inlet 50 to the outlet 60. The inlet 50 and the outlet 60 are arranged along the axial direction C. The airflow AF is drawn in through the inlet 50, passes through a plurality of blades 44 and between the hub 41 and the conical shroud 43, and then passes through the stationary blades 33, the base 32, and the lower frame plate 31, before being discharged through the outlet 60. The hub 41 of the impeller 40 gradually widens in outer diameter from the inlet 50 towards the outlet, causing the airflow AF to gradually widen around the periphery of the impeller 40. In this embodiment, the frame 10 has an outer diameter OD1, the inlet 50 has an inlet diameter ID1, and the outlet 60 has an outlet flow channel diameter ID2. The inlet flow channel diameter ID1 is smaller than the outlet flow channel diameter ID2. In this embodiment, the ratio of the inlet channel diameter ID1 to the frame outer diameter OD1 ranges from 0.6 to 0.8. Preferably, the ratio is 0.74. In this embodiment, the ratio of the outlet diameter ID2 to the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio is 0.975.

[0087] Figure 13 It is public Figure 12 Enlarged view of region P3. In this embodiment, the inner wall surface 110 of the upper frame 20 and the outer wall surface 430 and top of the conical cover 43 maintain a generally defined distance G, forming the aforementioned return channel 90. In this embodiment, the distance G / outer diameter OD1 of the frame (see...) Figure 6The ratio of the interval distance G to the outer diameter OD1 of the frame is between 0.01 and 0.02. Preferably, the ratio of the interval distance G to the outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 includes at least an intake section 91, a horizontal flow section 92, and an exhaust section 93. The intake section 91 is adjacent to the bottom end of the conical mask 43 and communicates with the exhaust section 93 through the horizontal flow section 92. The guide wall 22 at least partially covers the top end of the conical mask 43 to form the exhaust section 93. The return flow BF is in the opposite direction to the intake section 91 and the exhaust section 93. The direction of the return flow BF in the horizontal flow section 92 is perpendicular to the axial direction C. The direction of the return flow BF in the exhaust section 93 is the same as the direction of the airflow AF. Because the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 are designed to be parallel to each other and generally maintain a distance G to form a return channel 90, the return flow BF gradually decreases in velocity and kinetic energy after entering the return channel 90 from the suction section 91. Therefore, the wind resistance between the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 can be increased, reducing the backflow into the return channel 90 and simultaneously eliminating the turbulence intensity of the return channel 90. In this embodiment, the impeller 40b, for example, omits the aforementioned balance hole 45, and the horizontal flow section 92 is directly relative to the annular plane at the top of the conical shroud 43 in space. On the other hand, the flow direction of the return flow BF in the discharge section 93 of the return channel 90 is the same as the direction of the airflow AF generated when the impeller 40b rotates. When the return flow BF merges with the airflow AF, flow field collision is less likely to occur, effectively reducing noise during operation.

[0088] Figure 14 This is a structural diagram of the diagonal flow fan according to the fourth embodiment of the present disclosure. In this embodiment, the diagonal flow fan 1c and... Figures 11 to 12 Similar to the diagonal flow fan 1b shown, and with the same component designations representing the same components, structures, and functions, further details are omitted here. In this embodiment, the diagonal flow fan 1c also features a flat design, with the frame 10 formed by assembling an upper frame 20 and a lower frame 30. The upper frame 20 is a plate-like structure that covers the side wall of the lower frame 30, forming an accommodating space 100 to house the impeller 40c. In this embodiment, the air inlet 50 and guide wall 22 are located on the upper frame 20. The upper frame 20 is, for example, a square upper frame plate 21 located at the top of the lower frame 30. The air inlet 50 is located on the upper frame 20, is circular, and extends through the upper frame plate 21. The guide wall 22 connects to the upper frame plate 21 and extends downward from the periphery of the air inlet 50 into the accommodating space 100, guiding gas into the accommodating space 100 when the impeller 40c rotates. Similarly, the top of the hub 41 is a flat surface.

[0089] Figure 15This is a cross-sectional view of a diagonal flow fan according to the fourth embodiment of this disclosure. In this embodiment, when the impeller 40c rotates, it forms an airflow AF from the inlet 50 to the outlet 60. The inlet 50 and the outlet 60 are arranged along the axial direction C. The airflow AF is drawn in through the inlet 50, passes through a plurality of blades 44 and between the hub 41 and the conical shroud 43, and then passes through the stationary blades 33, the base 32, and the lower frame plate 31, before being discharged through the outlet 60. The hub 41 of the impeller 40 gradually widens in outer diameter from the inlet 50 towards the outlet, causing the airflow AF to gradually widen around the periphery of the impeller 40. In this embodiment, the frame 10 has an outer diameter OD1, the inlet 50 has an inlet diameter ID1, and the outlet 60 has an outlet flow channel diameter ID2. The inlet flow channel diameter ID1 is smaller than the outlet flow channel diameter ID2. In this embodiment, the ratio of the inlet channel diameter ID1 to the frame outer diameter OD1 ranges from 0.6 to 0.8. Preferably, the ratio is 0.74. In this embodiment, the ratio of the outlet diameter ID2 to the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio is 0.975.

[0090] Figure 16 It is public Figure 15 Enlarged view of region P4. In this embodiment, the inner wall surface 110 of the lower frame 30 and the outer wall surface 430 and top of the conical cover 43 generally maintain a distance G, forming the aforementioned return channel 90. In this embodiment, the distance G / outer diameter OD1 of the frame (see...) Figure 6The ratio of the interval distance G to the outer diameter OD1 of the frame is between 0.01 and 0.02. Preferably, the ratio of the interval distance G to the outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 includes at least an intake section 91, a horizontal flow section 92, and an exhaust section 93, which are perpendicularly connected to each other. The intake section 91 is adjacent to the bottom end of the conical mask 43 and is connected to the exhaust section 93 through the horizontal flow section 92. The guide wall 22 at least partially covers the top end of the conical mask 43 to form the exhaust section 93. In this embodiment, the inner wall surface 110 of the lower frame 30 and the outer wall surface 430 of the conical mask 43 are more, for example, parallel to the axial direction C. The return flow BF is opposite in direction to the intake section 91 and the exhaust section 93. The return flow BF is perpendicular to the axial direction C in the horizontal flow section 92, and also perpendicular to the intake section 91 and the exhaust section 93, respectively. The return flow BF is in the same direction as the airflow AF in the exhaust section 93. Because the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 are designed to be parallel to each other and generally maintain a distance G to form at least two vertically curved return channels 90, the return flow BF gradually decreases in velocity and kinetic energy after entering the return channel 90 from the suction section 91. Therefore, the wind resistance between the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 can be increased, the return flow entering the return channel 90 can be reduced, and the turbulence intensity of the return channel 90 can be eliminated simultaneously. In this embodiment, the conical shroud 43 includes a plurality of balance holes 45, which are arranged around the top of the conical shroud 43. The horizontal flow section 92 is spatially relative to the plurality of balance holes 45 and is perpendicular to and connects between the suction section 91 and the discharge section 93. In other words, the balance holes 45 on the impeller 40c can be set to correspond to the horizontal flow section 92 of the return channel 90 to avoid noise when the impeller 40c rotates. On the other hand, the flow direction of the return flow BF in the discharge section 93 of the return flow channel 90 is the same as the direction of the airflow AF generated when the impeller 40c rotates. When the return flow BF merges with the airflow AF, flow field collisions are less likely to occur, thus reducing operating noise. Of course, the aforementioned technical features of the mixed-flow fan 1c of this disclosure can be combined and varied according to actual application requirements. In addition, the detailed structure of the return flow channel 90 of this disclosure can also be adjusted according to actual applications, and this disclosure is not limited thereto.

[0091] In summary, this disclosure provides an optimized chamber-type diagonal flow fan 1, which can reduce backflow into the chamber and eliminate turbulence zones in the empty chamber, thereby improving fan performance and reducing noise. By interlocking the guide wall 22 on the frame 10 with the top of the impeller 40 conical shroud 43, the inlet flow channel diameter ID1 being smaller than the outlet flow channel diameter ID2, and the top of the conical shroud 43 extending upwards from the tip of the blade 44, the diagonal flow fan 1 achieves characteristics similar to a centrifugal fan in mitigating stall. Because the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 are designed to be parallel to each other and maintain a general interval distance G, a return channel 90 is formed. This allows the return flow BF to gradually reduce its velocity and kinetic energy after entering the return channel 90 from the suction section 91. Therefore, the wind resistance between the inner wall surface 110 of the frame 10 and the outer wall surface 430 and top of the conical shroud 43 can be increased, reducing the backflow into the return channel 90 and simultaneously eliminating the turbulence intensity of the return channel 90. Furthermore, the balance hole 45 on the impeller 40 can be set to correspond to the horizontal flow section 92 of the return channel 90 to avoid noise when the impeller 40 rotates. On the other hand, the flow direction of the return flow BF in the discharge section 93 of the return channel 90 is the same as the direction of the airflow AF generated when the impeller 40 rotates. When the return flow BF merges with the airflow AF, flow field collision is less likely to occur, thus reducing noise during operation.

[0092] This disclosure is open to various modifications by those skilled in the art, but all such modifications shall not depart from the protection sought by the appended claims.

Claims

1. A diagonal-flow fan, comprising: 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 is connected to an inner wall surface of the frame and extends axially from the periphery of the air inlet into the receiving space. An impeller is housed in the receiving space of the frame, and when rotated, it forms an airflow from the air inlet to the air outlet. The impeller includes a conical shroud, and the inner wall of the frame and an outer wall and top of the conical shroud are parallel to each other to maintain a generally equal interval distance, forming a return channel. The impeller includes a hub whose outer diameter gradually expands from the air inlet side to the air outlet, so that the airflow direction around the impeller also gradually expands.

2. The oblique flow fan as claimed in claim 1, wherein the return flow channel includes at least an intake section, a horizontal flow section and an exhaust section, the intake section is adjacent to the bottom end of the conical shroud and communicates with the exhaust section through the horizontal flow section, the guide wall at least partially covers the top end of the conical shroud to form the exhaust section, wherein when the airflow flows from the air inlet to the air outlet, a return flow flows from the intake section through the horizontal flow section and then is discharged from the exhaust section to converge with the airflow.

3. The diagonal flow fan as claimed in claim 2, wherein the conical shroud includes a plurality of balancing holes arranged around the top of the conical shroud, and the advection section is spatially relative to the plurality of balancing holes.

4. The oblique flow fan as claimed in claim 2, wherein the conical shroud includes a plurality of balancing holes arranged around the bottom end of the conical shroud, the horizontal flow section is spatially relative to the plurality of balancing holes, and the return flow channel further includes a second horizontal flow section spatially relative to the top end of the conical shroud.

5. The diagonal flow fan of claim 2, wherein the return flow in the intake section and the exhaust section are in opposite directions.

6. The diagonal flow fan as claimed in claim 2, wherein the direction of the return flow in the horizontal flow section is perpendicular to the axial direction.

7. The diagonal flow fan as claimed in claim 2, wherein the direction of the return flow in the exhaust section is the same as the direction of the airflow.

8. The diagonal flow fan as claimed in claim 1, wherein the impeller includes a hub, a cylindrical portion and a plurality of blades, the cylindrical portion is configured to house a rotor assembly and a stator assembly, the hub is disposed on the cylindrical portion, the plurality of blades are spaced around the hub and are connected between the hub and the conical shroud, wherein the airflow generated when the impeller rotates passes through the plurality of blades and between the hub and the conical shroud.

9. The diagonal flow fan as claimed in claim 8, wherein 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 and the guide wall are disposed on the upper frame.

10. The diagonal flow fan as claimed in claim 9, wherein the upper frame includes an upper frame plate disposed at the top of the upper frame, the air inlet is located on the upper frame, and the guide wall is connected to the upper frame plate and extends downward from the periphery of the air inlet into the accommodating space.

11. The diagonal flow fan of claim 10, wherein the lower frame includes a lower frame plate, a base, and a plurality of stator blades, the lower frame plate is spatially relative to the upper frame plate, the plurality of stator blades are disposed between the base and the lower frame plate, and the structure forms that the air outlet is located between the lower frame plate and the base.

12. The diagonal flow fan of claim 11, wherein the base further includes a shaft tube, the stator assembly includes a winding and a circuit board disposed at the periphery of the shaft tube, the rotor assembly includes a magnetic housing, a magnet and a rotating shaft, the magnetic housing is disposed within the cylindrical portion of the impeller and is configured to accommodate the magnet, the rotating shaft, the winding and a portion of the shaft tube, the magnet is disposed on an inner wall surface of the magnetic housing and is spatially relative to the winding, the rotating shaft is disposed at the center of the magnetic housing and is disposed within the shaft tube via a bearing.

13. The diagonal flow fan of claim 12, wherein a cavity is further formed between the base and the shaft tube, and an electronic component housed on the circuit board is assembled thereon.

14. The oblique flow fan as claimed in claim 1, wherein the air inlet has an air inlet channel diameter, the air outlet has an air outlet channel diameter, and the air inlet channel diameter is smaller than the air outlet channel diameter.

15. The oblique flow fan as claimed in claim 1, wherein the frame has an outer diameter, the air inlet has an air inlet channel diameter, the air outlet has an air outlet channel diameter, the ratio of the air inlet channel diameter to the outer diameter of the frame is between 0.5 and 0.7, and the ratio of the air outlet channel diameter to the outer diameter of the frame is between 0.8 and 0.

98.

16. The oblique flow fan as claimed in claim 1, wherein the frame has an outer diameter, the air inlet has an air inlet channel diameter, the air outlet has an air outlet channel diameter, the ratio of the air inlet channel diameter to the outer diameter of the frame is in the range of 0.6 to 0.8, and the ratio of the air outlet channel diameter to the outer diameter of the frame is in the range of 0.8 to 0.

98.

17. The diagonal flow fan of claim 1, wherein the frame has an outer diameter, and the ratio of the spacing distance to the outer diameter of the frame ranges from 0.01 to 0.

02.

18. The diagonal flow fan of claim 1, wherein the frame, the top of the conical shroud, and the guide wall at least partially overlap in a radial direction.

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