CN115681179A - Diagonal flow fan - Google Patents

Abstract

The present disclosure provides a diagonal flow fan including a frame and an impeller. 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 respectively arranged on two opposite sides of the frame body and are communicated with each other through the accommodating space, and the guide wall axially extends into the accommodating space from the periphery of the air inlet. The impeller is accommodated in the accommodating space of the frame body, and airflow from the air inlet to the air outlet is formed during rotation. The outer diameter of the hub of the impeller from the air inlet side to the air outlet direction is gradually expanded, so that the flow direction of the airflow at the periphery of the impeller is also gradually expanded. The impeller comprises a cone mask, and the inner wall surface of the frame body and the outer wall surface and the top end of the cone mask are basically kept at a spacing distance to form a backflow channel comprising an suction section, an advection section and a discharge section. The suction section is arranged at the bottom end of the conical mask in an adjacent mode and communicated to the discharge section through the advection section, and the guide wall shields the top end of the conical mask to form the discharge section. The reflux flows through the advection section from the suction section and then is discharged from the discharge section to converge to the airflow.

Description

Diagonal flow fan

technical field

The present disclosure relates to a diagonal flow fan, in particular to a chamber optimized diagonal flow fan, so as to reduce backflow into the chamber and eliminate the turbulence area of the empty chamber, thereby achieving the purpose of improving fan characteristics and reducing noise.

Background technique

As the amount of calculation and transmission required by the communication system increases day by day, the performance and power consumption of electronic components in the system need to be continuously improved to cope with the huge data calculation. However, in order for the equipment to operate normally, it is necessary to effectively remove the internal heat of the system. At present, communication equipment on the market still mainly uses fans to perform forced convection on the system to achieve the purpose of heat dissipation. However, under increasingly harsh system conditions, how to effectively improve fan efficiency while maintaining the same noise level has always been the goal of the industry.

In view of this, it is necessary to provide a diagonal flow fan with an optimized chamber, which can reduce the backflow into the chamber and eliminate the turbulent flow area of the empty chamber, so as to improve the characteristics of the fan and reduce the noise, so as to solve the problem of existing Lack of technology.

Contents of the invention

The purpose of the present disclosure is to provide a diagonal flow fan with an optimized chamber, which can reduce the backflow into the chamber and eliminate the turbulence area of the empty chamber, so as to improve the characteristics of the fan and reduce the noise.

Another object of the present disclosure is to provide a diagonal flow fan. The outer diameter of the hub of the impeller gradually expands from the air inlet side to the air outlet, so that the airflow also gradually expands along the periphery of the impeller, thereby forming the main feature of the diagonal flow fan. The guide wall set on the frame is interlaced with the top of the impeller cone cover, the diameter of the flow channel of the air inlet is smaller than the diameter of the flow channel of the air outlet, and the top of the cone cover extends upward from the tip of the blade, so that the oblique flow fan can be achieved as The centrifugal fan slows down the stall zone characteristic. Since the inner wall of the frame and the outer wall and top of the cone mask are designed to be parallel to each other, and a distance is generally maintained to form a return flow channel, so that the return flow gradually reduces the flow velocity and flow field kinetic energy after entering the return flow channel from the suction section, Therefore, the air resistance between the inner wall of the frame body and the outer wall and the top of the cone mask can be increased, the backflow into the backflow channel can be reduced, and the turbulent flow intensity of the backflow channel can be eliminated simultaneously. Furthermore, the balance hole on the impeller can be set corresponding to the advection section of the return channel. On the other hand, the flow direction of the discharge section of the backflow channel is the same as the direction of the airflow generated when the impeller rotates. When the backflow merges into the airflow, the collision of the flow field is less likely to occur and the noise during operation is reduced.

To achieve the aforementioned purpose, the present disclosure provides a diagonal flow fan, including a frame and an impeller. The frame body includes an air inlet, an air outlet, an accommodating space and a guide wall, wherein the air inlet and the air outlet are respectively arranged on two opposite sides of the frame body, and communicate with each other through the accommodating space, and the guide wall 2 is connected to one side of the frame body. The inner wall surface, and the guide wall extends from the periphery of the air inlet along an axial direction into the accommodating space. The impeller is accommodated in the accommodating space of the frame body, and forms an air flow from the air inlet to the air outlet when rotating. The outer diameter of the hub of the impeller gradually expands from the side of the air inlet to the direction of the air outlet, so that the flow direction of the airflow around the periphery of the impeller also gradually expands. The impeller includes a conical cover. A distance is generally maintained between the inner wall of the frame and an outer wall and the top end of the conical cover to form a backflow channel. The backflow channel includes at least a suction section, an advection section and a discharge section. , the suction section is adjacent to the bottom end of the cone mask and is connected to the discharge section through the advection section, and the guide wall at least partially covers the top of the cone mask to form a discharge section, wherein when the air flow flows from the air inlet to the air outlet, a return flow is formed by The suction section flows through the advection section and then is discharged from the discharge section to join the airflow.

Description of drawings

FIG. 1 is an appearance structural view of a diagonal flow fan disclosed in a first embodiment of the present disclosure from a top perspective.

FIG. 2 is an appearance structural view of the oblique flow fan disclosed in the first embodiment of the present disclosure from a bottom perspective.

FIG. 3 is an exploded view of the diagonal flow fan disclosing the first embodiment of the present disclosure.

FIG. 4A is an appearance structural view of the impeller disclosed in the first embodiment of the present disclosure.

4B is a cross-sectional view of the impeller disclosing the first embodiment of the present disclosure.

FIG. 5 is a cross-sectional structure diagram of a diagonal flow fan disclosing the first embodiment of the present disclosure.

FIG. 6 is a cross-sectional view of the diagonal flow fan disclosing the first embodiment of the present disclosure.

FIG. 7 is an enlarged view disclosing the area P1 in FIG. 6 .

Fig. 8A is an appearance structure diagram of an impeller disclosing the second embodiment of the present disclosure.

8B is a cross-sectional view of an impeller disclosing a second embodiment of the present disclosure.

FIG. 9 is a sectional view of a diagonal flow fan disclosing a second embodiment of the present disclosure.

FIG. 10 is an enlarged view disclosing the region P2 in FIG. 9 .

FIG. 11 is an appearance structure diagram of a diagonal flow fan disclosing a third embodiment of the present disclosure.

12 is a sectional view of a diagonal flow fan disclosing a third embodiment of the present disclosure.

FIG. 13 is an enlarged view disclosing a region P3 in FIG. 12 .

Fig. 14 is an appearance structure diagram of a diagonal flow fan disclosing a fourth embodiment of the present disclosure.

15 is a sectional view of a diagonal flow fan disclosing a fourth embodiment of the present disclosure.

FIG. 16 is an enlarged view disclosing the region P4 in FIG. 15 .

Explanation of reference signs:

1, 1a, 1b, 1c: Diagonal flow fans

10: frame

100: storage space

110: Inner wall surface

20: Upper frame

21: Upper frame plate

22: guide wall

30: lower frame

31: lower frame plate

32: Base

33: static leaves

34: shaft tube

35: outer wall

36: Cavity

40, 40a, 40b, 40c: impeller

41: hub

42: Cylindrical part

43: Cone Mask

430: Outer wall

44: blade

45: balance hole

50: air inlet

60: air outlet

70: Magnetic Shell

71: magnet

72: Shaft

73: Bearing

80: winding

81: circuit board

82: Electronic components

90: return channel

91: suction section

92: Advection section

921: The first advection section

922: Second advection section

923: Connected segment

93: discharge section

AF: Airflow

BF: Backflow

C: Axial

G: Gap distance

ID1: Diameter of air inlet channel

ID2: Diameter of air outlet flow channel

OD1: frame outer diameter

P1, P2, P3, P4: Zones

X, Y, Z: axis

Detailed ways

Some typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the description in the following paragraphs. It should be understood that the disclosure is capable of various changes in different embodiments without departing from the scope of the disclosure, and that the description and drawings therein are illustrative in nature and not limiting. This disclosure. For example, if the following content of the present disclosure describes that a first feature is disposed on or above a second feature, it means that it includes an embodiment in which the above-mentioned first feature and the above-mentioned second feature are in direct contact, Embodiments in which additional features may be disposed between the above-mentioned first feature and the above-mentioned second feature, so that the above-mentioned first feature and the above-mentioned second feature may not be in direct contact are also included. In addition, different embodiments in the present disclosure may use repeated reference symbols and/or labels. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the relationship between various embodiments and/or the described appearance structures. Furthermore, in order to facilitate the description of the relationship between a component or feature part and another (plural) component or (plurality) feature part in the drawings, spatial relative terms may be used, such as "below", "under", "Lower", "Above", "Upper" and similar expressions. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise positioned (eg, rotated 90 degrees or at other orientations) and the description of the spatially relative terminology used be interpreted accordingly. Also, when a component is referred to as being "connected" or "coupled" to another component, it can be directly connected or coupled to the other component or intervening components may be present. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. In addition, it can be 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. These components correspondingly described in the embodiments are represented by different component symbols. These terms are used to distinguish between different components. For example, a first component may be called a second component, and similarly, a second component may also be called a first component without departing from the scope of the embodiments.

FIG. 1 is an appearance structural view of a diagonal flow fan disclosed in a first embodiment of the present disclosure from a top perspective. In this embodiment, the diagonal flow fan 1 mainly includes a frame 10 and an impeller 40 . The frame body 10 includes an upper frame body (upper frame) 20 and a lower frame body (lower frame) 30 , which are assembled with each other to form an accommodating space 100 for accommodating the impeller 40 . In this embodiment, an air inlet 50 and a guiding wall 22 are disposed on the upper frame 20 . The guide wall 22 extends downward from the periphery of the air inlet 50 along an axis C into the accommodating space 100 . A hub 41 of the impeller 40 is exposed through the air inlet 50 . In this embodiment, the upper frame body 20 includes, for example, a square upper frame body plate (upperframe plate) 21 disposed on the top of the upper frame body 20, and the air inlet 50 is located on the upper frame body 20, which is circular and runs through the upper frame body plate twenty one. The guide wall 22 is an annular curved surface and is connected to the upper frame plate 21 , extending downward from the periphery of the air inlet 50 into the accommodating space 100 , so as to introduce gas into the accommodating space 100 when the impeller 40 rotates.

FIG. 2 is an appearance structural view of the oblique flow fan disclosed in the first embodiment of the present disclosure from a bottom 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 relative to the upper frame plate 21 , and the two are substantially parallel to each other. A plurality of vanes 33 are arranged between the base 32 and the lower frame plate 31, and the two ends of each vane 33 are respectively connected between the base 32 and the lower frame plate 31 to form an air outlet (outlet) 60, The air outlet 60 is located between the lower frame plate 31 and the base 32 . When the impeller 40 rotates, the gas in the accommodating space 100 will pass between the vanes 33 , the base 32 and the lower frame plate 31 , and be discharged from the air outlet 60 .

FIG. 3 is an exploded view of the diagonal flow fan disclosing the first embodiment of the present disclosure. In this embodiment, the frame body 10 is assembled from an upper frame body 20 and a lower frame body 30 . The upper frame 20 , the impeller 40 and the lower frame 30 are arranged along the axial direction C, so that the impeller 40 is put into the accommodating space 100 when the upper frame 20 and the 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 . A plurality of blades 44 of the impeller 40 are connected between the hub 41 and the cone 43 . A plurality of balance holes 45 are disposed on the top plane of the cone cover 43 . The number, shape and size of the plurality of balance holes 45 can be adjusted according to actual application requirements, and the present disclosure is not limited thereto.

FIG. 4A is an appearance structural view of the impeller disclosed in the first embodiment of the present disclosure. In this embodiment, the hub 41 , the cylindrical portion 42 , the conical cover 43 , the blades 44 and the balance holes 45 are integrally formed as a single component. The bottom end of the hub 41 extends axially to form a cylindrical portion 42 . The conical cover 43 and the hub 41 are arranged concentrically with each other, and the conical cover 43 is connected to the periphery of the hub 41 through a 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 ring wall of the cone 43 . The cylindrical portion 42 drives the hub 41 , the plurality of blades 44 and the conical cover 43 to rotate, and drives air to pass between the hub 41 , the plurality of blades 44 and the conical cover 43 .

4B is a cross-sectional view of the impeller disclosing 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 tops of the cones 43 extend upwards from the tips of the blades 44, so that the tops of the cones 43 are higher than the top of the hub 41 in the axial direction C and A plurality of vanes 44 are connected to the tip of the cone 43 . The top of the hub 41 is lower than the top of the cone 43 . The outer diameter of the hub 41 of the impeller 40 gradually expands from the side of the air inlet 50 to the direction of the air outlet.

FIG. 5 is a cross-sectional structure diagram of a diagonal flow fan disclosing 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 , and the winding 80 and the printed circuit board 81 are both disposed on the periphery of the shaft tube 34 . The rotor assembly includes a magnetic shell 70 , a magnet 71 and a shaft 72 . The magnetic shell 70 is disposed in the hollow of the cylindrical portion 42 of the impeller 40 and connected to the shaft 72 . In this embodiment, the magnet 71 is disposed on the radially inner wall surface of the magnetic permeable shell 70 , spatially opposite to the winding 80 . The rotating shaft 72 is disposed at the center of the magnetically permeable shell 70 , and the rotating shaft 72 is disposed in the shaft tube 34 through 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, and the top of the cone face cover 43 extends upward from the outer end of the blade 44. The upper frame body 20 of the frame body 10, the cone face cover 43 and the guide wall 22 overlap at least partially in the radial direction. The integrally formed upper frame body 20 and the guide wall 22 are substantially parallel to the air inlet side of the cone face cover 43, so that a gap is formed between the upper frame body 20 of the frame body 10, the outside of the cone face cover 43 and the inside of the guide wall 22. Backflow channel 90 . The return channel 90 is in a multi-segment curved shape, which can change the flow direction.

FIG. 6 is a cross-sectional view of the diagonal flow fan disclosing the first embodiment of the present disclosure. In this embodiment, the rotor assembly and the stator assembly are accommodated between the impeller 40 and the lower frame body 30, and a cavity (chamber) 36 is formed between the outer wall (base wall) 35 of the base 32 and the shaft tube 34, An electronic component 82 accommodated on the circuit board 81 is assembled. The top end of the base 32 corresponds to the periphery of the cylindrical portion 42 . In this embodiment, the airflow AF from the air inlet 50 to the air outlet 60 is formed when the impeller 40 rotates. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is inhaled by the air inlet 50, passes through a plurality of blades 44 and between the hub 41 and the cone cover 43, and then passes through the vane 33, the base 32 and the lower frame plate 31, it is discharged from the air outlet 60. Since the outer diameter of the hub 41 of the impeller 40 gradually expands from the side of the air inlet 50 toward the air outlet, the airflow AF also gradually expands along the periphery of the impeller 40 . In this embodiment, the frame body 10 has a frame outer diameter OD1, the air inlet 50 has an air inlet diameter ID1, and the air outlet 60 has an air outlet flow channel diameter ID2. The diameter ID1 of the flow channel of the air inlet is smaller than the diameter ID2 of the flow channel of the air outlet. In this embodiment, the ratio of the diameter ID1 of the air inlet channel/the outer diameter OD1 of the frame ranges from 0.5 to 0.7. Preferably, the ratio of the air inlet channel diameter ID1/the frame outer diameter OD1 is 0.56. In this embodiment, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 is 0.97. The diameter ID1 of the flow path of the air inlet is smaller than the diameter ID2 of the flow path of the air outlet, and the top of the conical cover 43 extends upward from the tips of the blades 44 .

FIG. 7 is an enlarged view disclosing the area P1 in FIG. 6 . In this embodiment, a distance G is generally maintained between the inner wall 110 of the upper frame 20 and the outer wall 430 and the top end of the cone cover 43 to form the return channel 90 . In this embodiment, the ratio of the distance G/outer diameter OD1 of the frame (see FIG. 6 ) ranges from 0.01 to 0.02. Preferably, the ratio of the interval distance G/outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 at least includes an intake section 91 , a horizontal section 92 and an exhaust section 93 . The suction section 91 is located at the bottom of the cone mask 43 and communicates with the discharge section 93 through the advection section 92 , and the guide wall 22 at least partially covers the top of the cone mask 43 to form the discharge section 93 . The direction of the backflow BF is opposite to that of the suction section 91 and the discharge section 93 . The direction of the return flow BF in the advection section 92 is perpendicular to the axis C. The direction of the backflow BF in the discharge section 93 is the same as that of the airflow AF. Since the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top end of the cone face cover 43 are designed to be parallel to each other, and a distance G is generally maintained to form a multi-section curved return channel 90, the return flow BF is drawn from the suction section 91 After entering the backflow channel 90, the flow velocity and flow field kinetic energy are gradually reduced, so the wind resistance between the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top of the cone face cover 43 can be increased, the backflow entering the backflow channel 90 can be reduced, and the backflow channel can be simultaneously eliminated. Turbulence intensity of 90. 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 advection section 92 is spatially opposite to the plurality of balance holes 45 . In this embodiment, the corresponding lengths of the suction section 91 , the advection section 92 and the discharge section 93 can be varied and curved by adjusting the frame body 10 , the impeller 40 and the guide wall 22 . In other embodiments, the corresponding lengths and relative bending angles of the suction section 91 , the advection section 92 , and the discharge section 93 can also be adjusted according to actual application requirements, and the disclosure is not limited thereto.

Fig. 8A is an appearance structure diagram of an impeller disclosing the second embodiment of the present disclosure. In this embodiment, the impeller 40 a includes a hub 41 , a cylindrical portion 42 , a conical cover 43 , a plurality of blades 44 and a plurality of balance holes 45 . The bottom end of the hub 41 is connected to the cylindrical portion 42 and the two are integrally formed. The cone cover 43 and the hub 41 are arranged concentrically with each other, and the cone cover 43 is connected to the outside of the hub 41 through a plurality of blades 44 . In this embodiment, the plurality of blades 44 are three-dimensionally curved. The inner end of each vane 44 is connected to the hub 41 , and the outer end of each vane is connected to the inner wall of the cone 43 , so as to connect the opening above the cone 43 to the periphery of the cylindrical portion 42 . The cylindrical part 42 drives the hub 41 , the plurality of blades 44 and the conical cover 43 to rotate, and drives air to pass between the hub 41 , the plurality of blades 44 and the conical cover 43 . In this embodiment, the bottom end of the cone face cover 43 protrudes radially outwards to form an annular plane, and a plurality of balance holes 45 are ring-shaped at the bottom end of the cone face cover 43, located at the bottom end protruding outwards. On the annular plane, and the opening of each balance hole 45 faces upward.

8B is a cross-sectional view of an impeller disclosing a 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 cover 43 further extends upward from the tips of the blades 44 . The top of the cone 43 forms a smooth annular plane, which is higher than the tip of the plurality of blades 44 connecting the cone 43 and also higher than the top of the hub 41 . In this embodiment, the cylindrical portion 42 is, for example, ring-shaped and has a hollow portion, and is configured 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. Cooperating with the design change of the balance hole 45, the application change of the impeller 40a is further increased.

FIG. 9 is a sectional view of a diagonal flow fan disclosing a second embodiment of the present disclosure. In this embodiment, the airflow AF from the air inlet 50 to the air outlet 60 is formed when the impeller 40 a rotates. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is inhaled by the air inlet 50, passes through a plurality of blades 44 and between the hub 41 and the cone cover 43, and then passes through the vane 33, the base 32 and the lower frame plate 31, it is discharged from the air outlet 60. The outer diameter of the hub 41 of the impeller 40 gradually expands from the side of the air inlet 50 toward the air outlet, so that the airflow AF also gradually expands along the periphery of the impeller 40 . In this embodiment, the frame body 10 has a frame outer diameter OD1, the air inlet 50 has an air inlet diameter ID1, and the air outlet 60 has an air outlet flow channel diameter ID2. The diameter ID1 of the flow channel of the air inlet is smaller than the diameter ID2 of the flow channel of the air outlet. In this embodiment, the ratio of the diameter ID1 of the air inlet channel/the outer diameter OD1 of the frame ranges from 0.5 to 0.7. Preferably, the ratio of the air inlet channel diameter ID1/the frame outer diameter OD1 is 0.56. In this embodiment, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 is 0.97.

FIG. 10 is an enlarged view disclosing the region P2 in FIG. 9 . In this embodiment, a distance G is generally maintained between the inner wall surface 110 of the upper frame body 20 and the outer wall surface 430 and the top end of the conical surface cover 43 to form the aforementioned return channel 90 . In this embodiment, the ratio of the distance G/outer diameter OD1 of the frame (see FIG. 6 ) ranges from 0.01 to 0.02. Preferably, the ratio of the interval distance G/outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 at least includes a suction section 91 , a first advection section 921 , a second advection section 922 , a communication section 923 and a discharge section 93 . The suction section 91 is adjacent to the bottom end of the cone mask 43 and is connected to the discharge section 93 through the first advection section 921, the communication section 923 and the second advection section 922 in sequence, and the guide wall 22 at least partially covers the top of the cone mask 43 and This discharge section 93 is formed. The direction of the backflow BF is opposite to that of the suction section 91 and the discharge section 93 , and is parallel to the axis C. The direction of the return flow BF in the first advection section 921 is perpendicular to the axis C, that is, perpendicular to the suction section 91 . The direction of the return flow BF in the second advection section 922 is perpendicular to the axis C, that is, perpendicular to the discharge section 93 . The direction of the backflow BF in the discharge section 93 is the same as that of the airflow AF. In this embodiment, the cone face cover 43 includes a plurality of balance holes 45, which are arranged around the bottom end of the cone face cover 43, the first advection section 921 is spatially opposite to the plurality of balance holes 45, and the return flow BF is in the first advection section The flow direction of 921 is perpendicular to the axis C, which can prevent the balance hole 45 from generating noise when the impeller 40a rotates. Since the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top of the cone face cover 43 are designed to be parallel to each other, and a distance G is generally maintained to form a multi-section curved return channel 90, the return channel 90 includes at least two vertical bends. The backflow BF gradually reduces the flow velocity and flow field kinetic energy after entering the backflow channel 90 from the suction section 91, so the wind resistance between the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top end of the cone face cover 43 can be improved, and the inflow can be reduced. The backflow of the return channel 90 simultaneously eliminates the turbulence intensity of the return channel 90 .

FIG. 11 is an appearance structure diagram of a diagonal flow fan disclosing a third embodiment of the present disclosure. In this embodiment, the oblique flow fan 1 b is similar to the oblique flow fan 1 shown in FIGS. 1 to 3 , and the same component numbers represent the same components, structures and functions, which will not be repeated here. In this embodiment, the oblique flow fan 1 b is more flat design, and the frame body 10 is formed by assembling the upper frame body 20 and the lower frame body 30 . The accommodating space 100 is configured to accommodate the impeller 40b. In this embodiment, the air inlet 50 and the guide wall 22 are disposed on the upper frame body 20 . The upper frame body 20 includes, for example, a square upper frame body plate 21 disposed on the top of the upper frame body 20 , and the air inlet 50 is located on the upper frame body 20 and is circular and penetrates through the upper frame body plate 21 . The guide wall 22 is connected to the upper frame plate 21 and extends downward from the periphery of the air inlet 50 into the accommodating space 100 to guide the air into the accommodating space 100 when the impeller 40b rotates. In addition, the top end of the hub 41 is a plane.

12 is a sectional view of a diagonal flow fan disclosing a third embodiment of the present disclosure. In this embodiment, the airflow AF from the air inlet 50 to the air outlet 60 is formed when the impeller 40b rotates. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is inhaled by the air inlet 50, passes through a plurality of blades 44 and between the hub 41 and the cone cover 43, and then passes through the vane 33, the base 32 and the lower frame plate 31, it is discharged from the air outlet 60. The outer diameter of the hub 41 of the impeller 40 gradually expands from the side of the air inlet 50 toward the air outlet, so that the airflow AF also gradually expands along the periphery of the impeller 40 . In this embodiment, the frame body 10 has a frame outer diameter OD1, the air inlet 50 has an air inlet diameter ID1, and the air outlet 60 has an air outlet flow channel diameter ID2. The diameter ID1 of the flow channel of the air inlet is smaller than the diameter ID2 of the flow channel of the air outlet. In this embodiment, the ratio of the air inlet channel diameter ID1/the frame outer diameter OD1 ranges from 0.6 to 0.8. Preferably, the ratio of the diameter ID1 of the flow channel of the air inlet/the outer diameter OD1 of the frame is 0.74. In this embodiment, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 is 0.975.

FIG. 13 is an enlarged view disclosing a region P3 in FIG. 12 . In this embodiment, a distance G is generally maintained between the inner wall surface 110 of the upper frame body 20 and the outer wall surface 430 and the top end of the conical surface cover 43 to form the aforementioned return channel 90 . In this embodiment, the ratio of the distance G/outer diameter OD1 of the frame (see FIG. 6 ) ranges from 0.01 to 0.02. Preferably, the ratio of the interval distance G/outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 at least includes a suction section 91 , a flattening section 92 and a discharge section 93 . The suction section 91 is adjacent to the bottom of the cone 43 and communicates with the discharge section 93 through the advection section 92 . The guide wall 22 at least partially covers the top of the cone 43 to form the discharge section 93 . The direction of the backflow BF is opposite to that of the suction section 91 and the discharge section 93 . The direction of the return flow BF in the advection section 92 is perpendicular to the axis C. The direction of the backflow BF in the discharge section 93 is the same as that of the airflow AF. Since the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top end of the conical face cover 43 are designed to be parallel to each other, and a distance G is generally maintained to form the return flow channel 90, the return flow BF enters the return flow channel 90 from the suction section 91 Then gradually reduce the flow velocity and the kinetic energy of the flow field, so the wind resistance between the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top of the cone face cover 43 can be improved, the backflow entering the backflow channel 90 can be reduced, and the turbulent flow in the backflow channel 90 can be eliminated simultaneously. strength. In this embodiment, for example, the impeller 40b omits the setting of the aforementioned balance hole 45 , and the advection section 92 is directly opposite to the annular plane at the top of the conical surface cover 43 in space. On the other hand, the flow direction of the backflow BF in the discharge section 93 of the backflow channel 90 is the same as the direction of the airflow AF generated when the impeller 40b rotates. noise.

Fig. 14 is an appearance structure diagram of a diagonal flow fan disclosing a fourth embodiment of the present disclosure. In this embodiment, the oblique flow fan 1 c is similar to the oblique flow fan 1 b shown in FIGS. 11 to 12 , and the same component numbers represent the same components, structures and functions, which will not be repeated here. In this embodiment, the diagonal flow fan 1 c is also designed in a flat form, and the frame body 10 is formed by assembling the upper frame body 20 and the lower frame body 30 . Wherein the upper frame body 20 has a plate-like structure and covers the side wall of the lower frame body 30 to form an accommodating space 100 for accommodating the impeller 40c. In this embodiment, the air inlet 50 and the guide wall 22 are disposed on the upper frame body 20 . The upper frame 20 is, for example, a square upper frame plate 21 disposed on the top of the lower frame 30 , and the air inlet 50 is located on the upper frame 20 and is circular and penetrates through 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 50 into the accommodating space 100 , so as to guide the air into the accommodating space 100 when the impeller 40c rotates. Likewise, the top end of the hub 41 is a plane.

15 is a sectional view of a diagonal flow fan disclosing a fourth embodiment of the present disclosure. In this embodiment, the airflow AF from the air inlet 50 to the air outlet 60 is formed when the impeller 40c rotates. The air inlet 50 and the air outlet 60 are arranged along the axial direction C. The airflow AF is inhaled by the air inlet 50, passes through a plurality of blades 44 and between the hub 41 and the cone cover 43, and then passes through the vane 33, the base 32 and the lower frame plate 31, it is discharged from the air outlet 60. The outer diameter of the hub 41 of the impeller 40 gradually expands from the side of the air inlet 50 toward the air outlet, so that the airflow AF also gradually expands along the periphery of the impeller 40 . In this embodiment, the frame body 10 has a frame outer diameter OD1, the air inlet 50 has an air inlet diameter ID1, and the air outlet 60 has an air outlet flow channel diameter ID2. The diameter ID1 of the flow channel of the air inlet is smaller than the diameter ID2 of the flow channel of the air outlet. In this embodiment, the ratio of the air inlet channel diameter ID1/the frame outer diameter OD1 ranges from 0.6 to 0.8. Preferably, the ratio of the diameter ID1 of the flow channel of the air inlet/the outer diameter OD1 of the frame is 0.74. In this embodiment, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 ranges from 0.8 to 0.98. Preferably, the ratio of the air outlet diameter ID2/the frame outer diameter OD1 is 0.975.

FIG. 16 is an enlarged view disclosing the region P4 in FIG. 15 . In this embodiment, a distance G is generally maintained between the inner wall surface 110 of the lower frame 30 and the outer wall surface 430 and the top end of the conical cover 43 to form the return channel 90 . In this embodiment, the ratio of the distance G/outer diameter OD1 of the frame (see FIG. 6 ) ranges from 0.01 to 0.02. Preferably, the ratio of the interval distance G/outer diameter OD1 of the frame is 0.0125. In this embodiment, the return channel 90 at least includes a suction section 91 , a flat flow section 92 and a discharge section 93 , which are vertically communicated with each other. The suction section 91 is adjacent to the bottom of the cone 43 and communicates with the discharge section 93 through the advection section 92 . The guide wall 22 at least partially covers the top of the cone 43 to form the discharge section 93 . In this embodiment, the inner wall surface 110 of the lower frame body 30 and the outer wall surface 430 of the conical cover 43 are, for example, parallel to the axis C. The direction of the backflow BF is opposite to that of the suction section 91 and the discharge section 93 . The direction of the return flow BF in the advection section 92 is perpendicular to the axial direction C, and is also perpendicular to the suction section 91 and the discharge section 93 respectively. The direction of the backflow BF in the discharge section 93 is the same as that of the airflow AF. Since the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top end of the cone face cover 43 are designed to be parallel to each other, and a distance G is generally maintained to form at least two sections of vertically curved return flow passages 90, the return flow BF is drawn by the suction After the section 91 enters the backflow channel 90, the flow velocity and the kinetic energy of the flow field are gradually reduced, so the wind resistance between the inner wall surface 110 of the frame body 10, the outer wall surface 430 and the top of the cone face cover 43 can be improved, the backflow entering the backflow channel 90 can be reduced, and the flow field can be eliminated simultaneously. The intensity of the turbulence in the return channel 90 . 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. The advection section 92 is spatially opposite to the plurality of balance holes 45, and is vertical and communicated with the suction section 91 and the discharge section. Between 93. In other words, the balance hole 45 on the impeller 40c can be disposed corresponding to the advection section 92 of the return channel 90 to avoid noise generated when the impeller 40c rotates. On the other hand, the flow direction of the backflow BF in the discharge section 93 of the backflow channel 90 is the same as the direction of the airflow AF generated when the impeller 40c rotates. When the backflow BF merges into the airflow AF, it is difficult to cause flow field collision and reduce the operating efficiency. noise. Certainly, the mixed-flow fan 1c of the present disclosure may combine and change many of the aforementioned technical features according to actual application requirements. In addition, the detailed structure of the return channel 90 in the present disclosure can also be adjusted according to the actual application, and the present disclosure is not limited thereto.

To sum up, the present disclosure provides a chamber-optimized diagonal flow fan 1 , which can reduce backflow into the chamber and eliminate the turbulence area of the empty chamber, so as to improve fan characteristics and reduce noise. The guide wall 22 provided on the frame 10 and the top of the impeller 40 conical cover 43 are staggered and inserted, the air inlet channel diameter ID1 is smaller than the air outlet channel diameter ID2, and the top of the conical cover 43 extends upward from the tip of the blade 44 , so that the diagonal flow fan 1 can achieve the characteristics of slowing down the stall zone like a centrifugal fan. Since the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top end of the cone face cover 43 are designed to be parallel to each other, and a distance G is generally maintained, a return flow channel 90 is formed, so that the return flow BF enters the return flow channel 90 from the suction section 91 Then gradually reduce the flow velocity and the kinetic energy of the flow field, so the wind resistance between the inner wall surface 110 of the frame body 10 and the outer wall surface 430 and the top of the cone face cover 43 can be improved, the backflow entering the backflow channel 90 can be reduced, and the turbulent flow in the backflow channel 90 can be eliminated simultaneously. strength. Furthermore, the balance hole 45 on the impeller 40 can be disposed corresponding to the advection section 92 of the return channel 90 to avoid noise generated when the impeller 40 rotates. On the other hand, the flow direction of the backflow BF in the discharge section 93 of the backflow channel 90 is the same as the direction of the airflow AF generated when the impeller 40 rotates. When the backflow BF merges into the airflow AF, it is difficult for the flow field to collide and reduce the operating efficiency. noise.

The present disclosure can be modified in various ways by those skilled in the art without departing from what is intended to be protected by the appended claims.

Claims (18)

1. A diagonal flow fan comprising:

the air inlet and the air outlet are respectively arranged on two opposite sides of the frame body and are communicated with each other through the accommodating space, the guide wall is connected with an inner wall surface of the frame body, and the guide wall extends into the accommodating space from the periphery of the air inlet along an axial direction; and

an impeller accommodated in the accommodating space of the frame body and forming an air flow from the air inlet to the air outlet when rotating, wherein the impeller comprises a conical mask, and a spacing distance is substantially maintained between the inner wall surface of the frame body and an outer wall surface and the top end of the conical mask to form a return channel; the impeller comprises a hub, the outer diameter of the hub is gradually expanded from the air inlet side to the air outlet direction, so that the flow direction of the airflow is also gradually expanded at the periphery of the impeller.

2. The diagonal flow fan of claim 1, wherein the backflow channel comprises an intake section, a flat flow section and an exhaust section, the intake section is disposed adjacent to the bottom end of the conical mask and is communicated to the exhaust section through the flat flow section, the guide wall at least partially shields the top end of the conical mask to form the exhaust section, wherein when the airflow flows from the air inlet to the air outlet, a backflow flows from the intake section through the flat flow section and then is exhausted from the exhaust section to converge on the airflow.

3. The diagonal flow fan of claim 2, wherein the cone cover includes a plurality of balance holes disposed around a top end of the cone cover, the advection section being spatially opposite to the plurality of balance holes.

4. The diagonal flow fan of claim 2, wherein the cone housing includes a plurality of balance holes disposed around a bottom end of the cone housing, the advection section spatially opposing the plurality of balance holes, the return channel further including a second advection section spatially opposing a top end of the cone housing.

5. The diagonal flow fan of claim 2, wherein the directions of the backflow to the suction section and the discharge section are opposite.

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

7. The diagonal flow fan of claim 2, wherein the direction of the backflow in the discharge section is the same as the direction of the airflow.

8. The diagonal flow fan of claim 1, wherein the impeller includes a hub, a cylindrical portion, and a plurality of blades, the cylindrical portion configured to house a rotor assembly and a stator assembly, the hub disposed on the cylindrical portion, the plurality of blades spaced around the hub, and the plurality of blades connected between the hub and the cone cover, wherein the airflow generated by rotation of the impeller passes through the plurality of blades and between the hub and the cone cover.

9. The diagonal flow fan of claim 8, wherein the frame comprises an upper frame and a lower frame assembled to form the air inlet, the air outlet and the receiving space, wherein the air inlet and the guiding wall are disposed on the upper frame.

10. The diagonal flow fan as claimed in claim 9, wherein the upper frame comprises an upper frame plate disposed at a top end of the upper frame, the air inlet is disposed in the upper frame, and the guiding wall is connected to the upper frame plate and extends downward from a periphery of the air inlet to the accommodating space.

11. The diagonal flow fan of claim 10, wherein the lower frame includes a lower frame plate spatially opposite the upper frame plate, a base, and a plurality of vanes disposed between the base and the lower frame plate configured to form the outlet between the lower frame plate and the base.

12. The diagonal flow fan according to claim 11, wherein the base further comprises a shaft tube, the stator assembly comprises a winding and a circuit board disposed at a periphery of the shaft tube, the rotor assembly comprises a magnetic conductive shell, a magnet and a rotating shaft, the magnetic conductive shell is disposed in the cylindrical portion of the impeller and is configured to receive 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 conductive shell and spatially faces the winding, the rotating shaft is disposed at a center of the magnetic conductive shell, and the rotating shaft is disposed in the shaft tube through a bearing.

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

14. The diagonal flow fan of claim 1, wherein the air inlet has an inlet flow channel diameter and the air outlet has an outlet flow channel diameter, the inlet flow channel diameter being smaller than the outlet flow channel diameter.

15. The diagonal flow fan of claim 1, wherein the frame has an outer frame diameter, the air inlet has an air inlet diameter, the air outlet has an air outlet channel diameter, a ratio of the air inlet channel diameter to the outer frame diameter ranges from 0.5 to 0.7, and a ratio of the air outlet diameter to the outer frame diameter ranges from 0.8 to 0.98.

16. The diagonal flow fan of claim 1, wherein the frame has an outer frame diameter, the air inlet has an air inlet diameter, the air outlet has an air outlet channel diameter, a ratio of the air inlet channel diameter to the outer frame diameter ranges from 0.6 to 0.8, and a ratio of the air outlet diameter to the outer frame diameter ranges from 0.8 to 0.98.

17. The diagonal flow fan of claim 1, wherein the frame has a frame outer diameter, wherein a ratio of the separation distance/the frame outer diameter ranges from 0.01 to 0.02.

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

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