An EC axial flow fan

Abstract

The utility model discloses an EC axial flow fan, including a shell, a stator assembly and a rotor assembly, wherein the shell is formed with a hollow cavity, an air inlet and an air outlet connected to the hollow cavity and the outside, the air inlet and the air outlet are arranged in front and back correspondence, the stator assembly is fixedly assembled in the cavity, the rotor assembly is rotatably assembled in the cavity, and is electromagnetically coupled with the stator assembly, the air inlet and the air outlet are both trumpet-shaped, the axial depth of the trumpet-shaped air inlet is greater than the axial depth of the trumpet-shaped air outlet, and the side wall of the hollow cavity between the air inlet and the air outlet is a straight wall. When the rotor assembly rotates, a low pressure area is formed in the hollow cavity, and since the air inlet and the air outlet are designed in a trumpet shape, compared with the straight-walled air outlet, the trumpet-shaped air outlet can inhale a wider range of airflow and expand the heat dissipation range to improve the heat dissipation efficiency of the heat dissipation fan.

Description

Technical Field

[0001] The utility model relates to the field of electronic and electrical products, in particular to a radiator. Background Art

[0002] The cooling fan mainly includes a shell, a stator assembly and a rotor assembly (fan wheel assembly). The shell is formed with a hollow cavity, an air inlet and an air outlet connecting the hollow cavity and the outside. The stator assembly is fixedly assembled in the cavity. The rotor assembly is rotatably assembled in the cavity and is electromagnetically coupled with the stator assembly. The winding of the stator assembly needs to be energized to generate electromagnetic force to drive the rotor assembly to rotate. The stator assembly is located at the center of the cooling fan, and an air flow channel is provided around it. The wires connected to the stator assembly need to be led to the periphery of the cooling fan through the air flow channel and connected to the power supply components. Utility Model Content

[0003] The technical problem solved by the utility model is to improve the heat dissipation efficiency of a heat dissipation fan.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an EC axial flow fan, comprising a shell, a stator assembly and a rotor assembly, the shell forming a hollow cavity, an air inlet and an air outlet connecting the hollow cavity and the outside, the air inlet and the air outlet are arranged in front and back correspondence, a stator assembly mounting plate is provided at the center of the air inlet, the stator assembly mounting plate is connected to the shell through a plurality of ribs, the stator assembly is fixedly assembled on the stator assembly mounting plate and is located in the cavity, the rotor assembly is rotatably assembled in the cavity and is electromagnetically coupled with the stator assembly, the air inlet and the air outlet are both trumpet-shaped, the axial depth of the trumpet-shaped air inlet is greater than the axial depth of the trumpet-shaped air outlet, and the side wall of the hollow cavity between the air inlet and the air outlet is a straight wall.

[0005] The rotor assembly rotates, and a low-pressure area is formed in the hollow cavity. The airflow outside the air inlet flows into the hollow cavity through the air inlet. Since the air inlet is designed in a trumpet shape, compared with the straight-walled air inlet, the trumpet-shaped air inlet can inhale a wider range of airflow to improve the heat dissipation efficiency of the cooling fan.

[0006] The air outlet is in the shape of a trumpet. Under the action of the rotor assembly, the airflow in the hollow cavity can be discharged quickly. Compared with the straight-walled air outlet, the airflow discharge range is expanded, which is beneficial to improving the heat dissipation efficiency of the cooling fan.

[0007] The axial depth of the trumpet-shaped air inlet is greater than the axial depth of the trumpet-shaped air outlet. In this way, under the action of the rotor assembly, a low-pressure area as large as possible is formed in the hollow cavity, and a large amount of airflow on one side of the air inlet is sucked in to improve the heat dissipation efficiency of the cooling fan. The trumpet-shaped air inlet is equivalent to chamfering the end edge of the hollow cavity. The chamfer includes two right-angled sides, and the length of the axial right-angled side represents the axial depth of the air inlet.

[0008] A wire limiting groove is provided on one of the plurality of ribs, the inner end of the wire limiting groove extends to the stator assembly mounting plate, and is connected to the wire hole on the stator assembly mounting plate, and the outer end of the wire limiting groove extends to the edge of the shell to form a first notch, and the opening end of the first notch is provided with a first blocking structure. The wire connected to the stator assembly is led out from the wire hole, enters the wire limiting groove, passes through the air inlet, and is led out from the first notch. Since the wire limiting groove is directly provided on the rib, the wire embedded in the wire limiting groove will not enter the air inlet of the axial flow fan and interfere with the rotor assembly. The first blocking structure can prevent the wire in the first notch from running out.

[0009] The wire limiting groove includes a main limiting groove with an opening facing upward and a reverse locking limiting groove with an opening facing downward. A triangular opening is provided at the junction of the reverse locking limiting groove and the main limiting groove. The wire connected to the stator assembly is led out from the wire hole, first enters the reverse locking limiting groove, then passes through the triangular opening, enters the main limiting groove, and is led out from the first notch. The triangular opening provides conditions for the external lead-out of the wire.

[0010] The housing is provided with an upper plate and a lower plate, the upper plate, the lower plate and the outer wall of the housing form a groove structure, a plurality of ribs connect the upper plate, a first notch is provided on the upper plate, and the first notch is connected to the groove structure. The wire led out of the first notch can be hidden in the groove structure and then led to a power supply device in a specific direction. In this way, the wires are neat and orderly to avoid clutter.

[0011] The lower plate is provided with a second notch, the opening end of the second notch is provided with a second blocking structure, and the second notch is arranged opposite to the first notch in vertical direction. The wire entering the groove structure can be led outward through the second notch, so that the wiring of the cooling fan is flexible.

[0012] The shell is cylindrical, the upper plate and the lower plate are square, connecting holes are provided at the four corners of the upper plate and the lower plate, a reinforcing plate is provided between the upper plate and the lower plate, the reinforcing plate is perpendicular to the upper plate and the lower plate, and the reinforcing plate is located at the four corners of the upper plate and the lower plate.

[0013] A hollow structure is provided at the connection between the rib and the shell, and the hollow structure is located at the end of the rib. The hollow structure can absorb the displacement or deformation of the rib, which may come from the stator assembly mounting plate. The design of the hollow structure is conducive to the stability of the stator assembly and the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of an EC axial flow fan;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a schematic diagram of the EC axial fan from another perspective;

[0018] Figure 4 for Figure 1 A top view of

[0019] Figure 5 for Figure 4 Middle BB section view.

[0020] Explanation of symbols in the figure:

[0021] 10. Shell; 101. Air inlet; 102. Air outlet; 103. Cavity; 11. Upper side plate; 12. Lower side plate; 13. Groove structure; 14. Second notch; 15. Second blocking structure; 16. Connection hole; 17. Reinforcement plate;

[0022] 20. Stator assembly installation plate;

[0023] 30. Rib; 31. Main limiting groove; 32. First notch; 33. First blocking structure; 34. Inverted limiting groove; 35. Triangular opening; 36. Hollow structure. DETAILED DESCRIPTION

[0024] Combination Figure 1 , Figure 5 An EC axial flow fan comprises a shell 10, a stator assembly and a rotor assembly, the shell is formed with a hollow cavity 103, an air inlet 101 and an air outlet 102 communicating with the hollow cavity and the outside, the air inlet and the air outlet are arranged correspondingly in front and behind, a stator assembly mounting plate 20 is arranged at the center of the air inlet, the stator assembly mounting plate is connected to the shell through a plurality of ribs 30, the stator assembly is fixedly assembled on the stator assembly mounting plate and is located in the cavity, the rotor assembly is rotatably assembled in the cavity and is electromagnetically coupled with the stator assembly, the air inlet and the air outlet are both trumpet-shaped, the axial depth of the trumpet-shaped air inlet is greater than the axial depth of the trumpet-shaped air outlet, and the side wall of the hollow cavity between the air inlet and the air outlet is a straight wall.

[0025] The rotor assembly rotates, and a low pressure area is formed in the hollow cavity 103, and the airflow outside the air inlet 101 flows into the hollow cavity 103 through the air inlet. Since the air inlet 101 is designed in a trumpet shape, compared with a straight-walled air inlet, the trumpet-shaped air inlet can inhale a wider range of airflow, thereby improving the heat dissipation efficiency of the cooling fan.

[0026] The air outlet 102 is in the shape of a trumpet. Under the action of the rotor assembly, the airflow in the hollow cavity 103 can be quickly discharged. Compared with the air outlet in the shape of a straight wall, the airflow discharge range is expanded, which is beneficial to improve the heat dissipation efficiency of the heat dissipation fan.

[0027] The axial depth of the trumpet-shaped air inlet 101 is greater than the axial depth of the trumpet-shaped air outlet 102. In this way, under the action of the rotor assembly, a low-pressure area as large as possible is formed in the hollow cavity 103, and a large amount of airflow on one side of the air inlet is sucked in to improve the heat dissipation efficiency of the cooling fan. The trumpet-shaped air inlet 101 is equivalent to chamfering the end edge of the hollow cavity 103. The chamfer includes two right-angled sides, and the length of the axial right-angled side represents the axial depth of the air inlet.

[0028] like Figure 1 , Figure 2 A wire limiting groove is provided on one of the plurality of ribs 30. The inner end of the wire limiting groove extends to the stator assembly mounting plate 20 and is connected to the wire hole on the stator assembly mounting plate. The outer end of the wire limiting groove extends to the edge of the housing 10 to form a first notch 32. The opening end of the first notch is provided with a first blocking structure 33. The wire connected to the stator assembly is led out from the wire hole, enters the wire limiting groove, passes through the air inlet 101, and is led out from the first notch 32. Since the wire limiting groove is directly provided on the rib 30, the wire embedded in the wire limiting groove will not enter the air inlet 101 of the axial flow fan and interfere with the rotor assembly. The first blocking structure 33 can prevent the wire in the first notch 32 from running out.

[0029] The wire limiting groove includes a main limiting groove 31 with an upward opening and a reverse locking groove 34 with a downward opening. A triangular opening 35 is provided at the junction of the reverse locking groove and the main limiting groove. The wire connected to the stator assembly is led out from the wire hole, first enters the reverse locking groove 34, then passes through the triangular opening 35, enters the main limiting groove 31, and is led out from the first notch 32. The triangular opening 35 provides conditions for the wire to be introduced from the reverse locking groove 34 into the main limiting groove 31.

[0030] The housing 10 is provided with an upper plate 11 and a lower plate 12. The upper plate, the lower plate and the outer wall of the housing 10 form a groove structure 13. A plurality of ribs connect the upper plate. A first notch 32 is provided on the upper plate. The first notch is connected to the groove structure. The wires led out of the first notch 32 can be hidden in the groove structure 13 and then led to a power supply device in a specific direction. In this way, the wires are neat and orderly to avoid clutter.

[0031] like Figure 1 The lower plate 12 is provided with a second notch 14, and the opening end of the second notch is provided with a second blocking structure 15, and the second notch is arranged opposite to the first notch 32. The wire entering the groove structure 13 can be led out through the second notch 14, so that the wiring of the cooling fan is flexible and adaptable to various installation and use scenarios.

[0032] The shell 10 is cylindrical, the upper plate 11 and the lower plate 12 are square, connecting holes 16 are provided at the four corners of the upper plate and the lower plate, and a reinforcing plate 17 is provided between the upper plate and the lower plate. The reinforcing plate is perpendicular to the upper plate and the lower plate and is located at the four corners of the upper plate and the lower plate.

[0033] A hollow structure 36 is provided at the connection between the rib 30 and the housing 10, and the hollow structure is located at the end of the rib. The hollow structure 36 can absorb the displacement or deformation of the rib 30, and the displacement or deformation of the rib may come from the stator assembly mounting plate. The design of the hollow structure is conducive to the stability of the stator assembly and the rotor assembly.

[0034] The above contents are only preferred implementation modes of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation mode and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. An EC axial flow fan, comprising a housing (10), a stator assembly and a rotor assembly, wherein the housing is formed with a hollow cavity (103), an air inlet (101) and an air outlet (102) communicating with the hollow cavity and the outside, the air inlet and the air outlet are arranged in front and back correspondence, a stator assembly mounting plate (20) is arranged at the center of the air inlet, the stator assembly mounting plate is connected to the housing through a plurality of ribs (30), the stator assembly is fixedly assembled on the stator assembly mounting plate and is located in the cavity, the rotor assembly is rotatably assembled in the cavity and is electromagnetically coupled with the stator assembly, and is characterized in that: The air inlet and the air outlet are both trumpet-shaped, the axial depth of the trumpet-shaped air inlet is greater than the axial depth of the trumpet-shaped air outlet, and the side wall of the hollow cavity between the air inlet and the air outlet is a straight wall.

2. The EC axial flow fan according to claim 1, characterized in that: A wire limiting groove is provided on one of the plurality of ribs (30), the inner end of the wire limiting groove extends to the stator assembly mounting plate (20) and is connected to the wire hole on the stator assembly mounting plate, the outer end of the wire limiting groove extends to the edge of the housing (10) to form a first notch (32), and the opening end of the first notch is provided with a first blocking structure (33).

3. The EC axial flow fan according to claim 2, characterized in that: The wire limiting groove comprises a main limiting groove (31) with an opening facing upwards, and a reverse locking limiting groove (34) with an opening facing downwards, and a triangular opening (35) is provided at the junction of the reverse locking limiting groove and the main limiting groove.

4. The EC axial flow fan according to claim 2, wherein: The shell (10) is provided with an upper plate (11) and a lower plate (12); the upper plate, the lower plate and the outer wall of the shell (10) form a groove structure (13); a plurality of ribs connect the upper plate; a first notch (32) is provided on the upper plate; the first notch is connected to the groove structure.

5. The EC axial flow fan according to claim 4, characterized in that: A second notch (14) is provided on the lower plate (12), a second blocking structure (15) is provided at the opening end of the second notch, and the second notch and the first notch (32) are arranged vertically opposite to each other.

6. The EC axial flow fan according to claim 4, characterized in that: The shell (10) is cylindrical, the upper plate (11) and the lower plate (12) are square, the four corners of the upper plate and the lower plate are provided with connecting holes (16), a reinforcing plate (17) is provided between the upper plate and the lower plate, the reinforcing plate is perpendicular to the upper plate and the lower plate, and the reinforcing plate is located at the four corners of the upper plate and the lower plate.

7. The EC axial flow fan according to claim 1, characterized in that: A hollow structure (36) is provided at the connection between the rib (30) and the shell (10), and the hollow structure is located at the end of the rib.

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