Efficient inner rotor axial flow fan

Abstract

The utility model relates to the field of ventilator equipment, and discloses a high-efficiency inner rotor axial flow fan, which comprises a flow guide device, an axial flow wind wheel, an adapter disc and an inner rotor motor, the axial flow wind wheel is arranged in the flow guide device and comprises a hub and axial flow blades, the inner side of the hub is provided with a mounting part, and the inner side of the hub is provided with the adapter disc. The outer side of the adapter plate is provided with a circumferential extension sheet which is cooperatively connected with the mounting part, the middle of the adapter plate is provided with a rotor hub, the inner rotor motor comprises a motor shaft, the rotor hub is cooperatively connected with the inner rotor motor, and the flow guide device comprises an outer ring, an inner ring and a plurality of flow guide blades arranged between the outer ring and the inner ring. Two ends of the guide vanes are respectively connected with the inner ring outer wall and the outer ring inner wall; the guide vanes are distributed between the outer ring and the inner ring in the circumferential direction. The axial flow fan has the advantages of stable airflow, low noise, good protection performance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilator equipment, in particular to a high-efficiency inner-rotor axial-flow fan. Background Art

[0002] In the technical field of ventilation equipment, axial-flow ventilators are a common type of equipment, and their main function is to generate air flow through rotating blades, thereby achieving air transportation and energy conversion.

[0003] Inner-rotor axial-flow fans have been popular in the fan market due to their diverse structures, good protection performance, and low noise. However, since the impellers of inner-rotor axial-flow fans mostly use flat metal blades or two-dimensional plastic blades, their aerodynamic efficiency is lower compared to outer-rotor fans with three-dimensional twisted blades.

[0004] The invention patent with the Chinese patent number CN118208429A discloses an inner-rotor axial-flow fan, including: a motor, a hub, and a plurality of blades. The hub is sleeved outside the motor shaft of the motor, the hub is key-connected to the motor shaft, and the blade root of the blade is connected to the outer edge of the hub through fasteners. The blade is arranged on the outer edge of the hub through fasteners, and the hub is key-connected to the motor shaft of the rotor. Compared with the existing double-sided welding connection between the blade and the rotor housing, the connection method is simple, convenient for assembly, and the deformation amount at the connection is small, facilitating the subsequent dynamic balance trimming process. At the same time, the connection quality and assembly efficiency of the blade and the rotor are improved. However, the inner-rotor axial-flow fan provided by this invention has unstable air flow, high fan noise, and poor product structure protection performance. Summary of the Utility Model

[0005] Aiming at the shortcomings in the prior art, the utility model provides a high-efficiency inner-rotor axial-flow fan with stable air flow, low noise, and good protection performance.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A high-efficiency inner-rotor axial-flow fan includes a guiding device, an axial-flow impeller, an adapter plate, and an inner-rotor motor. The axial-flow impeller is arranged in the guiding device. The axial-flow impeller includes a hub and axial-flow blades. An installation part is arranged inside the hub. A circumferentially extending piece that cooperates with the installation part is arranged outside the adapter plate. A rotor hub is arranged in the middle of the adapter plate. The inner-rotor motor includes a motor shaft, and the rotor hub is cooperatively connected with the inner-rotor motor. This structure can effectively improve the air flow stability of the fan, and the inner-rotor motor has good protection performance, high speed, large air volume, and low noise, which can enhance the adaptability of the axial-flow fan to the external environment.

[0008] Preferably, the guiding device includes an outer ring, an inner ring, and guiding blades arranged between the outer ring and the inner ring.

[0009] Preferably, there are multiple guide vanes, and both ends of the guide vanes are respectively connected to the outer wall of the inner ring and the inner wall of the outer ring; the guide vanes are circumferentially distributed between the outer ring and the inner ring. The addition of the guide vanes can effectively improve the airflow stability of the fan, thereby improving the fan efficiency and reducing the fan noise.

[0010] Preferably, the profile of the guide vane is a space curve. The guide vane with a space curve profile can further improve the aerodynamic efficiency of the fan and effectively increase the air volume of the fan.

[0011] Preferably, the outer ring includes an inlet section, an inlet flange, a straight section, a diffuser section, and an outlet flange, and the axial flow impeller is axially arranged in the inlet section and the straight section.

[0012] Preferably, the number of inner rings is N, N≥1, the number of guide vanes is Z, Z≥7, and the number of axial flow blades is K, K≥3.

[0013] Preferably, it further includes a mesh cover. The inner rotor motor further includes a motor housing. One end of the mesh cover is fixed to the motor housing, and the other end is fixed to the guide device. The mesh cover can provide good protection and support for the axial flow fan.

[0014] Preferably, the installation part includes a forward installation groove and a reverse installation groove, the forward installation groove and the reverse installation groove are arranged alternately, and the number of the forward installation groove and the reverse installation groove is the same as the number of the circumferentially extending pieces. This makes the connection between the axial flow impeller and the adapter plate more stable and enhances the airflow stability of the fan.

[0015] Preferably, the guide device or / and the axial flow impeller are integrally injection molded. This effectively improves the strength stability and protection performance of the product.

[0016] Preferably, the middle part of the adapter plate is a hollow structure. This can reduce the weight of the product and save costs.

[0017] The utility model designs an efficient inner rotor axial flow fan. By arranging the axial flow impeller in the guide device and then using the adapter plate to connect the inner rotor motor, the structure has good protection performance and stability, a large air volume, can effectively improve the efficiency of the inner rotor fan, reduce the fan noise, and enhance the adaptability of the axial flow fan to the external environment; and by adding guide vanes with a space curve profile, the airflow stability of the fan is effectively improved, further improving the fan efficiency and reducing the fan noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structure diagram of the utility model.

[0019] Figure 2 is an exploded structure diagram of the utility model.

[0020] Figure 3This is a cross-sectional view of the present utility model.

[0021] Figure 4 This is a schematic diagram of the adapter plate of the present utility model.

[0022] Figure 5 This is a schematic diagram of the axial flow wind wheel of the present utility model.

[0023] The technical names of the reference numerals in the figure are: 1 - flow guiding device, 11 - outer ring, 12 - inner ring, 13 - flow guiding vanes, 111 - inlet section, 112 - inlet flange, 113 - straight section, 114 - diffuser section, 115 - outlet flange, 2 - axial flow wind wheel, 21 - axial flow vanes, 22 - hub, 211 - forward installation groove, 212 - reverse installation groove, 3 - adapter plate, 31 - circumferentially extending piece, 32 - rotor hub, 4 - inner rotor motor, 41 - motor shaft, 42 - motor housing, 5 - mesh cover. Detailed implementation manners

[0024] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Embodiment 1

[0026] An efficient inner rotor axial flow fan includes a flow guiding device 1, an axial flow wind wheel 2, an adapter plate 3 and an inner rotor motor 4. The axial flow wind wheel 2 is arranged inside the flow guiding device 1. The axial flow wind wheel 2 includes a hub 22 and axial flow vanes 21 arranged along its circumferential direction. An installation part is arranged inside the hub 22. Circumferentially extending pieces 31 which are cooperatively connected with the installation part are arranged outside the adapter plate 3. The circumferentially extending pieces 31 are fixedly connected with the axial flow wind wheel 2 through the installation part. A rotor hub 32 is arranged in the middle of the adapter plate 3. The inner rotor motor 4 includes a motor shaft 41. The adapter plate 3 is fixedly connected with the inner rotor motor 4 through the rotor hub 32. This structure can effectively improve the air flow stability of the fan, and the inner rotor motor 4 has good protection performance, high speed, large air volume and low noise, and can enhance the adaptability of the axial flow fan to the external environment.

[0027] The flow guiding device 1 includes an outer ring 11, an inner ring 12 and flow guiding vanes 13 arranged between the outer ring 11 and the inner ring 12.

[0028] There are multiple flow guiding vanes 13. Two ends of the flow guiding vanes 13 are respectively connected with the outer wall of the inner ring 12 and the inner wall of the outer ring 11; the flow guiding vanes 13 are distributed in a circumferential direction between the outer ring 11 and the inner ring 12. The addition of the flow guiding vanes 13 can effectively improve the air flow stability of the fan, thereby improving the fan efficiency and reducing the fan noise.

[0029] The profile of the guide vane 13 is a space curve. The specific profile design is determined according to the flow field application conditions and the structural dimensions of each component of the fan are also considered. The guide vane 13 with a space curve profile can further improve the aerodynamic efficiency of the fan and effectively increase the air volume of the fan.

[0030] The outer ring 11 includes an inlet section 111, an inlet flange 112, a straight section 113, a diffuser section 114, and an outlet flange 115. The axial flow impeller 2 is axially located between the inlet section 111 and the straight section 113, and the inlet section 111 is trumpet-shaped.

[0031] The number of inner rings 12 is 1, the number of guide vanes 13 is 12, and the number of axial flow blades 21 is 5.

[0032] It further includes a mesh cover 5. The inner rotor motor 4 also includes a motor housing 42. One end of the mesh cover 5 is fixed to the motor housing 42, and the other end is fixed to the guide device 1. The mesh cover 5 can provide good protection and support for the axial flow fan.

[0033] Specifically, the trumpet-shaped inlet section 111 of the outer ring 11 is provided with an inlet flange 112. The inlet flange 112 is provided with mounting holes for fixing to the installation platform. The axial flow impeller 2 is axially located between the inlet section 111 and the straight section 113. The guide vane 13 is located in the diffuser section 114. The outlet of the diffuser section 114 is provided with an outlet flange 115. The outlet flange 115 is provided with mounting holes for fixing to the mesh cover 5. The mesh cover 5 includes an intermediate support disk and an outer support disk. The intermediate support disk is connected to the motor housing 42, and the outer support disk is fixed to the outlet flange 115.

[0034] The installation part includes a forward installation groove 211 and a reverse installation groove 212. The forward installation groove 211 and the reverse installation groove 212 are arranged alternately. The number of the forward installation groove 211 and the reverse installation groove 212 is the same as the number of the circumferential extension pieces 31. The number of both the forward installation groove 211 and the reverse installation groove 212 is 7. Both the forward installation groove 211 and the reverse installation groove 212 are fixedly connected to the circumferential extension pieces 31 of the adapter plate 3. This makes the connection between the axial flow impeller 2 and the adapter plate 3 more stable and enhances the air flow stability of the fan.

[0035] Both the guide device 1 and the axial flow impeller 2 are integrally injection-molded. This effectively improves the strength stability and protection performance of the product.

[0036] When using this fan, the air flow enters the inlet section 111 and the straight section 113 through the axial flow impeller 2, passes through the diffuser section 114, is guided by the guide vane 13, and is then discharged through the outlet flange 115.

[0037] Embodiment 2

[0038] Based on Embodiment 1, the middle part of the adapter plate 3 is a hollow structure, which can reduce the weight of the product and save costs.

[0039] Embodiment 3

[0040] The difference from Embodiment 1 is that the number of inner rings 12 is 1, the number of guide vanes 13 is 7, and the number of axial flow vanes 21 is 3.

[0041] The above-described embodiments are only a preferred solution of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A high-efficiency inner rotor axial flow fan, characterized in that: The invention comprises a flow guide device (1), an axial flow wind wheel (2), an adapter plate (3) and an inner rotor motor (4); the axial flow wind wheel (2) is arranged in the flow guide device (1); the axial flow wind wheel (2) comprises a wheel hub (22) and axial flow blades (21); a mounting portion is arranged on the inner side of the wheel hub (22); a circumferential extension piece (31) which is matched and connected with the mounting portion is arranged on the outer side of the adapter plate (3); a rotor hub (32) is arranged in the middle of the adapter plate (3); the inner rotor motor (4) comprises a motor shaft (41); and the rotor hub (32) is matched and connected with the inner rotor motor (4).

2. A high-efficiency inner rotor axial flow fan according to claim 1, characterized in that: The flow guide device (1) comprises an outer ring (11), an inner ring (12), and flow guide blades (13) arranged between the outer ring (11) and the inner ring (12).

3. A high-efficiency inner rotor axial flow fan according to claim 2, characterized in that: There are a plurality of guide blades (13), and two ends of the guide blades (13) are respectively connected to the outer wall of the inner ring (12) and the inner wall of the outer ring (11); the guide blades (13) are distributed in a circumferential direction between the outer ring (11) and the inner ring (12).

4. A high-efficiency inner rotor axial flow fan according to claim 3, characterized in that: The profile of the guide vane (13) is a space curve.

5. The high-efficiency inner rotor axial flow fan according to claim 2, characterized in that: The outer ring (11) comprises an inlet section (111), an inlet flange (112), a straight section (113), a diffuser section (114) and an outlet flange (115), and the axial flow impeller (2) is axially arranged between the inlet section (111) and the straight section (113).

6. A high-efficiency inner rotor axial flow fan according to claim 2, characterized in that: The number of the inner rings (12) is N, N≥1, the number of the guide blades (13) is Z, Z≥7, and the number of the axial flow blades (21) is K, K≥3.

7. The high-efficiency inner rotor axial flow fan according to claim 1, characterized in that: It also includes a mesh cover (5), and the inner rotor motor (4) also includes a motor housing (42). One end of the mesh cover (5) is fixed to the motor housing (42), and the other end is fixed to the flow guide device (1).

8. The high-efficiency inner rotor axial flow fan according to claim 1, characterized in that: The mounting portion comprises a forward mounting groove (211) and a reverse mounting groove (212), the forward mounting groove (211) and the reverse mounting groove (212) are arranged alternately, and the number of the forward mounting groove (211) and the reverse mounting groove (212) is the same as the number of the circumferential extension pieces (31).

9. The high-efficiency inner rotor axial flow fan according to claim 1, characterized in that: The flow guide device (1) and / or the axial flow wind wheel (2) are integrally injection molded.

10. The high-efficiency inner rotor axial flow fan according to claim 1, characterized in that: The middle part of the transfer plate (3) is a hollow structure.

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