Inverted axial flow fan with high-reliability bracket mounting structure

Abstract

The utility model relates to the technical field of fan mesh enclosures, in particular to an inverted axial flow fan with a high-reliability support mounting structure, which comprises a mesh enclosure, a motor, an impeller and an air guide ring, the impeller is mounted on a motor shaft of the motor, the mesh enclosure is mounted on the air guide ring, the motor is mounted on the mesh enclosure, the motor shaft of the motor is positioned in the air guide ring, and the air guide ring is positioned in the air guide ring. A supporting part is installed on the mesh enclosure, one end of the supporting part is connected with the motor, the other end of the supporting part is connected with the air guide ring, the supporting part comprises two main ribs, the main ribs are flat steel, a supporting foot plate is welded to one ends of the two main ribs, the supporting foot plate comprises a T-shaped part and a square bottom plate, clamping grooves are symmetrically formed in the T-shaped part, notches are formed in the bottoms of the main ribs, and the square bottom plate is connected with the clamping grooves. The square bottom plate is located in the notch, the T-shaped part is located between the two main reinforcements, and by increasing the contact area and improving the strength of the welding position, the situation that the contact positions of the main reinforcements and the supporting foot plate are broken due to insufficient strength when a fan system is tested on a vibration table is avoided.

Description

Technical Field

[0001] This utility model relates to the field of fan guard technology, specifically an inverted axial flow fan with a highly reliable bracket mounting structure. Background Technology

[0002] In an inverted axial flow fan system, the motor is installed on the outlet side of the air duct with the motor shaft facing downwards. The main rib of the mesh cover supports the weight of the motor and impeller and is installed on the outlet plane of the air duct. A complete axial flow fan system includes a motor, bracket, impeller, air guide ring, and mesh cover. After being assembled into a complete fan system, one end of the main rib of the mesh cover is fixed to the motor, bearing the weight of the motor and impeller, while the other end is connected to the air duct. Therefore, the strength of the main rib of the mesh cover has a significant impact on the reliability of the fan system.

[0003] The existing wind turbine system has a circular double main rib on the top of the mesh cover. One end of the circular double main rib is connected to the motor. The top of the main rib is pressed with a rectangular pad and locked to the motor housing with bolts. However, the contact area between the circular double main rib, the rectangular pad and the motor housing is small and the weld is relatively narrow, which easily causes stress concentration. This results in insufficient strength of the wind turbine system. During vibration table testing, this connection is prone to breakage and failure. Utility Model Content

[0004] The purpose of this utility model is to provide an inverted axial flow fan with a highly reliable support mounting structure to solve the problems mentioned in the background art, ensure the reliability of the welding joints of the main ribs and the support plates, and improve the safety performance of the fan system.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An inverted axial flow fan with a highly reliable support mounting structure includes a screen, a motor, an impeller, and a guide ring. The impeller is mounted on the motor shaft, and the screen is mounted on the guide ring. The motor is mounted on the screen, with its motor shaft located inside the guide ring. A support portion is mounted on the screen, with one end connected to the motor and the other end connected to the guide ring. The support portion includes two main ribs, which are flat steel. A foot plate is welded to one end of each main rib, and the foot plate is connected to the motor. A connection hole is pre-drilled on the foot plate to facilitate installation with the motor.

[0007] As a further technical solution, the foot plate is an L-shaped plate, and the foot plate is welded to the two main reinforcing bars.

[0008] As a further technical solution, the ratio of the thickness of the support plate to the total weight of the motor, impeller, and mesh cover is 0.16 to 0.26.

[0009] As a further technical solution, the support plate includes a T-shaped part and a square base plate. The T-shaped part has symmetrical slots, the bottom of the main reinforcement has a notch, the square base plate is located in the notch, and the T-shaped part is located between the two main reinforcements.

[0010] As a further technical solution, two bottom welds are formed between the bottom of the square base plate and the main reinforcement, two top welds are formed between the top of the square base plate and the main reinforcement, and two top welds are formed between the slot and the main reinforcement.

[0011] As a further technical solution, the other ends of the two main reinforcing bars are connected to a connecting part, and the connecting part is symmetrically provided with a second connecting hole, which is located on the outside of the two main reinforcing bars.

[0012] As a further technical solution, the motor body is equipped with multiple extension plates, which are evenly installed in a circumferential direction. Limiting grooves are opened on the extension plates, and a square base plate is located in the limiting groove. A through hole is opened on the limiting groove, and the through hole and the connecting hole are coaxial.

[0013] As a further technical solution, two reinforcing ribs are installed at the top of the extension plate, and the two reinforcing ribs are symmetrically arranged on both sides of the limiting groove. A load-bearing block is installed at the bottom of the extension plate, and the through hole penetrates the load-bearing block.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] A support unit is installed on the mesh cover to bear the weight of the motor and impeller. One end of the support unit is connected to the motor, and the other end is connected to the air guide cover. The support unit includes a main rib, and a foot plate is welded to one end of the main rib. The main rib is set in the shape of flat steel, and the foot plate is set in the shape of L. At this time, when the main rib and the foot plate are welded, the contact area between them is increased, and there are a total of six welding positions, which improves the reliability of the welding position and avoids stress concentration at the connection. In addition, an extension plate, reinforcing ribs, and load-bearing block structure are set on the outside of the motor body to further strengthen the strength of the connection between the support unit and the motor. In the vibration table test, the fan system has high strength, and the connection between the two is not easy to break, thus improving the stability of the inverted axial flow fan system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the prior art structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 A magnified structural diagram of part A in the diagram;

[0018] Figure 3 This is a schematic diagram of the isometric structure of this utility model;

[0019] Figure 4 This is a utility model Figure 3 A schematic diagram of the enlarged structure of part B in the diagram;

[0020] Figure 5 This is an isometric structural diagram of the support part of this utility model;

[0021] Figure 6 This is a schematic diagram of the welding position of the support part of this utility model;

[0022] Figure 7 This is a utility model Figure 6 A schematic diagram of the enlarged structure of part C in the diagram;

[0023] Figure 8 This is an isometric structural diagram of the support plate of this utility model;

[0024] Figure 9 This is a partially enlarged structural diagram of the main rib of this utility model;

[0025] Figure 10 This is a schematic diagram of the motor shaft side structure of this utility model;

[0026] Figure 11 This is a schematic diagram of the motor structure from below, representing the present invention.

[0027] In the diagram: 1. Mesh cover; 2. Motor; 3. Air guide ring; 4. Bracket; 5. Rectangular gasket; 6. Threaded hole; 7. Support plate; 8. Main rib; 9. Connecting hole one; 10. Connecting hole two; 11. Connecting part; 12. Impeller; 13. Bottom weld; 14. Top weld; 15. Reinforcing rib; 16. Extension plate; 17. Limiting groove; 18. Load-bearing block; 19. T-shaped part; 20. Slot; 21. Square base plate; 22. Notch; 23. Through hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-2As is the existing technology, the inverted axial flow fan system includes a screen 1, a motor 2, an impeller 12, and a guide ring 3. A bracket 4 is installed on the screen 1. The bracket 4 is circular. One end of the bracket 4 is welded to the housing of the motor 2, and the other end is connected to the guide ring 3. A rectangular gasket 5 is provided at the connection end between the bracket 4 and the motor 2. The rectangular gasket 5 has a threaded hole 6 reserved so that one end of the circular bracket 4 can be fastened to the housing of the motor 2 by bolts. However, by welding the circular bracket 4 and the housing of the motor 2, the contact area between the two is small and the weld is relatively narrow, which is prone to stress concentration. During the vibration table test, the fan system is prone to breakage at the weld due to insufficient strength.

[0030] Please see Figure 3 In this embodiment of the present invention, an inverted axial flow fan with a highly reliable support mounting structure includes a mesh cover 1, a motor 2, and a guide ring 3. The mesh cover 1 is mounted on the guide ring 3, the motor 2 is mounted on the mesh cover 1, the motor shaft of the motor 2 is located inside the guide ring 3, and the impeller 12 is mounted on the motor shaft of the motor 2. A support part is mounted on the mesh cover 1. One end of the support part is connected to the motor 2, and the other end of the support part is connected to the guide ring 3. The motor 2 is fixed by one end of the support part, which bears the weight of the motor 2 and the impeller 12, and the other end is connected to the guide ring 3. The support part ensures the reliability of the inverted axial flow fan system.

[0031] Specifically, please refer to Figures 4-7 The support includes two main ribs 8, with a foot plate 7 welded to one end of each main rib 8. The main ribs 8 are flat steel, which increases the contact area between the main ribs 8 and the foot plate 7 to ensure the reliability of their connection. The foot plate 7 is connected to the motor 2, and a connection hole 9 is reserved on the foot plate 7 to facilitate the installation of the motor 2, so as to further fasten the foot plate 7 and the housing of the motor 2 with bolts. In addition, a connecting part 11 is connected to the other end of the main rib 8. A second connecting hole 10 is symmetrically opened on the connecting part 11. The second connecting hole 10 is located on the outside of the two main ribs 8, so as to fasten the other end of the main rib 8 to the air duct 3 with bolts.

[0032] Furthermore, please refer to Figures 8-9The support plate 7 is an L-shaped plate, welded to the two main reinforcing bars 8. The support plate 7 includes a T-shaped part 19 and a square base plate 21. The T-shaped part 19 has symmetrical slots 20, through which one end of the main reinforcing bar 8 passes. The bottom of the main reinforcing bar 8 has a notch 22, and the square base plate 21 is located within the notch 22. The slots 20 and the notch 22 restrict the position between the support plate 7 and the two main reinforcing bars 8, facilitating the fixing of their positions before welding and ensuring accurate welding. Specifically, the T-shaped part 19 is located between the two main reinforcing bars 8, and the bottom of the square base plate 21 forms a shape between the main reinforcing bars 8 and the base plate 21. Two bottom welds 13 are formed, two top welds 14 are formed between the top of the square base plate 21 and the main rib 8, and another two top welds 14 are formed between the slot 20 and the main rib 8. The main rib 8 is set as a flat steel, and the foot plate 7 is set as an L-shape. At this time, when the support part and the motor 2 housing are connected, there are a total of six connection positions between the foot plate 7 and the main rib 8. All six connection positions are connected by welding. At the same time, the contact area at the connection point increases and the number of welds increases, further ensuring the reliability of the welding and avoiding the phenomenon of breakage at the connection point.

[0033] In addition, please see Figures 10-11 To further ensure the reliability of the connection between the foot plate 7 and the motor 2, multiple extension plates 16 are installed on the body of the motor 2. The extension plates 16 are evenly installed in a circumferential direction, and limit grooves 17 are opened on the extension plates 16. The square base plate 21 is located in the limit groove 17, and through holes 23 are opened on the limit groove 17. The through holes 23 and the connecting hole 9 are coaxial. The square base plate 21 and the extension plates 16 are connected by bolts, that is, the connection between the foot plate 7 and the motor 2 is achieved by bolts. In order to further strengthen the strength of the connection, two reinforcing ribs 15 are installed at the top of the extension plate 16. The two reinforcing ribs 15 are symmetrically arranged on both sides of the limit groove 17. In addition, a load-bearing block 18 is installed at the bottom of the extension plate 16. The through holes 23 penetrate the load-bearing block 18, and the bolts used to connect the square base plate 21 and the extension plate 16 also pass through the load-bearing block 18. At this time, the strength of the connection between the foot plate 7 and the motor 2 is high and it is not easy to break.

[0034] As a preferred option, assuming the thickness of the support plate 7 is W mm, and the total weight of the motor 2 + impeller 12 + mesh cover 1 is M kg, then W / M≥0.16 and W / M≤0.26.

[0035] According to the experiment,

[0036] Maximum stress at the connection Percentage reduction in vibration value Original fan system 110MPa / This application's fan system 51MPa 53.6％

[0037] Therefore, the inverted axial flow fan system of this utility model increases the contact area between the support plate 7 and the main rib 8, i.e., increases the number of welds, and improves the support performance of the support part, so that it can stably bear the weight of the motor 2 and the impeller 12, further improving the stability of the fan system. The fan system of this utility model has strong vibration resistance and better reliability; and it is suitable for the field of rotating machinery, especially for outdoor unit fan systems containing air heat exchange devices such as heat pumps or air conditioners.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An inverted axial flow fan with a highly reliable support mounting structure, comprising a screen (1), a motor (2), an impeller (12), and a guide ring (3), wherein the impeller (12) is mounted on the motor shaft of the motor (2), and the screen (1) is mounted on the guide ring (3), characterized in that, The motor (2) is mounted on the mesh cover (1). The motor shaft of the motor (2) is located inside the air guide ring (3). A support part is installed on the mesh cover (1). One end of the support part is connected to the motor (2), and the other end of the support part is connected to the air guide ring (3). The support part includes two main ribs (8). The main ribs (8) are flat steel. A foot plate (7) is welded to one end of the two main ribs (8). The foot plate (7) is connected to the motor (2), and a connection hole (9) is reserved on the foot plate (7) to facilitate installation with the motor (2).

2. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 1, characterized in that, The foot plate (7) is an L-shaped plate, and the foot plate (7) is welded to the two main reinforcing bars (8).

3. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 2, characterized in that, The ratio of the thickness of the support plate (7) to the total weight of the motor (2), impeller (12), and mesh cover (1) is 0.16 to 0.

26.

4. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 3, characterized in that, The foot plate (7) includes a T-shaped part (19) and a square base plate (21). The T-shaped part (19) has symmetrical slots (20), and the bottom of the main reinforcement (8) has a notch (22). The square base plate (21) is located in the notch (22), and the T-shaped part (19) is located between the two main reinforcements (8).

5. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 4, characterized in that, Two bottom welds (13) are formed between the bottom of the square base plate (21) and the main reinforcement (8), two top welds (14) are formed between the top of the square base plate (21) and the main reinforcement (8), and two top welds (14) are formed between the slot (20) and the main reinforcement (8).

6. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 5, characterized in that, The other end of the two main reinforcing bars (8) is connected to a connecting part (11), and a second connecting hole (10) is symmetrically opened on the connecting part (11). The second connecting hole (10) is located outside the two main reinforcing bars (8).

7. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 4 or 6, characterized in that, Multiple extension plates (16) are installed on the body of the motor (2). The extension plates (16) are evenly installed in a circumferential direction. A limiting groove (17) is opened on the extension plate (16). A square base plate (21) is located in the limiting groove (17). A through hole (23) is opened on the limiting groove (17). The through hole (23) and the connecting hole (9) are coaxial.

8. The inverted axial flow fan with a high-reliability bracket mounting structure according to claim 7, characterized in that, The extension plate (16) has two reinforcing ribs (15) installed at the top. The two reinforcing ribs (15) are symmetrically arranged on both sides of the limiting groove (17). The extension plate (16) has a load-bearing block (18) installed at the bottom. The through hole (23) passes through the load-bearing block (18).

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